Huawei Technologies R250D-E Remote Unit User Manual Hardware Installation and Maintenance Guide

Huawei Technologies Co.,Ltd Remote Unit Hardware Installation and Maintenance Guide

Contents

User Manual

R250D-EHardware Installation andMaintenance GuideIssue 01Date 2016-09-30HUAWEI TECHNOLOGIES CO., LTD.
Copyright © Huawei Technologies Co., Ltd. 2016. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.All other trademarks and trade names mentioned in this document are the property of their respectiveholders. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. All or part of the products, services and features described in this document may not be within thepurchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees orrepresentations of any kind, either express or implied.The information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute a warranty of any kind, express or implied. Huawei Technologies Co., Ltd.Address: Huawei Industrial BaseBantian, LonggangShenzhen 518129People's Republic of ChinaWebsite: http://www.huawei.comEmail: support@huawei.comIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.i
About This DocumentIntended AudienceThis document describes hardware features of the R250D-E and provides basic installationmethods.This document is intended for:lNetwork planning engineerslHardware installation engineerslCommissioning engineerslOnsite maintenance engineerslSystem maintenance engineersSymbol ConventionsThe symbols that may be found in this document are defined as follows.Symbol DescriptionIndicates an imminently hazardous situationwhich, if not avoided, will result in death orserious injury.Indicates a potentially hazardous situationwhich, if not avoided, could result in deathor serious injury.Indicates a potentially hazardous situationwhich, if not avoided, may result in minoror moderate injury.Indicates a potentially hazardous situationwhich, if not avoided, could result inequipment damage, data loss, performancedeterioration, or unanticipated results.NOTICE is used to address practices notrelated to personal injury.R250D-EHardware Installation and Maintenance Guide About This DocumentIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.ii
Symbol DescriptionNOTECalls attention to important information,best practices and tips.NOTE is used to address information notrelated to personal injury, equipmentdamage, and environment deterioration. Change HistoryChanges between document issues are cumulative. The latest document issue contains allchanges made in previous issues.Issue 01 (2016-09-30)Initial commercial releaseR250D-EHardware Installation and Maintenance Guide About This DocumentIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.iii
ContentsAbout This Document.....................................................................................................................ii1 Product Overview..........................................................................................................................11.1 Device Structure............................................................................................................................................................. 21.2 Indicator Description...................................................................................................................................................... 31.3 Basic Specifications........................................................................................................................................................51.4 Ordering Information......................................................................................................................................................62 AP Installation............................................................................................................................... 72.1 Preparing for Installation................................................................................................................................................ 82.2 Installation Flowchart..................................................................................................................................................... 92.3 Unpacking the Equipment............................................................................................................................................ 102.4 Determining the Installation Position........................................................................................................................... 102.5 Installing the Device..................................................................................................................................................... 112.5.1 Installing the Device into an 86-Type Box................................................................................................................ 112.5.2 Installing the Device on a Desk.................................................................................................................................132.6 Cable Connection......................................................................................................................................................... 132.7 Checking the Device After Installation........................................................................................................................ 152.8 Powering on the Device................................................................................................................................................153 Logging In to the Device............................................................................................................ 163.1 Logging In to the Device Using STelnet/Telnet........................................................................................................... 174 Hardware Failures....................................................................................................................... 184.1 A Device Fails to Be Powered On................................................................................................................................195 Appendix.......................................................................................................................................215.1 On-site Cable Assembly and Installation..................................................................................................................... 225.1.1 Cable Assembly Precautions..................................................................................................................................... 225.1.2 Assembling Power Cables......................................................................................................................................... 235.1.3 Assembling Ethernet Cables......................................................................................................................................315.1.4 Installing Cable Accessories......................................................................................................................................455.1.5 Replacing the Mold of the Crimping Tool.................................................................................................................615.2 Environmental Requirements for Device Operation.................................................................................................... 645.2.1 Environmental Requirements for an Equipment Room............................................................................................ 645.2.2 Requirements for Power Supply................................................................................................................................72R250D-EHardware Installation and Maintenance Guide ContentsIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.iv
5.3 Equipment Grounding Specifications...........................................................................................................................755.3.1 General Grounding Specifications.............................................................................................................................755.3.2 Grounding Specifications for an Equipment Room.................................................................................................. 755.3.3 Grounding Specifications for Devices.......................................................................................................................755.3.4 Grounding Specifications for Communications Power Supply.................................................................................765.3.5 Grounding Specifications for Signal Cables............................................................................................................. 775.3.6 Specifications for Laying Out Grounding Cables..................................................................................................... 775.4 Engineering Labels for Cables..................................................................................................................................... 785.4.1 Introduction to Labels................................................................................................................................................785.4.2 Engineering Labels for Optical Fibers.......................................................................................................................865.4.3 Engineering Labels for Network Cables................................................................................................................... 895.4.4 Engineering Labels for User Cables..........................................................................................................................905.4.5 Engineering Labels for Power Cables....................................................................................................................... 915.5 Guide to Using Optical Modules.................................................................................................................................. 945.6 Fault Tag....................................................................................................................................................................... 975.7 Installation Checklist.................................................................................................................................................... 98R250D-EHardware Installation and Maintenance Guide ContentsIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.v
1 Product OverviewAbout This ChapterThe R250D-E in Huawei Agile Distributed Wi-Fi Solution is applicable to scenarios withhigh-density rooms and complex wall structures, such as schools, hotels, hospitals, and officemeeting rooms. Huawei R250D-E uses an 86 mm plate in compliance with internationalstandards and can be easily installed into an 86–type box in a room. It is equipped with abuilt-in antenna and a hidden indicator; therefore, installation of the R250D-E does not affectindoor decorations or designs. It also has an IEEE 802.11a/b/g/n/ac/ac Wave 2 wirelessmodule and can work on both 5 GHz and 2.4 GHz frequency bands. It supports PoE powersupply, and can be directly connected to a central AP and deployed in a room. The central APand the R250D-E are connected through network cables, which greatly extends the coveragerange, enhances flexibility in AP deployment and planning, and reduces the engineeringconstruction costs.1.1 Device Structure1.2 Indicator Description1.3 Basic Specifications1.4 Ordering InformationR250D-EHardware Installation and Maintenance Guide 1 Product OverviewIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.1
1.1 Device StructureFigure 1-1 shows the appearance of the R250D-E.Figure 1-1 Appearance of the R250D-E1 2 3 6 75Pass ThroughGE0/PoE_IN4Table 1-1 describes ports on the R250D-E.Table 1-1 Interface descriptionNo. Name Description1 DC 48V DC power socket: connects a 48 V power adapter to thedevice.2 USB Connects to a USB flash drive or other storage devices toextend the storage space of the device. The USB2.0standard is supported.3 Default Reset button: restores factory settings and restarts thedevice if you hold down the button more than 3 seconds.4 Pass Through Pass Through port: connects to a network cable or phonecable for transparent transmission.5 GE2 to GE4 10/100/1000M port: connects to the wired Ethernet.6 GE1/PoE_OUT10/100/1000M port: connects to the wired Ethernet andsupports PoE output.7 GE0/PoE_IN 10/100/1000M port: connects to the wired Ethernet andsupports PoE input. R250D-EHardware Installation and Maintenance Guide 1 Product OverviewIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.2
NOTElThe R250D-E supports the following power supply modes: PoE power supply and DC powersupply.lWhen the device uses the DC power supply, use a power adapter for power supply; otherwise, thedevice may be damaged.1.2 Indicator DescriptionLED IndicatorThe R250D-E provides only a single indicator, as shown in Figure 1-2.Figure 1-2 IndicatorGE1/PoE_OUT GE2 GE3 Pass ThroughGE4IndicatorNOTElThe indicator is located inside the panel, which turns on after the AP is powered on.lIndicator colors may vary slightly at different temperature.Table 1-2 Indicator descriptionType Color Status DescriptionDefault status afterpower-onGreen Steady on The AP is justpowered on and thesoftware is notstarted yet.R250D-EHardware Installation and Maintenance Guide 1 Product OverviewIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.3
Type Color Status DescriptionSoftware startupstatusGreen Steady on afterblinking onceAfter the system isreset and startsuploading thesoftware, theindicator blinksgreen once. Until thesoftware is uploadedand started, theindicator remainssteady green.Running status Green Blinking once every2s (0.5 Hz)The system isrunning properly, theEthernet connectionis normal, and STAsare associated withthe AP.Blinking once every5s (0.2 Hz)The system isrunning properly, theEthernet connectionis normal, and noSTA is associatedwith the AP. Thesystem is in lowpower consumptionstate.Alarm Green Blinking onceAlarm Green every0.25s (4 Hz)lThe software isbeing upgraded.lAfter thesoftware isuploaded andstarted, the APworking in FitAP moderequests to goonline on the ACand maintainsthis state until itgoes onlinesuccessfully onthe AC (beforethe CAPWAPlink isestablished).lThe APregistration fails(the CAPWAPlink isdisconnected).R250D-EHardware Installation and Maintenance Guide 1 Product OverviewIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.4
Type Color Status DescriptionFault Red Steady on A fault that affectsservices hasoccurred, such as aDRAM detectionfailure or systemsoftware loadingfailure. The faultcannot beautomaticallyrectified and must berectified manually. 1.3 Basic SpecificationsTable 1-3 provides basic specifications of the R250D-E.Table 1-3 Basic specificationsItem DescriptionPhysicalspecificationsDimensions (H xW x D)36mm x 86mm x 140mmWeight 0.26kgSystem memory l256MB DDR3Ll32MB FLASHPowerspecificationsPower input lDC:48V±5%lPoE power supply: in compliance with IEEE802.3af/atMaximum powerconsumption11.5 W (excluding the output power of the USB portand PoE_OUT port)NOTEThe actual maximum power consumption depends on locallaws and regulations.EnvironmentspecificationsOperatingtemperaturel-60 m to +1800 m: 0°C to +40°Cl1800 m to 5000 m: Temperature decreases by 1°Cevery time the altitude increases 300 m.Storagetemperature-40°C to +70°COperatinghumidity5% to 95% (non-condensing)IP rating IP20R250D-EHardware Installation and Maintenance Guide 1 Product OverviewIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.5
Item DescriptionAtmosphericpressure53 kPa to 106 kPa 1.4 Ordering InformationTo place an order, contact technical support personnel.Part Number Description50082922 R250D-E Mainframe(11ac,2x2 DoubleFrequency,Built-in Antenna)R250D-EHardware Installation and Maintenance Guide 1 Product OverviewIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.6
2 AP InstallationAbout This Chapter2.1 Preparing for Installation2.2 Installation Flowchart2.3 Unpacking the Equipment2.4 Determining the Installation Position2.5 Installing the Device2.6 Cable Connection2.7 Checking the Device After Installation2.8 Powering on the DeviceR250D-EHardware Installation and Maintenance Guide 2 AP InstallationIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.7
2.1 Preparing for InstallationThis section describes safety precautions and tool preparations for AP installation.Safety PrecautionslTake proper measures to prevent injuries and device damage.lPlace the device in a dry and flat position away from any liquid and prevent the devicefrom slipping.lKeep the device clean.lDo not put the device and tools in the aisles.CAUTIONOnly the qualified personnel are permitted to install and remove the device and itsaccessories. Before installation and operation, read the safety precautions carefully.Tool PreparationTo install APs, prepare tools listed in Table 2-1.Table 2-1 ToolsPhillips screwdriver Protective gloves ESD glovesSlip-proof glove Marker Hammer drillClaw hammer Diagonal pliers Wire stripperR250D-EHardware Installation and Maintenance Guide 2 AP InstallationIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.8
RJ45 crimping tool Cable cutter Network cable testerMultimeter Ladder Safety helmetSafety belt Anti-skid shoes - 2.2 Installation FlowchartThe following figure shows the process for installing an AP.R250D-EHardware Installation and Maintenance Guide 2 AP InstallationIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.9
Figure 2-1 Installation flowchart2.3 Unpacking the EquipmentBefore unpacking the carton, ensure that the packing carton is intact and not damaged orsoaked. Stop unpacking if the equipment is rusted or soggy. Then, investigate causes andcontact the supplier.After unpacking, check items in the carton against the packing list. If any item is missing,contact the supplier or agent.Usually, the packing list contains the following items.lRemote UnitlScrewslQuick Start GuidelWarranty cardlMAC address labellSN labelNOTEIf a PoE adapter or a DC power adapter is required, you need to purchase it separately.2.4 Determining the Installation PositionlDo not deploy the device in places with high temperature, dust, noxious gas, unstablevoltage, much vibrations, or strong noise, or in places near flammable or explosivematerials and interference sources such as a large radar station, radio station, andtransformer station.R250D-EHardware Installation and Maintenance Guide 2 AP InstallationIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.10
lInstall the device in a site that is free from leaking or dripping water, heavy dew, andhumidity, and take protective measures to prevent water from flowing into the equipmentalong the cable.lPlace the AP far away from electronic devices that may produce radio interference, suchas microwave ovens, antennas, and other radio communication devices. For details, seeTable 2-2.lInstall the device in hidden places and ensure that the device does not disturb daily workand life of residents.lMake the engineering design by fully considering such factors as hydrology, geology,earthquake, electric power, and traffic. The selected site should comply with theenvironment design specifications of communications equipment.Table 2-2 General anti-interference requirementsScenario Deployment Distance RequirementIndoorinstallationlThere should be at least a 7 m distance between antennas.lThe antennas should be placed at least 2 m from the 4G antennas ofthe carrier.lThe antennas should be placed far away from electronic devices thatmay produce interference, such as microwave ovens. NOTEIf antennas are embedded into APs, the deployment distance requirements on the antennas are those on APs.2.5 Installing the DeviceNOTERemove the protective film on the surface before installation to prevent electrostatic discharge.2.5.1 Installing the Device into an 86-Type BoxInstalling the device in an 86-type box requires expansion screws delivered with the device.The procedure is as follows:1. Use a screwdriver to remove the 86-type panel from the wall (skip this step if no 86-typepanel is installed on the wall).R250D-EHardware Installation and Maintenance Guide 2 AP InstallationIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.11
2. Insert a network cable into the GE0/PoE_IN port and a phone cable into the PassThrough port.GE1/PoE_OUTPass Through3. Connect the cables. For details, see 2.6 Cable Connection.4. Open the front cover of the device, align screws on both sides with the screw holes in the86-type box, and use the Phillips screwdriver to tighten the two screws. 1N•mM4GE1/PoE_OUT GE2 GE3 Pass ThroughGE45. Close the cover. If torx security screws are used to prevent theft, use a T9 torx securityscrewdriver to tighten the torx security screws into the device.GE1/PoE_OUT GE2 GE3 Pass ThroughGE40.16N•mST2.5GE1/PoE_OUTGE2 GE3 Pass ThroughGE4NOTEYou need to separately prepare the T9 torx security screwdriver.R250D-EHardware Installation and Maintenance Guide 2 AP InstallationIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.12
2.5.2 Installing the Device on a DeskInstalling an AP on a desk requires a desktop stand. The procedures are as follows:1. Connect the cables. For details, see 2.6 Cable Connection.2. Align the top of the desktop stand with the grooves on the bottom cover of the AP. Slidethe AP along the rail until the stand reaches the end of the grooves. Place the stand withthe AP on the desk steadily.NOTEYou need to separately purchase a desktop stand.2.6 Cable ConnectionTable 2-3 describes the cable connections.Figure 2-2 Appearance of the R250D-E1 2 3 54Pass ThroughGE0/PoE_INR250D-EHardware Installation and Maintenance Guide 2 AP InstallationIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.13
Table 2-3 Cable connectionsNo. Cable or Device Description1 DC power adapter When the device uses the DC power supply, use a poweradapter for power supply; otherwise, the device may bedamaged.2 USB cable Connects to a USB flash drive or other storage devices toextend the storage space of the device. The USB portsupports the USB 2.0 standard and a maximum outputpower of 2.5 W.3 Phone cable orNetwork cableThe cable is inserted into a Pass Through port fortransparent transmission.4 Network cable lConnects to STAs through downlink network ports.lCAT5e cables or higher must be used.lThe length of a network cable cannot exceed 100 m.However, when the GE1/PoE_OUT port is used forPoE output, the network cable inserted in this portcannot be longer than 20 m.lThe GE1/PoE_OUT port supports PoE output andprovides a maximum of 10 W power output.NOTICElThe GE1/PoE_OUT port complies with the categorydetection mechanism of 802.3af.lDo not insert a PoE input cable into the GE1/PoE_OUT port.5 Network cable lConnects to the Ethernet port of an upper-layer PSEthrough the uplink network port.lThe GE0/PoE_IN port supports PoE input.lCAT5e cables or higher must be used.lThe length of a network cable cannot exceed 100 m. NOTElIf the R250D-E needs to connect to the Ethernet, ensure that the Ethernet cable is working properly.If the Ethernet cable is not working properly, the R250D-E may fail to be powered on or fail towork. Before connecting an Ethernet cable to the R250D-E, use the cable test tool to check whetherthe cable is qualified. If the cable is unqualified, replace it.lThe R250D-E is powered by either the DC power supply or PoE power supply.lWhen the R250D-E works in 802.3af power supply mode, the USB port and PoE_OUT port have nopower output; when it works in 802.3at or DC power supply mode, the USB port and PoE_OUT porthave power output.Pay attention to the following points when bundling the cables:lDifferent types of cables must be separately routed with the minimum spacing of 30 mmand cannot be entangled or crossed. Cables should be parallel or separated usingdedicated separators.R250D-EHardware Installation and Maintenance Guide 2 AP InstallationIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.14
lBundled cables are closely arranged, straight, tidy, and undamaged.lCable ties are bound neatly facing the same direction, and those at the same horizontalline must be in a straight line. Cable tie tails should be cut smoothly and evenly.lLabels or nameplates must be attached to the cables after they are installed.2.7 Checking the Device After InstallationTable 2-4 shows the items to be checked after installation is complete. For more details, seeInstallation Checklist in the appendix.Table 2-4 Installation checklistNo. Check Item1 The device is installed by strictly following the design draft. Theinstallation position meets space requirements, with maintenance spacereserved.2 The device is securely installed.3 The power cables are intact and not spliced.4 Terminals of the power cables are welded or cramped firmly.5 All power cables are not short-circuited or reversely connected and mustbe intact with no damage.6 The power cables and ground cables are separated from other cables andbundled separately.7 Connectors of signal cables are complete, intact, and tightly connected.The signal cables are not damaged or broken.8 Labels on cables are clear and correct. 2.8 Powering on the DeviceAfter the device is powered on, observe indicator on the device to determine the systemrunning status. For details, see 1.2 Indicator Description.NOTEDo not frequently power on and off the device.R250D-EHardware Installation and Maintenance Guide 2 AP InstallationIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.15
3 Logging In to the DeviceAbout This Chapter3.1 Logging In to the Device Using STelnet/TelnetR250D-EHardware Installation and Maintenance Guide 3 Logging In to the DeviceIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.16
3.1 Logging In to the Device Using STelnet/TelnetYou can log in to the device using STelnet V2 or Telnet to configure, manage, and maintainthe device in the CLI.NOTElBy default, only the STelnet V2 service is enabled on the device.lTelnet has security vulnerabilities. You are not advised to enable the Telnet service.Before logging in to the device, complete the following tasks:lPower on the device.lPrepare network cables used to connect device interfaces.The following table lists the default configuration of the device. You are advised to change thedefault user name and password on your first login.Table 3-1 Default configuration of the deviceParameter Default SettingUser name adminPassword admin@huawei.comIP address 169.254.1.1Subnet mask 255.255.0.0 NOTEIf the device is already online on the AC, you can remotely log in to the AC on a local terminal and run thedisplay ap all command to check the IP address of the device.The following example uses the default parameters and is used for reference only.Step 1 Use network cables and a LAN switch to connect the PC to the network interface of thedevice.Step 2 Assign the PC with an IP address on the same network segment as the default IP address ofthe device so that the PC and device are reachable to each other.If the device uses the default settings, the IP address of the PC must be in the networksegment 169.254.0.0/16 but cannot be 169.254.1.1. 169.254.1.100 is recommended.Step 3 Start the CLI on the PC and access the IP address 169.254.1.1 of the device using STelnet V2.Step 4 Enter the user name and password as prompted to log in to the user interface.----EndR250D-EHardware Installation and Maintenance Guide 3 Logging In to the DeviceIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.17
4 Hardware FailuresAbout This ChapterThis section describes common methods for troubleshooting typical hardware faults.4.1 A Device Fails to Be Powered OnR250D-EHardware Installation and Maintenance Guide 4 Hardware FailuresIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.18
4.1 A Device Fails to Be Powered OnFault DescriptionThe SYS indicator of a device is off.Possible CausesPower Supply Mode Possible CausePower supply using a power module lThe device is powered off.lThe power cable is not securelyconnected to the device.lThe power supply unit has failed.–If the device connects to an externalpower source, its power adapter mayfail.–If the device has a built-in powersupply, the device itself may befaulty.PoE power supply lThe power sourcing equipment does notsupport the PoE function or is faulty.lThe power sourcing equipment isincorrectly configured (the PoE functionis disabled or the power-off time range isimproperly set).lThe line is faulty (the network cable ordistribution frame is damaged).lThe device is faulty. R250D-EHardware Installation and Maintenance Guide 4 Hardware FailuresIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.19
Troubleshooting ProcedurePower Supply Mode Troubleshooting ProcedurePower supply using a power module 1. Check whether the device is poweredoff.2. Check that the power cable is securelyconnected to the device.3. Check whether the power supply isnormal.Replace the power adapter with a normalone. If the device is powered on, theoriginal power adapter is faulty. Contacttechnical support personnel or Huaweiagent and ask them to replace the poweradapter.4. If the device still cannot be powered on,the device itself is faulty. Contacttechnical support personnel or Huaweiagent and ask them to replace the device.PoE power supply 1. Check whether the power sourcingequipment supports PoE or is faulty.2. Check whether the configuration on thepower sourcing equipment causes PoEpower supply errors, such as the PoEfunction is disabled or the power-offtime range is incorrectly set.3. Check whether the network cable ordistribution frame is faulty.4. If the device still cannot be powered on,the device itself is faulty. Contacttechnical support personnel or Huaweiagent and ask them to replace the device.R250D-EHardware Installation and Maintenance Guide 4 Hardware FailuresIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.20
5 AppendixAbout This Chapter5.1 On-site Cable Assembly and Installation5.2 Environmental Requirements for Device Operation5.3 Equipment Grounding Specifications5.4 Engineering Labels for Cables5.5 Guide to Using Optical Modules5.6 Fault Tag5.7 Installation ChecklistR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.21
5.1 On-site Cable Assembly and Installation5.1.1 Cable Assembly PrecautionsChecking the Appearance of CableslIf the cable jacket or insulation is visibly dirty, clean it before assembly.lIf the jacket or insulation of a cable has visible damage, irreparable scuffing, or otherdefects, do not use the cable.lIf the shield layer of a cable is damaged, do not use the cable.lIf the cable jacket or insulation cracks after the cable is bent or twisted, discard this cableand check whether other cables have the same problem. If other cables have the sameproblem, replace these cables.Checking the Appearance of ConnectorslDo not use connectors with visible defects, damage, rust or scuffing.lDo not use connectors if their shells or pins have exposed part or uneven plating, or theirpins are lost, broken, or bent.lDo not use connectors that have dirt on their pins or in their jacks or if there areconductors between pins or between pins and the shell.Precautions for AssemblylUse dedicated tools or tools delivered by Huawei and follow the methods given hereduring assembly.lHold terminals of cables instead of pulling the cables themselves when installing orremoving cable components.lTake the following precautions when cutting or stripping cables:–Make cables slightly longer than necessary.–Coil cables longer than 2 m (6.56 ft) after cutting. Bind and fasten the coils usingbundling ropes. The inner diameters of the coils should be larger than 20 times theouter diameters of the cables.–When stripping the jackets of cables, avoid damaging the shield layers (braid oraluminum foil), insulation, core conductors, and other jackets that do not need to bestripped.–After assembling cables, cut all visible cross sections of jackets to ensure that thecross sections are arranged neatly.–Do not touch the core conductors of cables with your hands. Terminate exposedconductors in a timely way after stripping off insulation so that the surface of theconductors does not become oxidized.lTake the following precautions when crimping and connecting cables or connectors:–The terminals and conductors should be connected tightly after they are crimped.They should not be moved or turned.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.22
–Cut all the exposed copper wires.–Try to avoid a second crimping of sleeves.–Keep all the conductors clean and aligned.NOTEThe connectors, cables, and tools provided by different vendors may be different. The figures in thisdocument are for your reference only.5.1.2 Assembling Power CablesAssembling the OT Terminal and Power CableContextFigure 5-1 shows the components of an OT terminal and a power cable.Figure 5-1 Components of an OT terminal and a power cableA. Heat-shrinkable tubing B. Bare crimping terminal C. Insulation D. Conductor ProcedureStep 1 Based on the cross-sectional area of the cable conductor, strip a length of insulation coating Cto expose the conductor D of length L1, as shown in Figure 5-2. The recommended values ofL1 are listed in Table 5-1.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.23
Figure 5-2 Stripping a power cable (OT terminal) NOTICElWhen you strip a power cable, do not damage the conductor of the cable.lIf the bare crimping terminal is not provided by Huawei, the value of L1 is 1 mm (0.04 in.)to 2 mm (0.08 in.) greater than the value of L.Table 5-1 Mapping between the cross-sectional area of the conductor and the value of L1Cross-SectionalArea ofConductor(mm2(in.2))Value of L1(mm(in.))Cross-SectionalArea of Conductor(mm2(in.2))Value of L1(mm(in.))1 (0.002) 7 (0.28) 10 (0.015) 11 (0.43)1.5 (0.002) 7 (0.28) 16 (0.025) 13 (0.51)2.5 (0.004) 7 (0.28) 25 (0.039) 14 (0.55)4 (0.006) 8 (0.31) 35 (0.054) 16 (0.63)6 (0.009) 9 (0.35) 50 (0.077) 16 (0.63) NOTEIf you are proficient in assembling OT terminals and power cables, you can obtain the value of L1 bycomparing the part to be crimped with the power cable.Step 2 Put the heat-shrinkable (A) tubing onto the bare crimping terminal, as shown in Figure 5-3.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.24
Figure 5-3 Putting the heat shrink tubing onto the bare crimping terminal Step 3 Put the OT terminal B onto the exposed conductor, and ensure that the OT terminal is in goodcontact with the insulation coating C, as shown in Figure 5-3.NOTICEAfter the conductor is fed into the OT terminal, the protruding part of the conductor, or L2 inFigure 5-3, must not be longer than 2 mm (0.08 in.).Step 4 Crimp the joint parts of the bare crimping terminal and the conductor, as shown in Figure 5-4.NOTEThe shapes of crimped parts may vary with the crimping dies.Figure 5-4 Crimping the joint parts of the bare crimping terminal and the conductor (OTterminal) Step 5 Push the heat shrink tubing (A) toward the connector until the tube covers the crimped part,and then use a heat gun to heat the tube, as shown in Figure 5-5.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.25
Figure 5-5 Heating the heat shrink tubing (OT terminal) NOTICEStop heating the shrink tubing when the connector is securely locked in the shrink tubing. Donot heat the shrink tubing too long as this may damage the insulation coating.----EndAssembling the JG Terminal and Power CableContextFigure 5-6 shows the components of a JG terminal and a power cable.Figure 5-6 Components of a JG terminal and a power cableA. JG terminal B. Heat-shrinkable tubing C. Insulation layer of a powercableD. Conductor of a power cable R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.26
ProcedureStep 1 Strip a part of the insulation to expose the cable conductor with a length of L, as shown inFigure 5-7. The recommended values of L are listed in Table 5-2.NOTICElWhen you strip a power cable, do not damage the conductor of the cable.lIf the bare crimping terminal is not provided by Huawei, you can adjust the value of L asrequired.Figure 5-7 Stripping a power cable (JG terminal) Table 5-2 Mapping between the cross-sectional area of the conductor and the value of LCross-Sectional Area of Conductor(mm2(in.2))Value of L (mm(in.))16 (0.025) 13 (0.51)25 (0.039) 14 (0.55)35 (0.054) 16 (0.63)50 (0.077) 16 (0.63) Step 2 Put the heat shrink tubing onto the bare crimping terminal, as shown in Figure 5-8.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.27
Figure 5-8 Putting the heat shrink tubing onto the bare crimping terminal Step 3 Put the bare crimping terminal onto the exposed conductor, and ensure that the bare crimpingterminal is in good contact with the insulation of the power cable, as shown in Figure 5-8.Step 4 Crimp the joint parts of the bare crimping terminal and the conductor, as shown in Figure 5-9.Figure 5-9 Crimping the joint parts of the bare crimping terminal and the conductor (JGterminal) Step 5 Push the heat shrink tubing toward the connector until the tube covers the crimped part, andthen use a heat gun to heat the tube, as shown in Figure 5-10.Figure 5-10 Heating the heat shrink tubing (JG terminal)R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.28
----EndAssembling the Cord End Terminal and the Power CableContextFigure 5-11 shows the components of a cord end terminal and a power cable.Figure 5-11 Components of a cord end terminal and a power cableA. Cord end terminal B. Insulation layer of a power cable C. Conductor of a power cable ProcedureStep 1 Strip a part of the insulation to expose the cable conductor with a length of L1, as shown inFigure 5-12. The recommended values of L1 are listed in Table 5-3.NOTICEWhen you strip a power cable, do not damage the conductor of the cable.Figure 5-12 Stripping a power cable (cord end terminal)R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.29
Table 5-3 Mapping between the cross-sectional area of the conductor and the value of L1Cross-SectionalArea ofConductor(mm2(in.2))Value of L1(mm(in.))Cross-SectionalArea of Conductor(mm2(in.2))Value of L1(mm(in.))1 (0.002) 8 (0.31) 10 (0.015) 15 (0.59)1.5 (0.002) 10 (0.39) 16 (0.025) 15 (0.59)2.5 (0.004) 10 (0.39) 25 (0.039) 18 (0.71)4 (0.006) 12 (0.47) 35 (0.054) 19 (0.75)6 (0.009) 14 (0.55) 50 (0.077) 26 (1.02) Step 2 Put the cord end terminal onto the conductor, and ensure that the conductor is aligned with theedge of the cord end terminal, as shown in Figure 5-13.NOTICEAfter the conductor is fed into the cord end terminal, the protruding part of the conductormust not be longer than 1 mm (0.04 in.).Figure 5-13 Putting the cord end terminal onto the conductor Step 3 Crimp the joint parts of the cord end terminal and the conductor, as shown in Figure 5-14.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.30
Figure 5-14 Crimping the cord end terminal and the conductor Step 4 Check the maximum width of the tubular crimped terminal. The maximum width of a tubularcrimped terminal is listed in Table 5-4.Table 5-4 Maximum width of a tubular crimped terminalCross-Sectional Area of TubularTerminal (mm2(in.2))Maximum Width of Crimped TerminalW1 (mm(in.))0.25 (0.0004) 1 (0.04)0.5 (0.0008) 1 (0.04)1.0 (0.0015) 1.5 (0.06)1.5 (0.0023) 1.5 (0.06)2.5 (0.0039) 2.4 (0.09)4 (0.006) 3.1 (0.12)6 (0.009) 4 (0.16)10 (0.015) 5.3 (0.21)16 (0.025) 6 (0.24)25 (0.039) 8.7 (0.34)35 (0.054) 10 (0.39) ----End5.1.3 Assembling Ethernet CablesAssembling the Shielded RJ45 Connector and Ethernet CableR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.31
ContextFigure 5-15 shows the components of an RJ45 connector and a shielded Ethernet cable.Figure 5-15 Shielded RJ45 connector and cableA. Jacket of connector B. Metal shell of connector C. Wire holder ofconnectorD. Plug of connectorE. Jacket of Ethernet cable F. Shield layer of EthernetcableG. Twisted-pair wires - ProcedureStep 1 Fit the jacket of the connector onto the Ethernet cable, as shown in Figure 5-16.Figure 5-16 Fitting the jacket of the connector onto the Ethernet cable Step 2 Remove a 30 mm (1.18 in.) long section of the jacket, cut off the nylon twine inside thejacket, and cut a no more than 5 mm (0.20 in.) cleft in the jacket, as shown in Figure 5-17.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.32
NOTICElWhen you remove a section of the jacket, do not damage the shield layer of the twisted-pair cable.lWhen you remove the shield layer, do not damage the insulation of the twisted-pair cable.Figure 5-17 Removing the jacket of a twisted-pair cable (unit: mm (in.)) Step 3 Fit the metal shell onto the twisted-pair cable. The shield layer is covered by the metal shell,as shown in Figure 5-18.Figure 5-18 Fitting the metal shell onto the twisted-pair cable Step 4 Fit the metal shell onto the twisted-pair cable until the shield layer is covered completely.Along the edge of the metal shell, cut off the aluminum foil shield layer and ensure that thereis no surplus copper wire. The exposed twisted-pair cable is about 20 mm (0.79 in.) long, asshown in Figure 5-19.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.33
Figure 5-19 Removing the shield layer of a twisted-pair cable (unit: mm (in.)) Step 5 Lead the four pairs of twisted-pair wires through the wire holder, as shown in Figure 5-20 andFigure 5-21. Ensure that the colored wires are in the correct location in the cable.Figure 5-20 Leading wires through the wire holderCG Figure 5-21 Cable locations in a wire holderWhite-GreenGreenWhite-OrangeOrangeBlueWhite-BlueWhite-BrownBrown Step 6 Align the four pairs of cables in the holder, as shown in Figure 5-22. The connectionsbetween the wires and the pins are shown in Figure 5-23 and listed in Table 5-5.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.34
Figure 5-22 Four pairs of cables on a wire holder Figure 5-23 Connections between wires and pinsBrownWhite -BrownGreenWhite-BlueBlueWhite-GreenOrangeWhite-OrangePin 8Pin 1 Table 5-5 Connections between wires and pins (using a straight-through cable as an example)Matching Pins of Wires Wire Color1 White-Orange2 Orange3 White-Green4 Blue5 White-Blue6 Green7 White-BrownR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.35
Matching Pins of Wires Wire Color8 Brown Step 7 Cut off the surplus cables along the lower edge of the wire holder, as shown in Figure 5-24.Figure 5-24 Cutting off surplus cables Step 8 Put the connector body onto the wire holder and turn the metal shell by 90°, as shown inFigure 5-25.NOTEEnsure that the wire holder is in good contact with the connector body.Figure 5-25 Putting the connector body onto the wire holder Step 9 Push the metal shell toward the connector body until the wire holder and the connector bodyare engaged completely. Crimp the connector, as shown in Figure 5-26.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.36
Figure 5-26 Crimping the connector Step 10 Push the jacket towards the metal shell until the metal shell is covered. This completes theassembly of one end of the cable, as shown in Figure 5-27.Figure 5-27 Pushing the metal shell Step 11 To complete the assembly of the other end, repeat Step 1 through Step 10.----EndAssembling an Unshielded RJ45 Connector and Ethernet CableContextFigure 5-28 shows the components of an unshielded RJ45 connector and cable.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.37
Figure 5-28 Components of an unshielded RJ45 connector and cableABCA. Plug of connector B. Jacket C. Twisted-pair wires ProcedureStep 1 Remove a 16-mm (0.63 in.) long section of the jacket, as shown in Figure 5-29.NOTICEWhen you remove the shield layer, do not damage the insulation of the twisted-pair cable.Figure 5-29 Removing the jacket of a twisted-pair cable (unit: mm (in.)) Step 2 Align the four pairs of wires and cut the ends neatly, as shown in Figure 5-30. Theconnections between the wires and the pins are listed in Table 5-6.Figure 5-30 Connections between wires and pins (unit: mm (in.))C16White-OrangeWhite-GreenOrangeBlueWhite-BlueGreenWhite-BrownBrownPin 8Pin 1R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.38
Table 5-6 Connections between wires and pins (using a straight-through cable as an example)Matching Pins of Wires Wire Color1 White-Orange2 Orange3 White-Green4 Blue5 White-Blue6 Green7 White-Brown8 Brown Step 3 Feed the cable into the plug, and crimp the connector, as shown in Figure 5-31.NOTEWhen inserting the cable, check from the side or bore of the plug to ensure that the cable is completelyseated in the plug.Figure 5-31 Crimping the connector Step 4 To complete the assembly of the other end, repeat Step 1 through Step 3.----EndChecking the Appearance of Contact StripsContextlTo ensure proper contact between the crimped wires and the wire conductors, the heightsand sizes of the contact strips must be standard and the same.lThe contact strips must be parallel to each other, with an offset of less than ± 5°. The topmargin of a strip must be parallel to the axis of the connector, with an offset of less than± 10°.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.39
lTo ensure conductivity, the surface of the contact strips must be clean.lThe contact strips must be in good contact with the RJ45 socket. The plastic separatorsmust remain intact and be aligned.lThe contact strip blade must extend beyond the ends of the wires. The ends of the wiresmust be in contact with the edge of the RJ45. The distance between them must be lessthan 0.5 mm (0.02 in.).ProcedureStep 1 Hold the crimped connector, with the front side facing you, and check whether the contactstrips are of the same height. The height should be 6.02 ± 0.13 mm (0.237 ± 0.005). If ameasuring tool is not available, you can compare the connector with a standard connector.Figure 5-32 shows an unqualified piece, and Figure 5-33 shows a qualified piece.NOTEAll unqualified pieces must be crimped again.Figure 5-32 Contact strips of different heights Figure 5-33 Contact strips of the same height Step 2 Hold an RJ45 connector and turn it 45°. Observe the top edges of the metal contact strips.Figure 5-34 shows an unqualified piece.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.40
Figure 5-34 Unparallel contact strips of different heights Step 3 Check whether the contact strips are clean. If they are not clean and the dirt cannot beremoved, replace it with a new RJ45 connector. Figure 5-35 shows an unqualified piece.Figure 5-35 Dirt on a contract strip Step 4 Check whether the contact strips and the plastic separators are well aligned and intact. If aseparator is skewed and cannot be fixed, replace it with a new RJ45 connector. Figure 5-36shows an unqualified piece.Figure 5-36 Skewed plastic separators Step 5 Hold the connector with the side facing towards you, and check whether you can see thecross-sections of the wires. Ensure that the ends of the wires are in good contact with the edgeR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.41
of the RJ45, and that the contact strip blade extends beyond the ends of the wires and iscrimped with the wires. If not, replace the connector. Figure 5-37 shows an unqualified piece.Figure 5-37 Wires not in good contact with the edge of the RJ45 ----EndTesting the Connection of Assembled CablesContextHuawei provides two types of Ethernet cables: straight-through cables and crossover cables.lStraight-through cables are connected in a one-to-one manner. They are used to connectterminals such as a computer or switch to network devices. Table 5-7 lists theconnections of core wires in a straight-through cable.Table 5-7 Connections of core wires in a straight-through cableRJ45 Connector 1 RJ45 Connector 2 Core Wire Color Twisted or Not2 2 Orange Twisted1 1 Orange-White6 6 Green Twisted3 3 Green-White4 4 Blue Twisted5 5 Blue-White8 8 Brown Twisted7 7 Brown-White lCrossover cables are connected in a crossover manner. They are used to connectterminals such as two computers or switches. Table 5-8 lists the connections of corewires in a crossover cable.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.42
Table 5-8 Connections of core wires in a straight crossover cableRJ45 Connector 1 RJ45 Connector 2 Core Wire Color Twisted or Not6 2 Orange Twisted3 1 Orange-White2 6 Green Twisted1 3 Green-White4 4 Blue Twisted5 5 Blue-White8 8 Brown Twisted7 7 Brown-White Figure 5-38 shows the pins of an RJ45 connector.Figure 5-38 Pins of an RJ45 connectorPin8Pin1 ProcedureStep 1 Feed both connectors of the cable into the ports of the cable tester.Step 2 After the connectors are properly inserted, turn on the tester. If the indicators from 1 to G turnon simultaneously, you can infer that the pins work normally and the wires are correctlyconnected.NOTETurn the switch to the S position to slow down lighting of the indicators so that you can see theindicators more clearly, as shown in Figure 5-39.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.43
Figure 5-39 Testing the conduction and connections of wires Step 3 Gently shake the connector and repeat Step 2 to check whether the metal contact strips are ingood contact with the core wires and Ethernet ports, as shown in Figure 5-40.Figure 5-40 Checking the reliability The procedure for testing a crossover cable is the same as that for testing a straight-throughcable except for the sequence in which the indicators turn on, which depends on the wireconnections of a crossover cable.The Ethernet cable is qualified if the indicators turn on in the following sequence:At the master (left) section of the tester, the indicators turn on in the sequence of 1-8-G. At theslave (right) section of the tester, the indicators turn on in the sequence of 3-6-1-4-5-2-7-8-G.If the indicators do not come on in this sequence, the Ethernet cable is unqualified.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.44
NOTEIf a tester is not available, you can use a multimeter to perform a simple test, as shown in Figure 5-41.Figure 5-41 Testing the connection of an Ethernet cable ----End5.1.4 Installing Cable AccessoriesPrecautions for Installing Cable AccessoriesToolsNOTEThe illustrations in this document may differ from actual situations, but the installation methods are thesame. For example, in this document, the adapters of cable connectors have separate interfaces. In theactual situation, the adapters may have interfaces fixed on equipment.Use dedicated tools provided or specified by Huawei and follow the installation proceduredescribed here.Bending RadiusUnless otherwise specified, bending radius (R) of cables or fibers must meet the requirementslisted in Table 5-9.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.45
Table 5-9 Bending radius of cables or fibersCable or Fiber Bending Radius (R)Ordinary cable In normal cases, R ≥ 2d. When the cable isconnected with a connector, R ≥ 5d.Fiber R ≥ 40 mm (1.57 in.); Bending angle > 90° NOTEThe letter d indicates the diameter of a cable or fiber.Precautions for InstallationlHold terminals of cables instead of pulling the cables themselves when installing orremoving cable components.lDo not insert a connector forcibly when the connector is blocked. Use a dedicated tool topull out the connector. Install the connector again after you check that the pins areinserted properly.lBefore tightening screws on cable connectors, ensure that the connectors are properlyconnected to their adapters. Tighten the screw with appropriate force using a flat-head orPhillips screwdriver instead of bare hands or an electric screwdriver. If the screw cannotbe screwed into the tapped hole, determine the reason and try again. Do not apply toomuch force, or the screw or adapter may be damaged.lWhen removing densely aligned cables or fiber connectors, use dedicated pliers such ascable-pulling pliers and fiber-pulling pliers.lDo not twist, bend, stretch, or extrude fibers during installation.lCover the idle fiber connectors with dust caps. Remove the dust caps before using thefiber connectors.Requirements for Cable RoutinglTo protect cables, remove the burrs in the cable through-holes or install protective ringsin the holes.lTo ease the connection and to avoid stress, keep cable joints slack. After connectingmultiple cables to a connector that has multiple interfaces, keep the cables slack to avoidgenerating stress.lBind or clean cables gently because cable distortion affects signal quality.lKeep cables away from moveable components such as doors.lSharp objects must not touch cable wiring to prevent damage to cables.lTo protect power cables, route power cables of the active and standby power modulesseparately.Installing Power AdaptersInstalling the OT TerminalR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.46
ProcedurelInstall an OT terminal.a. Align the hole of the OT terminal (conductor upward) with a connecting hole, asshown in Figure 5-42.Figure 5-42 Aligning the OT terminal with a connecting hole NOTEWhen you install an OT terminal, the crimping sleeve is installed as shown in Figure 5-43,where A is correct and B is incorrect.Figure 5-43 Installing an OT terminal, showing the orientation of crimping sleeve b. Place the spring washer and flat washer in turn, mount a matching screw, and fastenit clockwise, as shown in Figure 5-44.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.47
Figure 5-44 Installing two terminals back to back NOTICEEnsure that the OT terminal is not in contact with other terminals or metalcomponents.c. Move the cable slightly and ensure that it is securely connected, as shown in Figure5-45.Figure 5-45 Installed OT terminal lInstall two OT terminals on a post.Before you install two OT terminals on a post, ensure that the two terminals can beinstalled on the post and that the electrical connecting pieces have a large contact area.Two OT terminals can be installed using any of these methods:–Bend the upper OT terminal at a 45- or 90-degree angle, as shown in Figure 5-46.–Cross the two terminals, as shown in Figure 5-47.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.48
Figure 5-46 Bending the upper OT terminal at a 45- or 90-degree angle Figure 5-47 Crossing two terminals NOTICEIf the two terminals are different sizes, place the smaller one above the bigger one. Amaximum of two terminals can be installed on a post.lTo remove an OT terminal, loosen the screw counterclockwise.----EndInstalling the Cord End TerminalProcedureStep 1 Hold a cord end terminal upright and place it on a terminal jack, as shown in Figure 5-48. Toensure bump contact and dense connection, place the plain side of the terminal outwards.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.49
Figure 5-48 Placing a terminal on a terminal jack vertically Step 2 Insert the terminal into the jack vertically, and turn the screw clockwise to fasten the terminal,as shown in Figure 5-49.Figure 5-49 Feeding the terminal into the jack NOTICElEnsure that the exposed section of the terminal is less than 2 mm (0.079 in.) in length.lDo not press the insulation of the terminal.lInsert only one terminal into one jack.Step 3 Move the cable slightly and ensure that it is securely connected.Step 4 Before you remove a cord end terminal, loosen the screw counterclockwise.----EndInstalling Ethernet AdaptersR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.50
Installing a Shielded Ethernet ConnectorProcedureStep 1 Hold the male and female connectors, with the male connector facing the female connector, asshown in Figure 5-50.Figure 5-50 Holding the male and female shielded connectors Step 2 Insert the male connector into the female connector, as shown in Figure 5-51.Figure 5-51 Feeding the male shielded connector into the female shielded connector Step 3 When you hear a click, the cable connector is completely inserted in the port. (The clip on thecable connector pops up to fix the connector in the port.) Pull the connector slightly andensure that it is securely connected, as shown in Figure 5-52.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.51
Figure 5-52 Installed shielded Ethernet connector Step 4 To remove an Ethernet connector, press the locking key and pull out the connector, as shownin Figure 5-53.Figure 5-53 Removing a shielded Ethernet connector ----EndInstalling an Unshielded Ethernet ConnectorProcedureStep 1 Hold the male and female connectors, with the male connector facing the female connector, asshown in Figure 5-54.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.52
Figure 5-54 Holding the male and female unshielded connectors Step 2 Feed the male connector into the female connector, as shown in Figure 5-55.Figure 5-55 Feeding the male connector into the female unshielded connector Step 3 A crisp click indicates that the connector is locked by the locking key. Pull the connectorslightly and ensure that it is securely connected. Figure 5-56 shows an installed Ethernetconnector.Figure 5-56 Installed unshielded Ethernet connectorR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.53
Step 4 To remove an Ethernet connector, press the locking key and pull out the connector, as shownin Figure 5-57.Figure 5-57 Removing an unshielded Ethernet connector ----EndInstalling Fiber ConnectorsContextNOTICElAfter you remove the dustproof cap, ensure that the fiber pins are clean and install them assoon as possible.lWhen you disassemble fiber connectors, you must use a dedicated tool if the connectorsare densely installed.Cleaning Fiber ConnectorsProcedureStep 1 Clean the pins of a fiber connector by using lint-free cotton and alcohol.Step 2 Clean the pins again by using dust-free cotton. If necessary, clean the pins by using an air gun.Ensure that the pins are free from any fiber or debris.----EndInstalling an FC Fiber ConnectorR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.54
ProcedureStep 1 Remove the dustproof cap of the FC connector and store it for future use.Step 2 Align the core pin of the male connector with that of the female connector, as shown inFigure 5-58.Figure 5-58 Aligning the male connector with the female connector Step 3 Align the male connector with the female connector and gently push the male connector untilit is completely seated in the female connector, as shown in Figure 5-59.Figure 5-59 Feeding the male connector into the female connector Step 4 Fasten the locking nut clockwise and ensure that the connector is securely installed, as shownin Figure 5-60.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.55
Figure 5-60 Fastening the locking nut Step 5 To disassemble an FC fiber connector, loosen the locking nut counterclockwise, and gentlypull the male connector, as shown in Figure 5-61.Figure 5-61 Disassembling an FC fiber connector ----EndInstalling an LC Fiber ConnectorProcedureStep 1 Remove the dustproof cap of the LC fiber connector and store it for future use.Step 2 Align the core pin of the male connector with that of the female connector, as shown inFigure 5-62.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.56
Figure 5-62 Aligning the male connector with the female connector Step 3 Align the male connector with the fiber adapter and gently push the male connector until it iscompletely seated in the fiber connector, as shown in Figure 5-63.Figure 5-63 Feeding the male connector into the female connector Step 4 A clicking sound indicates that the male connector is locked, as shown in Figure 5-64.Figure 5-64 Installed LC connector R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.57
Step 5 To disassemble an LC fiber connector, press the locking nut to release the locking clips fromthe bore, and gently pull the male connector, as shown in Figure 5-65.Figure 5-65 Disassembling an LC fiber connector ----EndInstalling the SC Fiber ConnectorProcedureStep 1 Remove the dustproof cap of the SC fiber connector and store it for future use.Step 2 Align the core pin of the male connector with that of the female connector, as shown inFigure 5-66.Figure 5-66 Aligning the male connector with the female connector Step 3 Feed the fiber connector into the female connector, with your fingers holding the shell of thefiber connector (not the pigtail). When you hear a click, the fiber connector is secured by theclips (internal parts, not illustrated in the figure). Pull the fiber connector gently. If theconnector does not loosen, the installation is complete. See Figure 5-67.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.58
Figure 5-67 Installed SC fiber connector Step 4 To disassemble an SC fiber connector, hold the shell of the connector (do not hold the fiber)and gently pull the connector in the direction vertical to the adapter. Unlock the maleconnector, and then separate it from the shell, as shown in Figure 5-68.Figure 5-68 Disassembling an SC fiber connector ----EndInstalling an MPO ConnectorProcedureStep 1 Remove the dustproof cap of the MPO fiber connector and store it for future use.Step 2 Align the core pin of the male connector with that of the female connector, as shown inFigure 5-69.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.59
Figure 5-69 Aligning the male connector with the female connector Step 3 Hold the shell labeled "PUSH" and feed the male connector into the female connector untilyou hear a clicking sound. The male and female connectors are securely installed, as shown inFigure 5-70.Figure 5-70 Installed MPO fiber connector Step 4 To disassemble an MPO fiber connector, hold the shell labeled "PULL" and remove the maleconnector, as shown in Figure 5-71.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.60
Figure 5-71 Disassembling an MPO fiber connector ----End5.1.5 Replacing the Mold of the Crimping ToolProcedureStep 1 Hold the handles of a pair of COAX crimping tools. Loosen the two fastening screwscounterclockwise, as shown in Figure 5-72.Figure 5-72 Loosening two fastening screws Step 2 Hold the handles of the COAX crimping tools to open the self-locking mechanism. The jawof the COAX crimping tools opens automatically, as shown in Figure 5-73.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.61
Figure 5-73 Pliers jaw opening automatically Step 3 Remove the mold from the COAX crimping tools, as shown in Figure 5-74.Figure 5-74 Removing the mold from the COAX crimping tools Step 4 Place the mold to be installed into the jaw of the COAX crimping tools and align the screwholes, as shown in Figure 5-75.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.62
Figure 5-75 Installing a new mold in the COAX crimping tool NOTICEKeep the short side of the mold inwards and the long side outwards, with the teeth of the moldaligning from the larger size to the smaller size.Step 5 Hold the handles of the COAX crimping tools tightly to match the mold and the jawcompletely. Align the screw holes, as shown in Figure 5-76.Figure 5-76 Aligning the screw holes Step 6 Hold the handles of the COAX crimping tools with one hand. Tighten the two fasteningscrews clockwise. Figure 5-77 and Figure 5-78shows the mold installed in the COAXcrimping tool.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.63
Figure 5-77 Mold installed in the COAX crimping tool Figure 5-78 An installed mold ----End5.2 Environmental Requirements for Device Operation5.2.1 Environmental Requirements for an Equipment RoomRequirements for Selecting a Site for an Equipment RoomWhen designing a project, consider the communication network planning and technicalrequirements of the equipment. Also consider hydrographic, geological, seismic, powersupply, and transportation factors.Construction, structure, heating and ventilation, power supply, lighting and fire-proofconstruction of the equipment room should be designed by specialized construction designersto suit the environmental requirements of devices. The equipment room should also followlocal regulations concerning the industrial construction, environmental protection, fire safety,and civil air defense. Construction must conform to government standards, regulations, andother requirements.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.64
The equipment room should be located in a place free from high temperature, dust, toxicgases, explosive materials, or unstable voltage. Keep the equipment room away fromsignificant vibrations or loud noises, as well as power transformer stations.The specific requirements for selecting a site for an equipment room are as follows:lThe room should be located at a distance of at least 5 km (3.11 mi.) from heavy pollutionsources such as smelting and coal mines. It should be located at a distance of at least 3.7km (2.30 mi.) from moderate pollution sources such as chemical, rubber, andgalvanization factories. It should be located at a distance of at least 2 km (1.24 mi.) fromlight pollution sources such as packinghouses and tanyards. If these pollution sourcescannot be avoided, ensure that the equipment room is upwind of the pollution sources. Inaddition, use a high-quality equipment room or protection products.lThe room should be located away from livestock farms, or be upwind of the livestockfarms. Do not use an old livestock room or fertilizer warehouse as the equipment room.lThe equipment room must be far away from residential areas. An equipment room that isnot far away from residential areas must comply with equipment room constructionstandards to avoid noise pollution.lThe room should be located far away from industrial and heating boilers.lThe room should be at least 3.7 km (2.30 mi.) away from the seaside or salt lake.Otherwise, the equipment room should be airtight with cooling facilities. In addition,alkalized soil cannot be used as the construction material. Otherwise, equipment suitablefor wet conditions must be used.lThe doors and windows of the equipment room must be kept closed to maintain anairtight room.lUsing steel doors to ensure sound insulation is recommended.lNo cracks or openings are allowed on the walls or floors. The outlet holes on the walls orwindows must be sealed. Walls must be constructed such that they are smooth, wear-resistant, dustproof, flame retardant, sound insulated, heat absorptive, and haveelectromagnetic shielding.lThe air vent of the room should be far from the exhaust of city waste pipes, big cesspoolsand sewage treatment tanks. The room should be in the positive pressure state to preventcorrosive gases from entering the equipment room and corroding components and circuitboards.lIt is recommended that the room be on or above the second floor. If this requirementcannot be met, the ground for equipment installation in the room should be at least 600mm (23.62 in,) above the maximum flood level.lThe equipment room should be strong enough to resist winds and downpours.lThe room should be located away from dusty roads or sand. If this is unavoidable, thedoors and windows of the equipment room must not face pollution sources.lDo not place air conditioning vents near the equipment so that they blow directly on theequipment because condensation may be blown into the equipment.lDo not use decorative materials that contain sulfur in the equipment room.Equipment Room LayoutAn equipment room usually contains mobile switching equipment, telecommunicationsequipment, power supply equipment, and other auxiliary equipment. To ensure easymaintenance and management, place the equipment in different rooms. Figure 5-79 shows thelayout of the equipment room.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.65
Figure 5-79 Layout of the equipment roomControl room Generator roomTransmissionroomMain communicationequipment roomPower distributionroom Battery roomSubstation room Communication cable and optical cablePower cable The general layout principles of the equipment room are as follows:lIt should meet requirements for laying out and maintaining communication cables andpower cables.lIt should reduce the cabling distance, which facilitates cable maintenance, reducespotential communication faults, and maximizes efficiency.Construction Requirements for the Equipment RoomTable 5-10 describes the construction requirements for the equipment room.Table 5-10 Construction requirements for the equipment roomItem RequirementsArea The smallest area of the equipment room can accommodate theequipment with the largest capacity.Net height The minimum height of the equipment room should not be less than 3 m(9.84 ft). The minimum height of the equipment room is the net heightbelow overhead beams or ventilation pipes.Floor The floor in the equipment room should be semi-conductive anddustproof. A raised floor with an ESD covering is recommended. Coverthe raised floor tightly and solidly. The horizontal tolerance of eachsquare meter should be less than 2 mm (0.08 in.). If raised floors areunavailable, use a static-electricity-conductive floor material, with avolume resistivity of 1.0 x 107 ohms to 1.0 x 1010 ohms. Ground thisfloor material or raised floor. You can connect them to ground using aone megohm current-limiting resistor and connection line.Load-bearingcapacityThe floor must bear loads larger than 150 kg/m2 (0.21 bf/in.2).R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.66
Item RequirementsDoor andwindowsThe door of the equipment room should be 2 m (6.56 ft) high and 1 m(3.28 ft) wide. One door is enough. Seal the doors and windows withdustproof plastic tape. Use double-pane glass in the windows and sealthem tightly.Wall surfacetreatmentPaste wallpaper on the wall or apply flat paint. Do not use pulverizedpaint.Cable trays Use cable trays to arrange cables. The inner faces of the cable trays mustbe smooth. The reserved length and width of the cable trays, and thenumber, position and dimensions of the holes must comply with therequirements of device arrangement.Water pipe Do not pass service pipes, drainpipes, and storm sewers through theequipment room. Do not place a fire hydrant in the equipment room, butplace it in the corridor or near the staircase.Internalpartition wallSeparate the area where the equipment is installed from the equipmentroom door. The partition wall can block some outside dust.Installationposition of theair conditionerInstall air conditioner vents so that the air does not blow directly onequipment.OtherrequirementsAvoid the proliferation of mildew, and keep out rodents (like mice). Figure 5-80 Internal partition wall inside the equipment room Equipment Room EnvironmentDust on devices may cause electrostatic discharge and result in poor contact for connectors ormetal connection points. This problem can shorten the life span of devices and cause faults.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.67
The equipment room must be free from explosive, conductive, magnetically-permeable, andcorrosive dust. Table 5-11 lists the requirement for dust concentration in the equipment room.Table 5-11 Requirements for dust particles in the equipment roomMechanical activematerialUnit ConcentrationDust particle Particle /m3≤ 3x 104(no visible dust accumulatedon a workbench in threedays)Suspending dust mg/m3≤0.2Precipitable dust mg/m2·h ≤1.5DescriptionlDust particle diameter ≥ 5 µmlSuspending dust diameter ≤ 75 µml75 µm ≤ precipitable dust diameter ≤ 150 µm Take the following measures to meet the requirements:lUse dustproof materials for ground, wall, and ceiling construction.lUse screens on the door and windows facing outside. The outer windows should be dust-proof.lClean the equipment room regularly and clean the air filter monthly.lWear shoe covers and ESD clothing before entering the equipment room.Requirements for Corrosive GasesThe room should be free from dusts and corrosive gases, such as SO2, H2S, and NH3. Table5-12 lists the requirements for the corrosive gas concentration.Table 5-12 Requirements for corrosive gas concentrationChemical activematerial Unit ConcentrationSO2mg/m3≤0.20H2Smg/m3≤0.006NH3mg/m3≤0.05Cl2mg/m3≤0.01 Take the following measures to meet the requirements:R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.68
lAvoid constructing the room near a place where the corrosive gas concentration is high,such as a chemical plant.lEnsure the air intake vent of the room is in the prevailing upwind direction from anypollution source.lPlace batteries in different rooms.lA professional service should monitor the corrosive gas conditions regularly.Requirements for ESD PreventionThe absolute value of electrostatic voltage must be less than 1000 V.Take the following measures to meet this requirement:lTrain operators about ESD prevention.lKeep the correct humidity level in the equipment room to reduce the impact of staticelectricity.lLay out an ESD floor in equipment rooms.lWear ESD shoes and clothing before entering equipment room.lUse ESD tools, such as wrist straps, tweezers, and pullers.lGround all conductive materials in the room, including computer terminals. Use ESDworktables.lKeep non-ESD materials (such as common bags, foam, and rubber) at least 30 cm (11.81in.) away from boards and ESD-sensitive components.Electromagnetism Requirements for the Equipment RoomAll interference sources, inside or outside the equipment room, can cause equipment problemswith capacitive coupling, inductive coupling, electromagnetic wave radiation, and commonimpedance (including grounding system) coupling. Prevent the interference using theseapproaches:lTake effective measures against electrical interference from the power supply system.lDo not use the working ground of the equipment as the same ground for surgeprotection. Separate them as far as possible.lKeep the equipment far away from high-power radio transmitters, radar units, and high-frequency and high-current equipment.lUse electromagnetic shielding if necessary.Requirements for Lightning Proof GroundingTable 5-13 lists the requirements for lightning proof grounding.Table 5-13 Requirements for lightning proof groundingItem RequirementsCapitalconstructionlUse reinforced concrete to construct the equipment room.lInstall a lightning proof device like a lightning rod outside the room.lThe lightning proof ground shares the same grounding body withthe protective ground of the room.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.69
Item RequirementsPower cablesleading in theequipment roomneed to beequipped with asurge protectorlAfter the low-voltage power cables are led into the room, install thesurge protector for the power cables in the AC voltage stabilizer andthe AC power distribution panel (box). Correctly ground the surgeprotector nearby.lFor an equipment room in urban area, install a power supply surgeprotector with the nominal discharge current of no less than 20 kA.For an equipment room that is built in a suburb and subject tolightning strikes, install a power supply surge protector with thenominal discharge current of more than 60 kA. For an equipmentroom that is built in a mountain area and subject to frequentlightning strikes, or in a separate high-rise building in a city, install apower supply surge protector with the nominal discharge current ofmore than 100 kA.lThe ground cable of the surge protector should be no longer than 1m (3.28 ft).Grounding forDC powerdistributionlConnect the DC working ground (positive pole of the -48 V DCpower supply or the negative pole of the 24 V DC power supply)with the indoor collective ground cable nearby. The total groundcable should meet the maximum load of the equipment.lThe power equipment must have a DC working ground cable, whichcan connect the power equipment to the collective ground cable ofthe telecommunication site (or the protective ground bar of theequipment room).EquipotentialconnectionlProperly ground the devices and auxiliary devices in the room suchas mobile base station, transmission, switching equipment, powersupply equipment, and cable distribution frame. Connect all PGNDcables to the collective protective ground bar. Connect all PGNDcables in one equipment room to one protective ground bar.lApply joint grounding to the working ground and protective groundof devices, which means the two share one grounding network.lThe cable tray, rack or shell, metal ventilation pipe, metal door orwindow of the equipment should be grounded for protection.Generalrequirements forgroundinglDo not connect the neutral line of the AC power cable with theprotective ground of any telecom equipment in the equipment room.lDo not install a fuse or switch on the ground cable.lAll ground cables should be as short as possible, and arranged in astraight line.GroundingresistancelThe grounding resistance must be lower than 1 ohm.lThe upper end of the grounding body should be at least 0.7 m (2.30ft) over the ground. In cold areas, bury the grounding body belowthe frozen ground.lMeasure the grounding resistance periodically to ensure effectivegrounding.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.70
Item RequirementsRouting ofsignal cablelDo not arrange the signal cables overhead in the equipment room.All signal cables must be led into the site underground.lUse the cables with a metal jacket or place them into a metal pipe ifthey come out/in the equipment room.lGround the idle lines inside the cable in the equipment room.lSignal cables should be deployed on internal walls. Do not deployoutdoor aerial cables.lKeep signal cables away from power cables and surge protectiondevices.Collectiveground cablelUse a ground ring or ground bar for the collective ground cable.lDo not use aluminum cables as ground cables. Adopt measures toprevent electrification corrosion when connecting different metalparts together.lUse a copper busbar as the collective ground cable with a cross-sectional area of no less than 120 mm2 (0.19 in.2), or use thegalvanized flat steel of the same resistance. Insulate the collectiveground cable from the reinforcing steel bars of the building.Grounding lead-inThe grounding lead-in should be a maximum of 30 m (98.42 ft) long.Use the galvanized flat steel with cross-sectional area of 40 mm x 4mm (1.58 in. x 0.158 in.) or 50 mm x 5 mm (1.97 in. x 0.197 in.).R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.71
Item RequirementsGrounding of thecabinetlAll the devices including the surge protection device in the cabinetmust be connected in an equipotential manner. The ground cablescan be aggregated to the ground bar or surge protector socket first,and then the ground bar or surge protector socket can be connectedto the ground.lThe resistance between the device ground terminals and ground barcannot exceed 0.1 ohm.lThe cabinet can be grounded using the protecting earthing (PE) wireof the electrical network in the building, zinc-coated angle steel, orthe main steel bar of the building.lIf the cabinet is grounded using the PE wire of the electricalnetwork, use a multimeter to test the grounding status. If the voltagebetween the PE wire and neutral wire is lower than 5 V and thevoltage between the PE wire and live wire is about 220 V, the PEwire is grounded well. If the tested AC voltages are not within theranges, the cabinet must be grounded in other ways.lThe yellow-green ground cable contains multiple copper wires. Thecross-sectional area of the ground cable must be no less than 6 mm2(0.0093 in.2) and the length cannot exceed 3 m (9.84 ft.).lGround cables cannot be twisted with signal cables.lAntirust and anticorrosion measures must be taken on the groundterminals.lThe fiber reinforcing rib can be directly connected to the ground barof the cabinet. Before wrapping the reinforcing rib with insulationtape, cut a 0.5 m (1.64 ft.) segment from the reinforcing rib. Wrapthe reinforcing rib with at least five layers of insulation tape. Keepthe reinforcing rib at least 5 cm (1.969 in.) from the cabinet surface. 5.2.2 Requirements for Power SupplyRequirements for AC Power SupplyAn AC power supply system consists of power mains, uninterruptible power supplies (UPSs),and self-supplied electric generators. In addition to meeting the requirements of the serverload, the AC power supply must have a simple connection line, safe operation, flexiblescheduling, and easy maintenance.The low-voltage power supply should be 3-phase, 5-wire mode or monophase 3-wire mode.This AC power supply should be 110 V/220 V, with a frequency of 50 Hz.The UPS should supply the same power and operate at the same phase as the power mains.The switching time between the UPS and mains should be less than 10 ms; otherwise, thenetworking devices will reboot or reset.For power distribution capacity in the equipment room, both the working current and faultcurrent of the devices should be considered. Ensure that independent AC power suppliesR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.72
protect independent devices. Configure the current-carrying capacity of the protection switchof the equipment room for more than that of the devices.Table 5-14 lists the voltage range of the AC power supply for the devices.Table 5-14 Voltage range of AC power supplyItem RequirementsAC power capacity tosupport the devices-10% to +5% of the rated voltageAC power capacity tosupport the power modulesand important buildings-15% to +10% of the rated voltageFrequency of alternatingcurrent-4% to +4% of the rated valueVoltage wave shape sinedistortionWithin 5% of the rated voltage The automated electric generator must have a standard interface that supportstelecommunication protocols, remote telecommunication, monitoring, and control.AC power cables should meet the following specifications:lAC neutral should have a conductor with the same cross section as the phase line.lAC cables should have non-flammable insulation. The layout of AC cables shouldcomply with local regulations. Low-voltage power distribution rooms should complywith local regulations.Recommendations for AC Power SupplyThe following are recommendations for the AC power supply.lIf the voltage of the power mains that supply power directly to devices exceeds the ratedvoltage by -10% to 5%, or exceeds the voltage range that devices can support, a voltageregulating device or voltage stabilizing device is required.lIf the mains do not supply power for the device directly, or if the mains voltage exceedsthe rated voltage by -15% to 10% or exceeds the input voltage range of the DC powersupply, a voltage regulating device or voltage stabilizing device is required.lA UPS or inverter power supply system is required to provide uninterrupted AC powerto support the telecommunication load.lIf abnormalities occur on the mains, telecommunication servers should be equipped witha self-supplied electric generator to support the key telecommunication load. Thecapacity should be not less than 150% to 200% of the total uninterruptible power supply.lStorage batteries are usually installed in a parallel connection of two groups. UPSstorage batteries are generally installed in one group. The redundancy required for theUPS can rely on concatenation or parallel connection. When an inverter or a UPS isused, the active inverter is determined by the maximum power and a backup inverter isrequired.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.73
Requirements for DC Power SupplyThe equipment room should receive stable and reliable DC power. Deploy the powerequipment near the telecommunications equipment to make the DC feeder as short aspossible. To reduce power consumption and installation cost, the loop voltage drop from thebattery port to the equipment port should be less than 3.2 V.lA large-scale enterprise can deploy an independent power supply system on each floor tosupply power to the telecommunications equipment room on the respective floor.lA medium-scale enterprise can use a power room and a battery room for centralizedpower supply or use distributed power supply systems.lA small-scale enterprise can deploy an integrated power supply system in its equipmentroom but must take measures to prevent corrosive gases released from batteries fromeroding circuit boards of telecommunications equipment.Table 5-15 lists the specifications for the DC power supply.Table 5-15 Specifications for the DC power supplyItem RequirementsDC powercapacity tosupport the surgecurrentGreater than 1.5 times the rated currentRegulatedvoltage precisionIf the AC input voltage is in the range of 85% to 110% of the ratedvalue, and the load current is in the range of 5% to 100% of the ratedvalue, the output voltage of the rectifier ranges from -46.0 V to -56.4 V,with the regulated voltage precision less than or equal to 1%.Overshootamplitude ofswitch on/offIntegral value of the DC output voltage ±5%Peak noisevoltage≤200 mVDynamicresponseThe recovery time is less than 200 ms. The overshoot is in the range ofthe integral value of the DC output voltage ±5%. Recommendations for DC Power SupplyThe following are recommendations for the DC power supply.lUse distributed power supply mode. Use multiple DC power supply systems and putpower equipment in multiple locations.lAdopt a standard DC power supply system, and set the output voltage to thecommunications equipment within the required range.lImprove reliability of the AC power supply system to reduce the necessary capacity ofstorage batteries. For small offices, increase the capacity of storage batteries if it isdifficult to enhance reliability of the AC power supply system.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.74
lThe total capacity of the high-frequency switching rectifier must satisfy the power of thecommunication loading and battery charging. If there are 10 or fewer active rectifiermodules, configure one backup module. If there are more than 10 active modules,configure one backup module for every 10 active modules.lInstall storage batteries in two or more groups. The capacity is determined by theduration for which the storage batteries must supply power. For most offices, thebatteries should be able to supply power for at least one hour.5.3 Equipment Grounding Specifications5.3.1 General Grounding SpecificationsTable 5-16 shows the general grounding specifications.Table 5-16 General grounding specificationsNo. Description1 The working ground and protective ground, including the shielded ground and thelightning-proof ground of the cable distribution frame should share the samegrounding conductor.2 The cable trays, shells, metal ventilation pipes, metal doors and windows in theequipment room should be grounded for protection.3 The metal parts of the equipment which are electrically floating in normalconditions should be grounded for protection.4 The ground cable must be connected securely to the protective ground bar of theequipment room.5 Do not use other equipment as part of the ground cable or electrical connection. 5.3.2 Grounding Specifications for an Equipment RoomThe grounding resistance of a comprehensive communication building should be less than orequal to one ohm. The grounding resistance of an ordinary communication office should beless than five ohms. The grounding resistance in an area where the earth resistance rate is highshould be less than 10 ohms.5.3.3 Grounding Specifications for DevicesTable 5-17 lists the equipment grounding specifications.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.75
Table 5-17 Equipment Grounding SpecificationsNo. Description1 All communication devices and auxiliary devices (such as mobile base stations,transmission and switching devices, power supply devices) in the equipment roomshould be grounded for protection. Connect all protective ground for variousdevices jointly to a general ground bar, and then to the same protective ground barin the room together with the protective ground (PGND) of the device.2 The PGND of the equipment is shorted to the copper ground bar provided by thecustomer. The short-circuiting cable used should be a yellow-green plasticinsulated cable with a copper core and a cross-sectional area greater than 25 sq.mm (0.039 sq. in.).3 There are grounding terminals and grounding lugs at the lower part of the frontdoor, rear door and side panel of the cabinet, connected to the grounding terminalsof the cabinet framework through connection cables with cross-sectional area of noless than 1.6 sq. mm (0.002 sq. in.).4 Ensure that all metal components of the cabinet conduct well. No insulatingcoating should be sprayed on the connection part of the metal components.5 Connect the cabinets in the same row by fastening captive screws and gaskets onthe top of the cabinets. Do not spray any coating into a rectangular area measuring30 mm x 50 mm (1.18 in. x 1.97 in.) around the connection hole for a captive bolt.Measures to prevent rust and corrosion must be taken for this area. Zincelectroplating with iridescent yellow chromate conversion coating should beapplied to the gasket and nut to ensure good electrical contact.6 When combining cabinets of the same type, short-circuiting cables are required toconnect the ground busbars (if any) of the cabinets. The cross-sectional area of theshort-circuiting cable is 6 sq. mm (0.009 sq. in.) and is no more than 300 mm (11.8in.) long. Connect the two ends of the short-circuiting cable to the ground busbarterminals of neighboring cabinets and fix them firmly. 5.3.4 Grounding Specifications for Communications PowerSupplyTable 5-18 shows the grounding specifications for communication power supplies.Table 5-18 Grounding specifications for communication power suppliesNo. Description1 The inlet for the AC power cable at the equipment room should be equipped with asurge protection device (C-level) with a nominal discharge current no less than 20kA.2 The protective ground for the power supply and that for communication equipmentshare the same grounding conductor. If the power supply and the equipment are inthe same equipment room, use the same protective ground bar for them if possible.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.76
No. Description3 Use a surge protection circuit on the AC power interface.4 The positive of the -48 V DC power supply or negative pole of the 24 V DC powersupply should be grounded at the output of the DC power supply.5 The working ground and protective ground of the DC power supply equipmentshould use the same grounding conductor with the protective ground of theswitching equipment. If the power supply and equipment are in the sameequipment room, use the same protection ground bar for them if possible.6 Add surge protection on the DC power interface. 5.3.5 Grounding Specifications for Signal CablesTable 5-19 lists the grounding specifications for signal cables.Table 5-19 Grounding specifications for signal cablesNo. Description1 Equip the cable outdoors with a metal jacket, well grounded at both ends, orconnect the ends of the metal jacket to the protective ground bar of the equipmentroom. For cables inside the equipment room, install surge protection devices at theinterface to the equipment. The PGND cable for the surge protection devicesshould be as short as possible.2 The incoming and outgoing signal cables to and from the office and unused wiresinside the cable should be grounded for protection.3 The Tone & Data Access (TDA) cable must pass through the Main DistributionFrame (MDF) with surge protective device (SPD) when going out of the office.The cable's shield layer should be connected to the protective ground of the MDF.The MDF should use the same grounding conductor as the cabinet.4 Do not route signal cables overhead. 5.3.6 Specifications for Laying Out Grounding CablesTable 5-20 shows the specifications for the ground cable.Table 5-20 Specifications for laying out ground cablesNo. Description1 The grounding wire should not run parallel to or twist around the signal cable.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.77
No. Description2 Bury ground underground or arrange them indoors. Do not route ground cablesoverhead.3 Do not connect two cables together to extend the PGND cable, or add any switchesor fuses.4 The PGND cable should be an alternating yellow and green plastic insulated onewith a copper core.5 The neutral line of the AC power cable cannot be connected to the protectiveground of transmission and communication equipment in the equipment room.6 A PGND cable should be as short as possible, with a length of no more than 45 m(147.64 ft). 5.4 Engineering Labels for CablesAn engineering label serves as an identifier for on-site installation and maintenance after theinstallation. Labels on the cables facilitate correct and orderly connection of cables, and easymaintenance after installation.Engineering labels are specialized for power cables and signal cables:lSignal cables include network cables, optical fibers, and user cables.lPower cables include the AC power cables and DC power cables.NOTEFill in labels according to specified requirements to keep consistency of labels in the equipment room.Make a relevant statement in the self-check report.5.4.1 Introduction to LabelsLabel MaterialsFeatures:lThickness: 0.09 mm (0.004 in.)lColor: chalk whitelMaterial: polyester (PET)lAmbient temperature: -29°C (-20.2°F) to +149°C (300.2°F)lPrinted by a laser printer and written with a markerlPass UL and CSA authenticationR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.78
Type and StructureLabel for Signal CablesThe label for signal cables is L-shaped with fixed dimensions, as shown in Figure 5-81.Figure 5-81 Label for signal cables To specify more clearly the position of a cable, use the dividing lines on the label. Forexample, there is a dividing line between the cabinet number and the chassis number, andanother one between the chassis number and the slot number. Each dividing line is light blue(Pantone 656c) and 1.5 mm x 0.6 mm (0.06 in. x 0.02 in.).The cut dotted line helps to fold the label when affixed to the cable, and its size is 1 mm x 2mm (0.04 in. x 0.08 in.).The word "TO:" (upside down in the figure) at the lower right corner of the label is used toidentify the opposite end of the cable on which the label is affixed.Power Cable LabelThe label for power cables should be attached to the identification plate on the cable ties thatare attached to the cable. The identification plate has an embossed area 0.2 mm x 0.6 mm(0.008 in. x 0.02 in.) around (symmetric on both sides), and the area in the middle is foraffixing the label, as shown in Figure 5-82.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.79
Figure 5-82 Power cable label Label PrintingThe contents can be printed or written on the labels. Printing is recommended for the sake ofhigh efficiency and eye-pleasant layout.Template for PrintingYou can obtain a template from the Huawei local office to print labels.The template is made in Microsoft Word. Follow these instructions to use the template:lYou can modify the contents of the template. Do not change settings of centeredcharacters, direction, and fonts.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.80
lIf many characters need to be filled in, decrease the font size, but make sure that theprintouts are clear and legible.Merging Cells in the TemplateTo merge two or more cells, do as follows:1. Select Edit/Select All.2. Select Format/Borders and Shading/Borders. Select Box tab and click OK.3. Drag the mouse to select cells to be merged and select the Table/Merge Cells.Requirements on the PrinterTo print labels, use a laser jet printer of any model. Before printing labels, set up the page andtry printing.1. Try printing on ordinary paper with both sides blank. Place the blank paper over thewhole page of the label paper, and check whether the page setup conforms to the labellayout.2. Make sure the printer properties, such as "paper size" and "direction", have been setcorrectly.–If the printout conforms to the sheet of labels, print the labels on the label paper.–If the printout does not conform, adjust the page setup and try printing again untilthe correct printout is produced.The method for adjusting the page setup is as follows.1. Select File/Page Setup.2. Select Layout and set Header and Footer as 0.3. Select the Margins tab page. Select Left for Gutter Position and adjust the values of Top,Bottom, Left, and Right.NOTEIf the warning prompt as shown in Figure 5-83 appears before printing, click Ignore to continuethe printing.Figure 5-83 Warning prompt before printing After the page setup has been made correctly, save it for future use. This page setup is onlynecessary the first time you use the template to print the labels.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.81
Requirements for Feeding the PrinterThe label paper consists of two layers and has undergone multiple processing procedures suchas printing and cutting. No matter what model of printer you use, feed in the labels one pageat a time. To avoid jamming the labels, never use the auto-feed mode.Feed in the label paper in the correct direction to ensure that the text is printed in a correctposition.Requirements for the Printed LabelMake sure that the printed labels satisfy the following requirements:lAll the printouts must be on the label, and nothing should be printed on the backing layerof the label page.lContents in the cells should be aligned in the center. In a single-line printout, thedividing lines and the word "TO:" should not be covered by printed characters.lWhen the cells are merged and the printouts are made in multiple lines, avoid coveringthe word "TO:" when printing the text. Use the space bar to move the text to the nextline.Writing LabelsWriting ToolsTo make sure the printouts are clear and legible, use black markers instead of ball-point pensto write the labels.If no marker is available, black ball-point pens are allowed, although not recommended.Compared with ball-point pens, water-proof markers are better. When writing with a ball-point pen, do not leave the oil on the label, which may contaminate the label and blur thewords.NOTEThe delivered marker has two nibs. Use the smaller nib to write the labels.FontFor the sake of legibility, use standard block letters and numbers as shown in Table 5-21(Times New Roman).Table 5-21 Standard typeface for handwriting0123456789 A B C D E F G HI J K L M N O P QR S T U V W X Y Z Determine the size of characters based on the number of letters or digits and ensure that thecharacters are distinct and tidy.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.82
Placement of text on a label is shown in Figure 5-84.Figure 5-84 Placement of text on a label Attaching LabelsAfter printing or writing the label, remove the label from the page and attach it to the signalcable, or the identification plate of the power cable. The methods for attaching labels aredescribed in the following sections.Label for Signal CableslChoose the place to attach labels.The label is attached 2 cm (0.79 in.) from the connector on a signal cable. In specialcases (for example, to avoid cable bending or affecting other cables), other positions areallowed to attach the labels. The rectangular part with text is attached facing right ordownward, as shown in Figure 5-85. The details are as follows:–The identification card is to the right of the cable in vertical cabling.–The identification card should be downward when you lay out the cablehorizontally.Figure 5-85 Text area of the label lProcedure for attaching labelsFigure 5-86 shows the methods and procedures for attaching labels.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.83
Figure 5-86 Label for signal cables Power Cable LabelRemove the label from the backing page, and attach it to the identification plate on the cabletie. The label should be attached to the rectangular flute on the identification plate, andattached to only one side of the identification plate. The cable ties are bundled at 2 cm (0.79in.) from the connectors, and other positions are allowed in special circumstances.Cable ties should be bound on both ends of a cable. After the bundling, the finishedidentification plate should be on top of the cable in horizontal cabling, or on the right side ofthe cable in vertical cabling, as shown in Figure 5-87. The details are as follows:lThe identification card is to the right of the cable in vertical cabling.lThe identification card is on the top of the cable in horizontal cabling. Make sure that thelabel is facing out.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.84
Figure 5-87 Binding the label for the power cableThe identification card is on the top of the cable in horizontal cabling. The identification card is to the right of the cable in vertical cabling. TO:B03 -48V2TO:B03 -48V2CableCable Contents of Engineering LabelsContents of Labels for Power CablesLabels for power cables are affixed on only one side of the identification plates. On the labels,there is information (the part after the word "TO:") about the location of the device on theother end of the cable, like the location of control cabinet, distribution box or power socket.Contents of Labels for Signal CablesThe two sides of the label affixed on the signal cable carry information about the location ofthe ports connected to both ends of the cable. Figure 5-88 shows the information on bothsides of the labels affixed to the signal cables.lArea 1 contains the location information of the local end of the cable.lArea 2 (with the word "TO:") contains the location information of the opposite end of thecable.lArea 3 has been folded up inside the label.Figure 5-88 Printed parts on the label for signal cables Seen from the cabling end of the equipment, the text part of the label is on the right side of thecable. The side with "TO:" that is facing outside carries the location information of theopposite end; and the other side carries the location information of the local end.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.85
In other words, the information in Area 1 at one end is the same as the information in Area 2at the other end of the cable.Precautions for Using Engineering LabelsWhen using labels, pay attention to the following points:lWhen printing, writing, or attaching labels, keep the labels clean.lSince the label paper is made of moistureproof material, ink-jet printers and ink penscannot be used to print and write labels.lLabels should be attached neatly. New-type labels are L-shaped. If they are pasted atincorrect locations or in the incorrect direction, the appearance of the device is affected.lPower cable ties should be attached in the same positions on power cables, withidentification plates on the same side.lThe positions of "up", "down", "left" or "right" are all based on the viewpoint of theengineering person who is working on the label.5.4.2 Engineering Labels for Optical FibersThese labels are affixed to the optical fibers that connect the optical interfaces on the boardsin a chassis, or on the device boxes. There are two types of labels for optical cables:lOne is for the fiber that connects the optical interfaces on two devices.lThe other is for the fiber that connects the device and the ODF.Labels for the Optical Fibers Connecting DevicesMeaning of the LabelTable 5-22 lists information on both sides of the labels affixed to the optical fibers thatconnect two devices.Table 5-22 Information on labels affixed to the fibers between two devicesContent Meaning ExampleMN-B-C-D-R/TMN: cabinetnumberM: The cabinet rows from front to back are numberedfrom A to Z.N: The cabinet columns from left to right are numberedfrom 01 to 99.For example, A01 is the cabinet in row A and column01.B: chassisnumberNumbered in bottom-up order with two digits, forexample, 01.C: physical slotnumberNumbered in top-down and left-right order startingfrom 01. For example, 01 is the first slot at the top leftof the chassis.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.86
Content Meaning ExampleD: opticalinterfacenumber.Numbered in top-down and left-right order, consistentwith the port sequence number on the device.R: ReceivinginterfaceT: opticaltransmittinginterface- Example of the LabelFigure 5-89 shows a sample label on an optical fiber.Figure 5-89 Sample label on an optical fiber between two devicesA01 RTO:01 05 01G01 T01 01 01 The meaning of the label is listed in Figure 5-89.l"A01-01-05-01-R" indicates that the local end of the optical fiber is connected to theoptical receiving interface 01 in slot 5, chassis 01 in the cabinet in row A, column 01 inthe machine room.l"G01-01-01-01-T" indicates that the opposite end of the optical fiber is connected withoptical transmitting interface 01 in slot 01, chassis 01 in the cabinet in row G, column 01in the machine room.Labels for the Optical Fibers Connecting the Device and an ODFMeaning of the LabelsTable 5-23 shows information on both sides of labels attached to an optical fiber between adevice and an optical distribution frame (ODF).Table 5-23 Information on labels affixed to a fiber between a device and an ODFContent Meaning ExampleMN-B-C-D-R/TMN: cabinetnumberFor example, A01.B: chassisnumberNumbered in bottom-up order with two digits, forexample, 01.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.87
Content Meaning ExampleC: physical slotnumberNumbered in top-down and left-right order startingfrom 01. For example, 01 is the first slot at the top leftof the chassis.D: opticalinterfacenumber.Numbered in top-down and left-right order, consistentwith the port sequence number on the device.R: OpticalreceivinginterfaceT: opticaltransmittinginterface-ODF-MN-B-C-R/TMN: rownumber andcolumn numberof an ODFM: The cabinet rows from front to back are numberedfrom A to Z.N: The cabinet columns from left to right arenumbered from 01 to 99.For example, G01 is the ODF of row G and column01.B: row numberof the terminaldeviceRange from 01 to 99, for example, 01-01.C: columnnumber of theterminal deviceR: OpticalreceivinginterfaceT: opticaltransmittinginterface- Example of the LabelFigure 5-90 shows a sample label on an optical fiber.Figure 5-90 Sample label on an optical fiber between the device and the ODFODF RTO:G01 01 01A01 R01 05 01 R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.88
Meaning of the label in Figure 5-90l"ODF-G01-01-01-R" indicates that the local end of the optical fiber is connected to theoptical receiving terminal in row 01, column 01 of the ODF in row G, column 01 in themachine room.l"A01-01-05-01-R" indicates that the opposite end of the optical fiber is connected tooptical receiving interface 1 in slot 05, chassis 01 in the cabinet in row A, column 01 inthe machine room.5.4.3 Engineering Labels for Network CablesApplicable RangesThe labels can be applied to Ethernet cables.Label ContentTable 5-24 shows the information on both sides of the labels affixed to Ethernet cables.You can also decide the label content based on the actual environment. If the device is notinstalled in the cabinet, for example, you can remove the cabinet number.Table 5-24 Information on the Ethernet cablesContent Meaning ExampleMN-B-C-D MN: cabinetnumberFor example, A01 is the first cabinet in row A.B: chassisnumberNumbered in bottom-up order with two digits, forexample, 01.C: physical slotnumberNumbered with two digits in top-down and left-right order. For example, 01.D: network portnumberNumbered in top-down and left-right orders. Forexample, 01.MN-Z MN: cabinetnumberFor example, B02 is the second cabinet in row B.Z: LocationnumberFill in the location number of the terminal deviceon site. If the cable is connected to a device in acabinet, specify the serial numbers of the cabinet,the chassis, and the Ethernet interface of the device.For example, B02-03-12. If the cable is connectedto the Network Management Station (NMS),specify the specific location of the NMS. The contents of the labels for network cables connecting hubs and devices or agents and thenetwork cables for other purposes should be specified according to actual connections. Thedetails are as follows:R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.89
lFor a network cable connecting a hub and device, the label on the hub end shouldindicate the numbers of the chassis and cabinet where the hub resides, and the serialnumber on the hub. The label on the device end should indicate the number of thechassis and cabinet where the device is located. If the device is a standalone device,provide the specific position of the device.lFor a network cable connecting a hub and an agent or terminal, the label on the agent orterminal end should contain the serial number of the network interface. The definitionsof the cabinet number and chassis number are the same as those described in Table 5-24.lIf the hub is a standalone device without a cabinet or chassis, the label should containspecific location information that identifies the hub.The serial number on the hub, the network interface number of the agent or terminal, and thelocation of the standalone device should be specified according to actual connections.Label ExampleFigure 5-91 shows a sample label on an Ethernet cable.Figure 5-91 Sample label on an Ethernet cableA01TO:03 01 01B02 03 01 Meaning of the label in Figure 5-91.l"A01-03-01-01" indicates that one end of the network cable is connected to networkinterface 01 in slot 01, chassis 03 of the cabinet in row A, column 01 in the equipmentroom.l"B02-03-01" indicates that another end of the network cable is connected to networkinterface 01 in chassis 03 of the cabinet on row B, column 02 in the equipment room. Noslot number is given.5.4.4 Engineering Labels for User CablesAttach labels to both ends of a user cable to indicate the locations of the cable on the deviceand main distribution frame (MDF).Meaning of the Engineering Labels for User CablesTable 5-25 shows the contents of the labels.Table 5-25 Contents of the engineering labels for user cablesContent Meaning ExampleMN-B-C-D MN: cabinetnumberFor example, A01 is the first cabinet in row A.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.90
Content Meaning ExampleB: frame number Numbered in the bottom-up order with two digits,for example, 03.C: physical slotnumberNumbered with two digits in top-down and left-right order. For example, 01.D: cable number Numbered with two digits in top-down and left-right order. For example, 01.MDF-MN-B-C MN: row numberand columnnumber of theMDFM: The rows of cabinets from front to back arenumbered from A to Z. N: The columns of cabinetsfrom left to right are numbered from 01 to 99. Forexample, G01 is the MDF of Row G and Column01.B: row number ofthe terminaldeviceRanges from 01 to 99, for example, 01-01.C: column numberof the terminaldevice Example of the LabelFigure 5-92 shows a sample label on a user cable.Figure 5-92 Sample label on a user cableA01TO:03 01 01MDF G01 01 01 The meaning of the label in Figure 5-92 is as follows:l"A01-03-01-01" indicates that the local end of the user cable is connected to port 1 inslot 1, chassis 03 of the cabinet in row A, column 01 in the equipment room.l"MDF-G01-01-01" indicates that the opposite end of the user cable is connected to theterminal in row 01, column 01 of the MDF in row G, column 01 in the equipment room.5.4.5 Engineering Labels for Power CablesR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.91
Engineering Labels for DC Power CablesThese labels are affixed to the DC power cables that provide power supply for cabinets,including the -48 V, PGND, and BGND cables. Here, the DC power cables also include powercables and PGND cables.The labels for DC power cables are affixed to one side of the identification plates on cableties. For details of the labels, see Table 5-26.Table 5-26 Contents of the labelContent MeaningMN(BC)-B--48VnMN(BC): BC is written right under MN.B: chassis number, numbered in bottom-up order with two digits, forexample, 01.N: power socket number, numbered as 1 to 3 in the bottom-up and left-to-right orders.On the loaded cabinet side, only MN is used to identify the cabinet.On the power cabinet side, MN identifies the row and column numberof the power distribution equipment like a control cabinet anddistribution box, and BC identifies the row and column number of the-48 V connector. If there is no row number or column number, or theconnector can be identified without them, BC can be omitted. It isunnecessary to identify the row and column number for BGND andPGND.MN(BC)-B-BGNDMN(BC)-B-PGND The label only carries location information about the destination direction of the power cablewhereas information about the local end is unnecessary. That is, the label only carries locationinformation about the opposite equipment, the control cabinet, or the distribution box. Table5-26 lists the information on two -48 V power supplies on the label. The information on otherDC voltages, such as 24 V and 60 V should be given in similar methods.Make sure that labels are affixed in the correct direction. That is, after the cable ties arebundled onto the cable, the identification plates with the labels should face up, and the text onthe labels in the same cabinet should be in the same direction. For details, see Figure 5-93.Figure 5-93 Example of the labels for DC power cables R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.92
The meaning of the label in Figure 5-93 is as follows:lOn the loaded cabinet side, the label "A01/B08--48V2" on the cable indicates that thecable is -48 V DC supply, which is from the eighth connector in row B of -48 V bus barin the cabinet in row A, and column 1 in the equipment room.lOn the distribution box side, the label "B03--48V2" indicates that the cable is -48 V DCsupply, connected to DC power socket 2 in row B, column 03 in the equipment room.NOTEIn the power distribution box or the first power cabinet of a row in a transmission equipment room,every terminal block on the -48 V connector bar has a numeric identification. For example, in the abovelabel of "A01/B08--48V2", "08" (or sometimes "8") is the numeric identification of the terminal block.PGND and BGND are two copper bars, on which the terminal blocks are short-circuited.Therefore, it makes no difference which terminal is connected to them. It is only necessary togive the row and column of the power distribution box, instead of giving the specific serialnumber of the terminal block on the copper bar. For example, if the label on the loadedcabinet side is "A01-BGND", it means that the power cable is a BGND that connects BGNDcopper bar in the power distribution box in row A, column 01 in the machine room.Information on the labels for PGND cables should be given in a similar way.Engineering Labels for AC Power CablesThese labels are affixed to both ends of an AC power cable that provides AC power supply tocabinets, including 110/220 V, PGND, and BGND cables. The 110/220 V AC cables andrelated PGND and BGND cables are covered with an insulating sheath, so the labels need tocontain only the word "AC" and the cabinet numbers.The labels for AC power cables are affixed to one side of the identification plates on cableties. For details, see Table 5-27.Table 5-27 Label contentContent MeaningMN-(B)-ACn MN: serial number of the cabinet or the socket where the power is ledinB: chassis number, numbered in bottom-up order with two digits, forexample, 01.n: power port number, numbered as 1 to 3 in bottom-up and left-to-rightorder.Serial number of the socket where the power is led in: the location ofthe socket is marked according to the actual situation. If the sockets canbe identified by row numbers and column numbers, they can benumbered following the same rule for the cabinets. If the socketscannot be identified by rows and columns, specify the detailedlocations to avoid confusion with other sockets. The label only carries location information about the opposite equipment and the powersocket; information about the local end is unnecessary.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.93
Make sure that labels are affixed in the correct direction. That is, after the cable ties arebundled onto the cable, the identification plates with the labels should face up, and the text onthe labels in the same cabinet should be in the same direction, as shown in Figure 5-94.Figure 5-94 Labels for AC power cablesLabel on the loaded cabinet side(indicating the position of the cableon the power distribution box)Label on the distribution box side(indicating the position of the cableon the loaded cabinet side) Meaning of the label in Figure 5-94.lOn the equipment cabinet side, the label marked "A01-AC1" indicates that the powercable is connected to the first AC power socket of row A and column 01 in theequipment room.lOn the power socket side, the label marked "B01-AC1" indicates that the power cable isconnected to the first AC power socket in the cabinet of row B and column 01 in theequipment room.5.5 Guide to Using Optical ModulesCommon Faults of an Optical ModuleNOTEThe system may fail to obtain information about non-Huawei-certified optical modules or obtain incorrectinformation. You are advised to use Huawei-certified optical modules. Obtain the electronic label of theoptical module and contact technical support personnel to confirm whether it is a Huawei-certified opticalmodule.1. An optical module is not completely installed in position.If the optical module is not completely installed in position and the latch boss is notsecured, the device cannot identify the optical module. After the optical module worksfor a long time, it will be ejected under external stress.2. The optical receptacle on an optical module is contaminated.If an optical module is not cleaned or protected properly, contaminants may accumulateon the fiber pin in the optical module. As a result, the coupling efficiency is reduced,optical signals are cut off, or even worse, the surface of the fiber pin is damagedpermanently.3. An optical module is burnt.If high-power optical signals (caused by an optical time domain reflectometer or self-loop test) are transmitted through an optical module that is used for long-distancetransmission but no optical attenuator is used, the optical power will exceed the overloadpower of the avalanche photodiode (APD). Then the optical module is burnt.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.94
The preceding faults lead to temporary or long-term cut-off of optical signals; or even causepermanent damages to the optical module, affecting communication services.Measures to Prevent a Loosened Optical Module1. When installing an optical module, insert it in position. If you hear a click or feel a slightshake, it indicates that the latch boss is secured.If the latch boss is not secured, the gold finger of the optical module is not in goodcontact with the connector on the board. In this case, the link may be connected butoptical signals will be cut off or the optical module will be loosened when the opticalmodule is shaken or hit.2. Figure 5-95 shows the release handle on an optical module when it is open and closed.When inserting the optical module, make sure that the release handle is closed. At thistime, the latch boss locks the optical module. After the optical module is inserted, trypulling it out to see if it is installed in position. If the optical module cannot be pulledout, it is secured.Figure 5-95 State of the release handle Close the release handle Open the release handleMeasures to Prevent Receptacle Contamination1. Cleaning tissues must be prepared on site. You need to clean the optical connector beforeinserting it in the receptacle. This protects the receptacle against contamination on thesurface of the optical connector.Figure 5-96 Cleaning optical fibers with special cleaning tissuesR250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.95
NOTEPlace at least three cleaning tissues on the work bench. As shown in Figure 5-96, wipe the end ofan optical connector from left to right or from right to left on a cleaning tissue, and then move theconnector end to the unused part of the cleaning tissue to continue.2. Cover an unused optical module with a protective cap to prevent dust, as shown inFigure 5-97.Figure 5-97 Installing a protective cap If no protective cap is available, use fibers to protect the optical module, as shown inFigure 5-98.Figure 5-98 Using fibers to protect an optical module 3. Cover unused optical connectors with protective caps, as shown in Figure 5-99, and thenlay out fibers on the fiber rack or coil them in a fiber management tray to prevent fibersfrom being squeezed.Figure 5-99 Installing a protective cap on a fiber 4. If a receptacle or an optical connector has not been used for a long time and is notcovered with a protective cap, you need to clean it before using it. Clean a receptaclewith a cotton swab, as shown in Figure 5-100. Clean an optical connector with cleaningtissues.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.96
Figure 5-100 Cleaning a receptacle with a cotton swab NOTICEWhen cleaning a receptacle, insert the cotton swab and turn it slowly in the receptacle.Do not use too much strength because the receptacle may be damaged.5. If optical signals are lost during the operation of a device, use the preceding method toclean the receptacle or the optical connector. In this manner, the possibility ofcontamination can be excluded.Measures to Prevent an Optical Module from Being Burnt1. Before using an optical time-domain reflectometer (OTDR) to test the connectivity or theattenuation of optical signals, disconnect the optical fibers from the optical module.Otherwise, the optical module will be burnt.2. When performing a self-loop test, use an optical attenuator. Do not loosen the opticalconnector instead of the optical attenuator.Precautions1. The optical connector should be vertically inserted in the receptacle to avoid damages tothe receptacle.2. Fibers must be inserted into optical modules of the corresponding type. That is,multimode fibers must be inserted into multimode optical modules, and single modefibers must be inserted into single mode optical modules. If a fiber is inserted into anoptical module of a different mode, faults may occur. For example, optical signals willbe lost.5.6 Fault Tag*Customer name:Address:Contact person:Tel.: Fax:R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.97
Category*: □ RMA □ Return □ AnalysisBOMCodeProductDescriptionBarCode*FaultOccurringDate*Descriptionof the FaultPhenomena*CategoryNo.*SoftwareVersion* Reasons for Repairing (Category No.):Category No. includes the following eight types:F001 - Wear out damaged (◊ In warranty Period ◊ Out of warranty period)F002 - Deployment damagedF003 - Intransit damagedF004 - Version upgradeF005 - Batch replaceF007 - Overdue spare parts inspectingF008 - OthersF011 - Running circumstance changeNote:lFor optical interface cards returned, the optical interfaces should be covered withprotection caps.lIn general, the analysis card will not be returned to you. If you have any specialrequirements, please contact Huawei.lOne Fault Tag should be adapted in one return category, such as RMA/Return/Analysis.lThe items marked with "*" are the mandatory fields that you must fill in. 5.7 Installation ChecklistComponentNo.ApplicableScopeCheck ItemAC 1Independent ACThe air vent of the device is free from blockage to ensurenormal heat dissipation.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.98
ComponentNo.ApplicableScopeCheck Item2Independent ACThe power modules are securely installed with their captivescrews tightly fixed.3Independent ACFour rubber pads are attached to specified positions on thebottom of the AC before it is placed on a desk.4Independent ACThe AC is secured in the cabinet or rack by rack-mountingbrackets or guide rails (or trays), and floating nuts arecorrectly secured.5 AC cardThe AC card is secured in the cabinet or rack by guide railsor trays, and the guide rails or trays and floating nuts arecorrectly secured.6 AC card The AC card is correctly inserted into the device slot andsecured using the ejector lever.7 AC card No pins on the backplane are bent when the AC card isinstalled.8Independent ACThe AC is grounded using a ground cable, meeting surgeprotection requirements.9Independent ACWhen the AC directly connects to APs, location IDs of theAPs are provided at the cable connection points.PoEpowersupply1 General The proper PoE switch or power adapter is selected, meetingAP power supply and onsite environment requirements.2 GeneralTo ensure that the PoE power meets requirements, the PoEpower supply device and APs must be connected throughCAT5E and CAT6E network cables, and the cable lengthcannot exceed 100 m.3 General Labels must be made for the PoE power cable to identify APlocations.4 General Leave a 20 cm space between PoE power adapters to ensurenormal heat dissipation.5 General The PoE switch is correctly grounded with the ground cable.6 GeneralReserve a few downlink network interfaces for the PoEswitch (for example, connect at most 20 APs to a 24-portswitch) for future capacity expansion.7 GeneralYou are advised to configure dual power modules for a PoEswitch for power redundancy backup and providing powerfor more APs.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.99
ComponentNo.ApplicableScopeCheck ItemAP1 GeneralThe AP installation positions comply with the networkplanning report and APs cannot be installed in environmentswith strong electrical or magnetic interference or corrosivematerials. If the onsite environment does not meetrequirements, adjust the AP installation positions properly.2 General The devices are installed correctly, securely, withoutdamages or paint peeling. Screws are tightened.3 GeneralLeave at least 20 cm space at the cable outlet and top(convex) of the AP to facilitate commissioning, maintenance,and heat dissipation. APs that dissipate heat from the rearmust be fixed using mounting brackets in wall mountingscenarios. Ensure that there is a certain space between theAPs and wall to facilitate heat dissipation.4 GeneralAPs with built-in antennas should be installed in open areasand there should be no obvious obstruction in the coveragedirection of the main lobe. The main lobe of built-in antennasfaces the top (convex).5 General The APs and antennas are neatly installed, without affectingthe overall layout of the environment.6IndoorAPIndoor APs are placed far away from windows and in dryenvironments with little dust and good ventilation. Thereshould be no inflammable materials in rooms. The indoortemperature and humidity must be within acceptable ranges.7IndoorAPWhen being mounted to a ceiling, the APs must be fixedusing the matching mounting brackets. The APs cannot behung in the air or placed directly on the ceiling. When theAPs are mounted to a wall, the bottom of the APs should beat least 30 mm from the ground. The APs should be installedin places out of reach of people.8OutdoorAPWhen two or more APs are installed in the same area, theymust be installed in the same vertical or horizontal line withcertain spacing greater than 15 mm.9 GeneralDustproof, waterproof, and anti-theft measures are taken andthe devices are kept clean. The APs are secured using thesecurity locks (separately purchased) based on onsitesituations and customer requirements. If APs are placed in anetwork box, ensure that the box is well-ventilated, clean,and dustless, and the ventilation holes are not blocked.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.100
ComponentNo.ApplicableScopeCheck Item10 IndoorAPIndoor APs should be mounted on walls with network portsdownwards to prevent device damages caused by water dropsor other liquid. Install the device in a site that is free fromleaking or dripping water, heavy dew, and humidity, and takeprotective measures to prevent water from flowing into theequipment along the cable.11 OutdoorAPWhen an outdoor AP is installed against a wall or pole, keepthe indicator downwards for easy observation.12 GeneralUse waterproof labels to mark the registration names of APson the AC, as well as their channels and IP addresses. Thelables should be attached to the front of the APs for easyobservation.13 GeneralRecord AP installation positions, MAC addresses, interfacesof uplink PoE switches, and IP addresses (APs use fixed IPaddresses) into a table.14 IndoorAPThe devices required during indoor AP installation, such asthe splitter, coupler, and antennas are operated in accordancewith specifications.15 General The APs using a metal shell (with a ground point) must beproperly grounded.16 OutdoorAP Unused radio ports should be installed with 50 Ω RF loads.17 OutdoorAPTake lightning protection measures on outdoor APs (theoutdoor APs have built-in 5 kV surge protectors. Ifcustomers require a higher surge protection capability on thefeeder ports, they can purchase additional surge protectivedevices, which need to be separately grounded). The APsshould be located in the protection scope (within a 45-degreeangle) of a lightning rod.18 OutdoorAPWhen an AP is mounted to a pole, the distance between theAP and the top of pole should be at least 30 cm.Signalcable 1 GeneralRoutes of signal cables comply with the engineering designdocument. The signal cables are correctly connected tofacilitate maintenance and capacity expansion.2 General Radio ports of an AP are correctly connected to radio portsA/B/C of antennas.3 GeneralSignal cable connectors are correctly installed and securelyconnected to the device. Wires of each signal cable aresecurely cramped in the connectors and pass connectivitytests.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.101
ComponentNo.ApplicableScopeCheck Item4 GeneralSignal cables are orderly routed and not crossed, twisted, orwinded (cables can be crossed at 1 m out of the cabinet). Thebend radius of cables meets requirements, and the cables arenot excessively bent.5 GeneralSignal cables are not damaged or broken and have no splices.Sufficient cable length is reserved. The reserved cables aretwined and placed properly to facilitate subsequentmaintenance.6IndoorAPThe optical, power, network, and feeder cables are bundledusing straps (one strap every 0.5 m) and securely fastened.7OutdoorAPThe signal cables shall be bundled at even intervals (about1000 mm), not too tight or too loose. The cables shall bebundled properly with cable ties placed in neat order. Cut offredundant cable ties and remove burrs from them to avoidinjuries. The cables shall be fixed using fasteners or ageing-resistant outdoor metal binding straps.8 GeneralKeep the signal cables away from heat sources and use heatinsulation materials to insulate the cables from the heatsources. Do not place signal cables on the air vents of thecabinet to avoid affecting subrack heat dissipation or cablelifetime.9 GeneralPigtail layout should meet the following requirements:lPigtails are not strained or twisted at the bent parts. Theyare bundled by binding tape with appropriate force.lPigtails can be pulled back and forth easily inside thecable tie and are not bent at a right angle.lPigtails are not squeezed by other cables or objects.lThe flange must be fixed.lPigtails are protected with protective tubes or envelopedin troughs when they are routed outside the cabinet. Theprotective tubes are bundled and processed to preventcutting.lThe optical fiber cannot be folded or twisted, and thepigtail cannot be squeezed. The binding diameter of anoptical fiber must be larger than 6 cm.lThe pigtail connection points must be clean and dustless.Fiber connectors and optical ports that are not used mustbe protected with protective caps or plugs. Cleaning mustbe carried out in strict accordance with Huawei toolspecifications.10 General The feeder cables shall not be bent or twisted, with no copperwire exposed.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.102
ComponentNo.ApplicableScopeCheck Item11 General The feeder cable connectors comply with correspondingstandards and are correctly connected, without looseness.12 GeneralThe feeder cables, power splitter, coupler, and surgeprotective devices are connected correctly and reliably inaccordance with specifications.13 GeneralStrong current and weak current cables are routed separately.The power cables, ground cables, and signal cables arebundled and routed separately (with a spacing of more than30 mm) to prevent electrical or magnetic interference. Useshielded cables in places with strong interference.14 GeneralWhen routing cables in walls, place the cables in the cabletroughs or pipes and fix the cables using pipe straps. For non-metal corrugated pipes, the fixing distance should be about1000 mm.15 OutdoorAPAll outdoor connectors or feeder cable connectors areproperly sealed to prevent water. Wrap the cable using one-layer PVC insulation tape, three-layer waterproof tape, andthen three-layer PVC insulation tape. The tape shall beattached evenly and neatly. The network cables shall becovered with waterproof PG tubes.16 OutdoorAPCable connectors are secured on cables and sealed to preventwater intrusion. The outlets of cable conduits on a wall aresealed by waterproof and flame-retardant materials. Driploops meeting the minimum bending radius requirement aremade on the network cable segment that stretches indoor.17 OutdoorAP Do not deploy cables overhead between two buildings.18 GeneralWaterproof labels (providing device names and cabledirections) are filled and attached to signal cables correctly.Each label is attached 20 mm to 100 mm from thecorresponding cable connector.19 OutdoorAPSurge protection measures are taken in the places where theoutdoor APs are installed. The outdoor APs, antennas, andsignal cables are deployed within 45-degree protection areaof a lightning rod.20 OutdoorAPThe bare wires of network and feeder cables should becovered by the winding pipes, flexible metal conduit, PVCpipes, or galvanization pipes. The cable outlet and inlet aresealed to prevent dusts.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.103
ComponentNo.ApplicableScopeCheck ItemAntenna 1 GeneralThe installation positions of antennas should comply with theengineering design and antennas should be securely andreliably installed.2 GeneralThere should be no obstacles in the major coverage directionof antennas. The direction and downlink tilt of antennasshould be adjusted based on the coverage targets.3 General There should not be metal subjects within 1 m around anoutdoor omnidirectional antenna.4 General The azimuth deviation of a directional antenna should bewithin 5 degrees and the tilt deviation within 0.5 degree.5OutdoorantennaThe antennas are fixed using special support that supportsinstallation of surge protection devices and shall be locatedwithin a 45 degree protection angle of a lightning rod. Whenan antenna is mounted to a pole, the distance between theantenna and top of the pole should be at least 30 cm.6OutdoorantennaTake waterproof measures on connectors of the antennas andfeeder cables and keep the drain holes of antennasdownwards.7OutdoorantennaThe pole used in antenna mounting should meet thefollowing requirements:Pole height: ≥ 2000 mmBottom pole diameter: ≥ 220 mmTop pole diameter: ≥ 120 mmPole thickness: ≥ 6 mmDepth of foundation: ≥ 1500 mmThe pole deployed outdoors must be reinforced with hot-dipzinc to prevent water corrosion and rust.8OutdoorantennaIt is recommended that at most three APs or antennas bemounted to the same pole. The APs or antennas mounted tothe same pole should meet the following requirements:lThe vertical distance should be at least 3.5 m betweenadjacent 2.4G antennas and 2 m between adjacent 5Gantennas.lThere should be at least 1 m vertical distance betweenantennas that work on the same frequency band andbelong to different APs.9OutdoorantennaWhen outdoor APs use single-polarized antennas, thehorizontal distance between 2.4G antennas should be at least1 m and that between 5G antennas should be at least 0.5 m.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.104
ComponentNo.ApplicableScopeCheck Item10 OutdoorantennaIf multiple APs are mounted to different poles, the APsshould provide signal coverage in the same direction or inback-to-back mode to ensure that main lobe of antennas ondifferent APs do not face each other.Recommended AP distance:≥ 44 m (APs provide signal coverage in the same direction)≥ 6 m (APs provide distance in back-to-back mode)Powerandgroundcables1 General The female connectors of power cables connecting to thedevice are fixed using a locking latch.2 General The power cables and ground cables are correctly connected.3 General The power cables and ground cables are complete and notspliced.4 GeneralThe excess of power cables or ground cables are trimmed offwithout any coils. The power cables connecting the deliveredsurge protection boxes and devices cannot be cut. Thesepower cables can be coiled.5 General Power cables and ground cable are separated from the signalcables.6 GeneralPower cables and ground cables are routed straightly andproperly bundled, with sufficient slack at the bend part. If thecables are fixed on a sharp mechanical part, take protectionmeasures.7 General The equipotential cables between the attaching cabinets shallbe securely connected.8 General The lugs for the power cables and ground cables are solderedor crimped securely.9 GeneralThe lugs and bare wires of power cables and ground cablesare tightly wrapped with tubes or insulation tape without anyexposed copper wire. Flat washers and spring washers areinstalled correctly.10 General Labels are filled and attached to power cables and groundcables correctly.11 General Power cables deployed outdoors must be covered by PVCtubes.Opticalmodule1 GeneralA single-mode fiber can only be used with a single-modeoptical module while a multimode optical fiber can only beused with a multimode optical module. On most opticalmodules, the fibers of different types cannot be used together.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.105
ComponentNo.ApplicableScopeCheck Item2 GeneralThe labels of pluggable optical modules are smoothlyattached and intact, and cannot be covered by the opticalmodules.3 GeneralIf a short-distance optical fiber is used for a long-distanceoptical module, especially in loopback scenarios, use anoptical attenuator to prevent the optical module from beingburnt.R250D-EHardware Installation and Maintenance Guide 5 AppendixIssue 01 (2016-09-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.106
R250D&R250D-E Product Description Issue 01 Date 2016-07-05 HUAWEI TECHNOLOGIES CO., LTD.
Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. i Copyright © Huawei Technologies Co., Ltd. 2016. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied. Huawei Technologies Co., Ltd. Address: Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China Website: http://e.huawei.com
R250D&R250D-E Product Description About This Document Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. ii About This Document Intended Audience This document describes the positioning, characteristics, hardware structure, product features, and technical specifications of the RU. This document helps you understand the characteristics and features of the RU. This document is intended for:  Network planning engineers  Hardware installation engineers  Commissioning engineer  Data configuration engineers  On-site maintenance engineers  Network monitoring engineers  System maintenance engineers Symbol Conventions The symbols that may be found in this document are defined as follows. Symbol Description Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. Indicates a potentially hazardous situation which, if not avoided, could result in equipment damage, data loss, performance deterioration, or unanticipated results. NOTICE is used to address practices not
R250D&R250D-E Product Description About This Document Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. iii Symbol Description related to personal injury. Calls attention to important information, best practices and tips. NOTE is used to address information not related to personal injury, equipment damage, and environment deterioration. Change History Changes between document issues are cumulative. The latest document issue contains all the changes made in previous issues. Changes in Issue 01 (2016-07-05) This is the initial commercial release.
R250D&R250D-E Product Description Contents Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. iv Contents About This Document .................................................................................................................... ii 1 Product Positioning and Characteristics ................................................................................... 1 1.1 Product Positioning ....................................................................................................................................................... 1 1.2 Product Characteristics ................................................................................................................................................. 2 2 Hardware Structure....................................................................................................................... 5 2.1 R250D ........................................................................................................................................................................... 5 2.2 R250D-E ....................................................................................................................................................................... 9 3 Product Features .......................................................................................................................... 13 3.1 WLAN Features .......................................................................................................................................................... 13 3.2 Network Features ........................................................................................................................................................ 14 3.3 QoS Features ............................................................................................................................................................... 14 3.4 Security Features ........................................................................................................................................................ 14 3.5 Maintenance Features ................................................................................................................................................. 15 3.6 BYOD ......................................................................................................................................................................... 15 3.7 Locating Service ......................................................................................................................................................... 15 3.8 Spectrum Analysis ...................................................................................................................................................... 16 4 Technical Specifications ............................................................................................................ 17 4.1 Basic Specifications .................................................................................................................................................... 17 4.2 Radio Specifications (R250D) .................................................................................................................................... 18 4.3 Radio Specifications (R250D-E) ................................................................................................................................ 22 4.4 Standards Compliance ................................................................................................................................................ 25
R250D&R250D-E Product Description 1 Product Positioning and Characteristics Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 1 1 Product Positioning and Characteristics 1.1 Product Positioning Product Overview The R250D and R250D-E are remote units (RUs) used in Huawei agile distributed Wi-Fi solution. They support PoE power supply, and are deployed indoors and connected to the central AP. The central AP and RUs are connected through network cables, which greatly extends the coverage range, enhances flexibility in AP deployment and planning, and reduces the engineering construction costs. The central AP manages the RUs and processes services in a centralized manner. The RUs process radio signals independently. Such distributed architecture further improves the wireless access capability, creating optimal service experience for users. The RU uses an 86 mm plate in compliance with international standards and can be easily installed into a junction box in a room. It is equipped with a built-in antenna and a hidden indicator; therefore, installation of the RU does not affect indoor decorations and designs. It also has an IEEE 802.11a/b/g/n/ac/ac wave2 wireless module and can work on both 5 GHz and 2.4 GHz frequency bands. The RU is recommended for environments with complex wall structures and high-density rooms, such as schools, hotels, hospitals, and office meeting rooms. Signals are transmitted through network cables without attenuation. The RUs are deployed indoors and provide comprehensive signal coverage. The RUs are managed by the central AP. The central AP and RUs are plug-and-play and can be managed and maintained in real time. Compared with traditional distributed AP solutions, the AC in Huawei agile distributed Wi-Fi solution needs to manage a smaller number of APs. A large number of RUs can be deployed, which improves the overall performance and reduces network deployment costs.
R250D&R250D-E Product Description 1 Product Positioning and Characteristics Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 2 Usage Scenario Figure 1-1 Distributed wireless access As shown in the figure, the downlink GE interfaces of the central AP support PoE power supply and can be directly connected to RUs. The central AP can connect to more RUs through a PoE switch. RUs are deployed indoors and communicate with the central AP through network cables. 1.2 Product Characteristics Long-Distance Network Coverage Unlike the traditional distributed AP which allows for a maximum feeder length of 15 m, the central AP uses network cables to replace feeder cables and supports up to 100 m distance from the RUs. The network coverage range is therefore expanded by several times. No Wall Penetration Loss, No Coverage Hole Restricted by feeder length or installation requirements, signals have to pass through walls in some scenarios, resulting in large signal attenuation. If rooms to be covered have complex structures, coverage holes may occur. To prevent these problems, lots of calculation and verification work needs to be carried out. Huawei distributed solution solves these problems. In this solution, RUs are placed in rooms, and signals are transmitted over wired cables, without wall penetration loss, delivering high-quality wireless access services.
R250D&R250D-E Product Description 1 Product Positioning and Characteristics Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3 802.11ac/ac wave2 Gigabit Wireless Rate The RU complies with IEEE 802.11a/b/g/n/ac/ac wave2, supports 2x2 MIMO, works on both 2.4 and 5 GHz frequency bands, and provides strong signals and gigabit wireless rate. Unique, Graceful Plate Design The RU is white in appearance and has heat emission holes and interfaces at the side and bottom. The mounting screws are hidden under the slide panel. The overall design is simple but graceful and blends well with the layout of hotels and apartments. Easy to Install in a Standard 86-type Box The RU uses an 86 mm plate in compliance with international standards and can be easily installed into a junction box in a room, requiring no drilling or cabling. Flexible Installation Modes In addition to an 86-type box, the R250D can be installed on a wall or ceiling, and the R250D-E can be installed on a desk, rendering the installation location flexible. Hidden Indicator, Zero Impact on Sleep The RU uses a hidden indicator design. When being turned on, the indicator has soft light. The AC controls the switch of the indicator and turns off the indicator at nights to prevent blinking lights from affecting sleep of guests. Four Downlink Ethernet Interfaces, Supporting Wired Access from Multiple Users The R250D-E has four downlink 1000M Ethernet interfaces that can process data concurrently. The interfaces can be connected to multiple terminals through network cables, such as the IPTV, desktop computer, and laptop, meeting requirements of hotels and apartments. One downlink 1000M Ethernet interface supports PoE out and can provide power supply for connected devices such as IP phones. Auto Shutdown of the Wired Interface In some cases, a loop may occur on a network connected to the RU's wired interface, for example, when the RU and the network are connected through a hub. The auto shutdown function enables the RU to automatically shut down its wired interface for protection. This function takes effect only when the wired network connected to the RU's wired interface does not terminate STP packets from the RU. Low Engineering Cost Compared with traditional distributed APs, the central AP cuts down the following expenses:  Construction: Network cables replace expensive feeder cables. The central AP can directly use the network cables originally routed in the rooms, without the need of deploying new cables.
R250D&R250D-E Product Description 1 Product Positioning and Characteristics Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 4  License: The maximum number of central APs in Fit AP mode allowed by the AC is controlled by licenses, but RUs do not require licenses. Therefore, one central AP can use RUs to cover dozens of rooms. Hierarchical Processing Technology, High Wireless Forwarding Capability Huawei distributed solution uses innovative hierarchical processing technology. The central AP manages RUs in a centralized manner and concurrently forwards service traffic, while the RUs only process radio signals. The hierarchical design makes the network structure clearer and reduces the processing burden on the central AP and RUs, improving efficiency and optimizing the overall wireless forwarding performance.
R250D&R250D-E Product Description 2 Hardware Structure Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 5 2 Hardware Structure 2.1 R250D Appearance The actual device appearance may be different from the following device appearance; these differences will not affect device functions. Figure 2-1 R250D appearance
R250D&R250D-E Product Description 2 Hardware Structure Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 6 Port Figure 2-2 R250D ports As shown in Figure 2-2, each port can be described as follows: 1. GE1: 10/100/1000M port: connects to the wired Ethernet. 2. Default: Reset button used to restore factory settings and restarts the device if you hold down the button more than 3 seconds. 3. GE0/PoE_IN: 10/100/1000M port: connects to the wired Ethernet and supports PoE input. The R250D provides only one indicator, as shown in Figure 2-3.
R250D&R250D-E Product Description 2 Hardware Structure Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 7 Figure 2-3 Indicator  The indicator is located inside the panel, which turns on after the AP is powered on.  Indicator colors may vary slightly at different temperature. Table 2-1 Indicator description Type Color Status Description Default status after power-on Green Steady on The AP is just powered on and the software is not started yet. Software startup status Green Steady on after blinking once After the system is reset and starts uploading the software, the indicator blinks green once. Until the software is uploaded and started, the indicator remains steady green. Running status Green Blinking once every 2s (0.5 Hz) The system is running properly, the Ethernet connection is normal, and STAs are associated with the AP.
R250D&R250D-E Product Description 2 Hardware Structure Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 8 Type Color Status Description Blinking once every 5s (0.2 Hz) The system is running properly, the Ethernet connection is normal, and no STA is associated with the AP. The system is in low power consumption state. Alarm Green Blinking once Alarm Green every 0.25s (4 Hz)  The software is being upgraded.  After the software is uploaded and started, the AP working in Fit AP mode requests to go online on the AC and maintains this state until it goes online successfully on the AC (before the CAPWAP link is established).  The AP registration fails (the CAPWAP link is disconnected). Fault Red Steady on A fault that affects services has occurred, such as a DRAM detection failure or system software loading failure. The fault cannot be automatically rectified and must be rectified manually.
R250D&R250D-E Product Description 2 Hardware Structure Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 9 2.2 R250D-E Appearance The actual device appearance may slightly differ from the following device appearance, but these differences will not affect device functions. Figure 2-4 AP2050DN-E appearance
R250D&R250D-E Product Description 2 Hardware Structure Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 10 Ports Figure 2-5 AP2050DN-E ports As shown in Figure 2-5, each port can be described as follows: 1. DC 48V: DC power socket: connects a 48V power adapter to the AP. 2. USB: Connects to a USB flash drive or other storage devices to extend the storage space of the AP. The USB2.0 standard is supported. 3. Default: Reset button: restores factory settings and restarts the device if you hold down the button more than 3 seconds. 4. Pass Through: Connects to a network cable or phone cable for transparent transmission. 5. GE2 to GE4: 10/100/1000M port: connects to the wired Ethernet. 6. GE1/PoE_OUT: 10/100/1000M port: connects to the wired Ethernet and supports PoE output. 7. GE0/PoE_IN: 10/100/1000M port: connects to the wired Ethernet and supports PoE input. LED Indicator The R250D-E provides only a single indicator, as shown in Figure 2-6.
R250D&R250D-E Product Description 2 Hardware Structure Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 11 Figure 2-6 Indicator  The indicator is located inside the panel, which turns on after the AP is powered on.  Indicator colors may vary slightly at different temperature. Table 2-2 Indicator description Type Color Status Description Default status after power-on Green Steady on The AP is just powered on and the software is not started yet. Software startup status Green Steady on after blinking once After the system is reset and starts uploading the software, the indicator blinks green once. Until the software is uploaded and started, the indicator remains steady green. Running status Green Blinking once every 2s (0.5 Hz) The system is running properly, the Ethernet connection is normal, and STAs are associated with the AP. Blinking once every 5s (0.2 Hz) The system is running properly, the Ethernet connection is
R250D&R250D-E Product Description 2 Hardware Structure Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 12 Type Color Status Description normal, and no STA is associated with the AP. The system is in low power consumption state. Alarm Green Blinking once Alarm Green every 0.25s (4 Hz)  The software is being upgraded.  After the software is uploaded and started, the AP working in Fit AP mode requests to go online on the AC and maintains this state until it goes online successfully on the AC (before the CAPWAP link is established).  The AP registration fails (the CAPWAP link is disconnected). Fault Red Steady on A fault that affects services has occurred, such as a DRAM detection failure or system software loading failure. The fault cannot be automatically rectified and must be rectified manually.
R250D&R250D-E Product Description 3 Product Features Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 13 3 Product Features 3.1 WLAN Features WLAN features supported by the AP are as follows:  Compliance with IEEE 802.11a/b/g/n/ac/ac Wave 2  Maximum rate of 1.167 Gbit/s  Maximum ratio combining (MRC)  Space time block code (STBC)  Beamforming  MU-MIMO  Low-density parity-check (LDPC)  Maximum-likelihood detection (MLD)  Frame aggregation, including A-MPDU (Tx/Rx) and A-MSDU (Rx only)  802.11 dynamic frequency selection (DFS)  Short guard interval (GI) in 20 MHz, 40 MHz, and 80 MHz modes  Priority mapping and packet scheduling based on a Wi-Fi Multimedia (WMM) profile to implement priority-based data processing and forwarding  Automatic and manual rate adjustment  WLAN channel management and channel rate adjustment For details about WLAN channel management, see the Country Code & Channel Compliance Table.  Automatic channel scanning and interference avoidance  Service set identifier (SSID) hiding  Signal sustain technology (SST)  Unscheduled automatic power save delivery (U-APSD)  Control and Provisioning of Wireless Access Points (CAPWAP)  Automatic login  Extended Service Set (ESS)  Multi-user CAC
R250D&R250D-E Product Description 3 Product Features Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 14 3.2 Network Features Network features supported by the AP are as follows:  Compliance with IEEE 802.3u  Auto-negotiation of the rate and duplex mode and automatic switchover between the Media Dependent Interface (MDI) and Media Dependent Interface Crossover (MDI-X)  Compliance with IEEE 802.1q  SSID-based VLAN assignment  VLAN trunk on uplink Ethernet ports  Management channel of the AP uplink port in tagged and untagged mode  DHCP client, obtaining IP addresses through DHCP  Tunnel data forwarding and direct data forwarding  STA isolation in the same VLAN  Access control lists (ACLs)  Link Layer Discovery Protocol (LLDP)  Uninterrupted service forwarding upon CAPWAP channel disconnection  Unified authentication on the AC  AC dual-link backup  IPv6 3.3 QoS Features QoS features supported by the AP are as follows:  Priority mapping and packet scheduling based on a Wi-Fi Multimedia (WMM) profile to implement priority-based data processing and forwarding  WMM parameter management for each radio  WMM power saving  Priority mapping for upstream packets and flow-based mapping for downstream packets  Queue mapping and scheduling  User-based bandwidth limiting  Adaptive bandwidth management (automatic bandwidth adjustment based on the user quantity and radio environment) to improve user experience  Airtime scheduling 3.4 Security Features Security features supported by the AP are as follows:  Open system authentication  WEP authentication/encryption using a 64-bit, 128-bit, or 152-bit encryption key  WPA/WPA2-PSK authentication and encryption (WPA/WPA2 personal edition)  WPA/WPA2-802.1x authentication and encryption (WPA/WPA2 enterprise edition)
R250D&R250D-E Product Description 3 Product Features Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 15  WPA-WPA2 hybrid authentication  WAPI authentication and encryption  Wireless intrusion detection system (WIDS) and wireless intrusion prevention system (WIPS), including rogue device detection and countermeasure, attack detection and dynamic blacklist, and STA/AP blacklist and whitelist  802.1x authentication, MAC address authentication, and Portal authentication  DHCP snooping  Dynamic ARP Inspection (DAI)  IP Source Guard (IPSG) 3.5 Maintenance Features Maintenance features supported by the AP are as follows:  Unified management and maintenance on the AC  Automatic login and configuration loading, and plug-and-play (PnP)  Batch upgrade  Telnet  STelnet using SSH v2  Real-time configuration monitoring and fast fault location using the NMS  System status alarm 3.6 BYOD BYOD features supported by the AP are as follows:  Identifies the device type according to the organizationally unique identifier (OUI) in the MAC address.  Identifies the device type according to the user agent (UA) information in an HTTP packet.  Identifies the device type according to DHCP options.  The RADIUS server delivers packet forwarding, security, and QoS policies according to the device type carried in the RADIUS authentication and accounting packets. 3.7 Locating Service The AP supports the locating service only in Fit AP mode. Locating service features supported by the AP are as follows:  Locates tags manufactured by AeroScout or Ekahau.  Locates Wi-Fi terminals.  Works with eSight to locate rogue devices.  The R250D-E supports Bluetooth location.
R250D&R250D-E Product Description 3 Product Features Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 16 3.8 Spectrum Analysis Spectrum analysis features supported by the AP are as follows:  Identifies interference sources such as baby monitors, Bluetooth devices, digital cordless phones (at 2.4 GHz frequency band only), wireless audio transmitters (at both the 2.4 GHz and 5 GHz frequency bands), wireless game controllers, and microwaves.  Works with eSight to locate and perform spectrum analysis on interference sources.
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 17 4 Technical Specifications 4.1 Basic Specifications Table 4-1 R250D Basic specifications Item Description Physical specifications Dimensions (H x W x D) 26 mm x 86 mm x 120 mm Weight 0.2 kg System memory  256 MB DDR3L  32MB Flash Power specifications Power input PoE power supply: in compliance with IEEE 802.3af/at Maximum power consumption 10.1 W NOTE The actual maximum power consumption depends on local laws and regulations. Environment specifications Operating temperature  -60 m to +1800 m: 0°C to +40°C  1800 m to 5000 m: Temperature decreases by 1°C every time the altitude increases 300 m. Storage temperature -40°C to +70°C Operating humidity 5% to 95% (non-condensing) IP rating IP20 Atmospheric pressure 53 kPa to 106 kPa
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 18 Table 4-2 R250D-E Basic specifications Item Description Physical specifications Dimensions (H x W x D) 36mm x 86mm x 140mm Weight 0.26kg System memory  256MB DDR3L  32MB FLASH Power specifications Power input  DC:48V±5%  PoE power supply: in compliance with IEEE 802.3af/at Maximum power consumption 11.5 W (excluding the output power of the USB port and PoE_OUT port) NOTE The actual maximum power consumption depends on local laws and regulations. Environment specifications Operating temperature  -60 m to +1800 m: 0°C to +40°C  1800 m to 5000 m: Temperature decreases by 1°C every time the altitude increases 300 m. Storage temperature -40°C to +70°C Operating humidity 5% to 95% (non-condensing) IP rating IP20 Atmospheric pressure 53 kPa to 106 kPa 4.2 Radio Specifications (R250D) Table 4-3 Radio specifications Item Description Antenna type Built-in antenna Antenna gain  2.4 GHz: 4 dBi(Typical)  5 GHz: 6 dBi(Typical) Maximum number of concurrent users ≤256
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 19 Item Description Maximum number of VAPs for each radio 16 Maximum transmit power  2.4 GHz: 21 dBm (combined power)  5 GHz: 20 dBm (combined power) NOTE The actual transmit power depends on local laws and regulations. You can adjust the transmit power from the maximum transmit power to 1 dBm, with a step of 1 dB. Maximum number of non-overlapping channels 2.4 GHz 802.11b/g  20 MHz: 3 802.11n  20 MHz: 3  40 MHz: 1 5 GHz  802.11a − 20 MHz: 13  802.11n − 20 MHz: 13 − 40 MHz: 6  802.11ac − 20 MHz: 13 − 40 MHz: 6 − 80 MHz: 3 NOTE The table uses the number of non-overlapping channels supported by China as an example. The number of non-overlapping channels varies in different countries. For details, see the Country Codes & Channels Compliance. Channel rate  802.11b: 1, 2, 5.5, and 11 Mbit/s  802.11a/g: 6, 9, 12, 18, 24, 36, 48, and 54 Mbit/s  802.11n: 6.5 to 300 Mbit/s  802.11ac: 6.5 to 867 Mbit/s Receiver sensitivity (Typical values) 2.4 GHz 802.11b  -99 dBm @ 1 Mbit/s  -97 dBm @ 2 Mbit/s  -95 dBm @ 5.5 Mbit/s  -92 dBm @ 11 Mbit/s 2.4 GHz 802.11g  -94 dBm @ 6 Mbit/s  -93 dBm @ 9 Mbit/s  -90 dBm @ 12 Mbit/s  -89 dBm @ 18 Mbit/s  -85 dBm @ 24 Mbit/s  -84 dBm @ 2.4 GHz 802.11n (HT20)  -93 dBm @ MCS0  -89 dBm @ MCS1  -87 dBm @ MCS2  -85 dBm @ MCS3  -82 dBm @ MCS4  -78 dBm @ 2.4 GHz 802.11n(HT40)  -91 dBm @ MCS0  -88 dBm @ MCS1  -85 dBm @ MCS2  -83 dBm @ MCS3  -80 dBm @ MCS4  -76 dBm @
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 20 Item Description 36 Mbit/s  -79 dBm @ 48 Mbit/s  -78 dBm @ 54 Mbit/s MCS5  -76 dBm @ MCS6  -74 dBm @ MCS7  -91 dBm @ MCS8  -87 dBm @ MCS9  -85 dBm @ MCS10  -83 dBm @ MCS11  -80 dBm @ MCS12  -76 dBm @ MCS13  -74 dBm @ MCS14  -72 dBm @ MCS15 MCS5  -75 dBm @ MCS6  -72 dBm @ MCS7  -89 dBm @ MCS8  -86 dBm @ MCS9  -83 dBm @ MCS10  -81 dBm @ MCS11  -78 dBm @ MCS12  -74 dBm @ MCS13  -73 dBm @ MCS14  -70 dBm @ MCS15 5 GHz 802.11a  -91 dBm @ 6 Mbit/s  -91 dBm @ 9 Mbit/s  -89 dBm @ 12 Mbit/s  -88 dBm @ 18 Mbit/s  -85 dBm @ 24 Mbit/s  -82 dBm @ 36 Mbit/s  -77 dBm @ 48 Mbit/s  -76 dBm @ 54 Mbit/s 5 GHz 802.11n (HT20)  -91 dBm @ MCS0  -88 dBm @ MCS1  -87 dBm @ MCS2  -84 dBm @ MCS3  -80 dBm @ MCS4  -76 dBm @ MCS5  -74 dBm @ MCS6  -72 dBm @ MCS7  -89 dBm @ MCS8  -86 dBm @ MCS9  -85 dBm @ MCS10 5 GHz 802.11n (HT40)  -88 dBm @ MCS0  -86 dBm @ MCS1  -82 dBm @ MCS2  -80 dBm @ MCS3  -77 dBm @ MCS4  -73 dBm @ MCS5  -71 dBm @ MCS6  -69 dBm @ MCS7  -86 dBm @ MCS8  -84 dBm @ MCS9  -80 dBm @ MCS10 -
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 21 Item Description  -82 dBm @ MCS11  -78 dBm @ MCS12  -74 dBm @ MCS13  -72 dBm @ MCS14  -70 dBm @ MCS15  -78 dBm @ MCS11  -75 dBm @ MCS12  -71 dBm @ MCS13  -69 dBm @ MCS14  -67 dBm @ MCS15 5 GHz 802.11ac (VHT20)  -91 dBm @ MCS0NSS1  -88 dBm @ MCS1NSS1  -87 dBm @ MCS2NSS1  -83 dBm @ MCS3NSS1  -80 dBm @ MCS4NSS1  -76 dBm @ MCS5NSS1  -74 dBm @ MCS6NSS1  -72 dBm @ MCS7NSS1  -69 dBm @ MCS8NSS1  -89 dBm @ MCS0NSS2  -86 dBm @ MCS1NSS2  -85 dBm @ MCS2NSS2  -81 dBm @ MCS3NSS2  -78 dBm @ MCS4NSS2  -74 dBm @ MCS5NSS2  -72 dBm @ MCS6NSS2 5 GHz 802.11ac (VHT40)  -88 dBm @ MCS0NSS1  -85 dBm @ MCS1NSS1  -82 dBm @ MCS2NSS1  -80 dBm @ MCS3NSS1  -77 dBm @ MCS4NSS1  -73 dBm @ MCS5NSS1  -71 dBm @ MCS6NSS1  -69 dBm @ MCS7NSS1  -66 dBm @ MCS8NSS1  -64 dBm @ MCS9NSS1  -86 dBm @ MCS0NSS2  -83 dBm @ MCS1NSS2  -80 dBm @ MCS2NSS2  -78 dBm @ MCS3NSS2  -75 dBm @ MCS4NSS2  -71 dBm @ MCS5NSS2 5 GHz 802.11ac (VHT80)  -85 dBm @ MCS0NSS1  -82 dBm @ MCS1NSS1  -79 dBm @ MCS2NSS1  -77 dBm @ MCS3NSS1  -74 dBm @ MCS4NSS1  -70 dBm @ MCS5NSS1  -68 dBm @ MCS6NSS1  -67 dBm @ MCS7NSS1  -62 dBm @ MCS8NSS1  -61 dBm @ MCS9NSS1  -83 dBm @ MCS0NSS2  -80 dBm @ MCS1NSS2  -77 dBm @ MCS2NSS2  -75 dBm @ MCS3NSS2  -72 dBm @ MCS4NSS2  -68 dBm @ MCS5NSS2 -
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 22 Item Description  -70 dBm @ MCS7NSS2  -67 dBm @ MCS8NSS2  -69 dBm @ MCS6NSS2  -67 dBm @ MCS7NSS2  -64 dBm @ MCS8NSS2  -62 dBm @ MCS9NSS2  -66 dBm @ MCS6NSS2  -65 dBm @ MCS7NSS2  -60 dBm @ MCS8NSS2  -59 dBm @ MCS9NSS2 4.3 Radio Specifications (R250D-E) Table 4-4 Radio specifications Item Description Antenna type Built-in antenna Antenna gain  2.4 GHz: 4 dBi(Typical)  5 GHz: 5 dBi(Typical) Maximum number of concurrent users ≤256 Maximum number of VAPs for each radio 16 Maximum transmit power  2.4 GHz: 21 dBm (combined power)  5 GHz: 20 dBm (combined power) NOTE The actual transmit power depends on local laws and regulations. You can adjust the transmit power from the maximum transmit power to 1 dBm, with a step of 1 dB. Maximum number of non-overlapping channels 2.4 GHz 802.11b/g  20 MHz: 3 802.11n  20 MHz: 3  40 MHz: 1 5 GHz  802.11a − 20 MHz: 13  802.11n − 20 MHz: 13 − 40 MHz: NOTE The table uses the number of non-overlapping channels supported by China as an example. The number of non-overlapping channels varies in different countries. For details, see the Country Codes & Channels Compliance.
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 23 Item Description 6  802.11ac − 20 MHz: 13 − 40 MHz: 6 − 80 MHz: 3 Channel rate  802.11b: 1, 2, 5.5, and 11 Mbit/s  802.11a/g: 6, 9, 12, 18, 24, 36, 48, and 54 Mbit/s  802.11n: 6.5 to 300 Mbit/s  802.11ac: 6.5 to 867 Mbit/s Receiver sensitivity (Typical values) 2.4 GHz 802.11b  -97 dBm @ 1 Mbit/s  -95 dBm @ 2 Mbit/s  -94 dBm @ 5.5 Mbit/s  -91 dBm @ 11 Mbit/s 2.4 GHz 802.11g  -93 dBm @ 6 Mbit/s  -92 dBm @ 9 Mbit/s  -90 dBm @ 12 Mbit/s  -89 dBm @ 18 Mbit/s  -87 dBm @ 24 Mbit/s  -84 dBm @ 36 Mbit/s  -80 dBm @ 48 Mbit/s  -78 dBm @ 54 Mbit/s 2.4 GHz 802.11n (HT20)  -93 dBm @ MCS0  -89 dBm @ MCS1  -88 dBm @ MCS2  -85 dBm @ MCS3  -82 dBm @ MCS4  -78 dBm @ MCS5  -76 dBm @ MCS6  -74 dBm @ MCS7  -91 dBm @ MCS8  -87 dBm @ MCS9  -86 dBm @ MCS10  -83 dBm @ MCS11  -80 dBm @ MCS12  -76 dBm @ MCS13  -74 dBm @ MCS14 2.4 GHz 802.11n(HT40)  -90 dBm @ MCS0  -87 dBm @ MCS1  -86 dBm @ MCS2  -83 dBm @ MCS3  -79 dBm @ MCS4  -75 dBm @ MCS5  -74 dBm @ MCS6  -73 dBm @ MCS7  -88 dBm @ MCS8  -85 dBm @ MCS9  -84 dBm @ MCS10  -81 dBm @ MCS11  -77 dBm @ MCS12  -73 dBm @ MCS13  -72 dBm @ MCS14
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 24 Item Description  -72 dBm @ MCS15  -71 dBm @ MCS15 5 GHz 802.11a  -93 dBm @ 6 Mbit/s  -92 dBm @ 9 Mbit/s  -90 dBm @ 12 Mbit/s  -89 dBm @ 18 Mbit/s  -87 dBm @ 24 Mbit/s  -82 dBm @ 36 Mbit/s  -79 dBm @ 48 Mbit/s  -77 dBm @ 54 Mbit/s 5 GHz 802.11n (HT20)  -92 dBm @ MCS0  -90 dBm @ MCS1  -88 dBm @ MCS2  -85 dBm @ MCS3  -81 dBm @ MCS4  -77 dBm @ MCS5  -75 dBm @ MCS6  -74 dBm @ MCS7  -90 dBm @ MCS8  -88 dBm @ MCS9  -86 dBm @ MCS10  -83 dBm @ MCS11  -79 dBm @ MCS12  -75 dBm @ MCS13  -73 dBm @ MCS14  -72 dBm @ MCS15 5 GHz 802.11n (HT40)  -89 dBm @ MCS0  -87 dBm @ MCS1  -85 dBm @ MCS2  -82 dBm @ MCS3  -79 dBm @ MCS4  -75 dBm @ MCS5  -73 dBm @ MCS6  -72 dBm @ MCS7  -87 dBm @ MCS8  -85 dBm @ MCS9  -83 dBm @ MCS10  -80 dBm @ MCS11  -77 dBm @ MCS12  -73 dBm @ MCS13  -71 dBm @ MCS14  -70 dBm @ MCS15 - 5 GHz 802.11ac (VHT20)  -92 dBm @ MCS0NSS1  -90 dBm @ MCS1NSS1  -87 dBm @ MCS2NSS1 5 GHz 802.11ac (VHT40)  -90 dBm @ MCS0NSS1  -87 dBm @ MCS1NSS1  -85 dBm @ MCS2NSS1 5 GHz 802.11ac (VHT80)  -86 dBm @ MCS0NSS1  -83 dBm @ MCS1NSS1  -81 dBm @ MCS2NSS1 -
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 25 Item Description  -84 dBm @ MCS3NSS1  -81 dBm @ MCS4NSS1  -77 dBm @ MCS5NSS1  -75 dBm @ MCS6NSS1  -73 dBm @ MCS7NSS1  -69 dBm @ MCS8NSS1  -90 dBm @ MCS0NSS2  -90 dBm @ MCS1NSS2  -88 dBm @ MCS2NSS2  -85 dBm @ MCS3NSS2  -82 dBm @ MCS4NSS2  -79 dBm @ MCS5NSS2  -75 dBm @ MCS6NSS2  -73 dBm @ MCS7NSS2  -71 dBm @ MCS8NSS2  -81 dBm @ MCS3NSS1  -78 dBm @ MCS4NSS1  -74 dBm @ MCS5NSS1  -73 dBm @ MCS6NSS1  -71 dBm @ MCS7NSS1  -67 dBm @ MCS8NSS1  -65 dBm @ MCS9NSS1  -88 dBm @ MCS0NSS2  -85 dBm @ MCS1NSS2  -83 dBm @ MCS2NSS2  -79 dBm @ MCS3NSS2  -76 dBm @ MCS4NSS2  -72 dBm @ MCS5NSS2  -71 dBm @ MCS6NSS2  -69 dBm @ MCS7NSS2  -65 dBm @ MCS8NSS2  -63 dBm @ MCS9NSS2  -79 dBm @ MCS3NSS1  -76 dBm @ MCS4NSS1  -71 dBm @ MCS5NSS1  -70 dBm @ MCS6NSS1  -68 dBm @ MCS7NSS1  -65 dBm @ MCS8NSS1  -62 dBm @ MCS9NSS1  -84 dBm @ MCS0NSS2  -81 dBm @ MCS1NSS2  -79 dBm @ MCS2NSS2  -77 dBm @ MCS3NSS2  -74 dBm @ MCS4NSS2  -69 dBm @ MCS5NSS2  -68 dBm @ MCS6NSS2  -66 dBm @ MCS7NSS2  -63 dBm @ MCS8NSS2  -60 dBm @ MCS9NSS2 4.4 Standards Compliance Safety standards  UL 60950–1  IEC 60950–1  EN 60950–1  GB 4943
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 26 Radio standards  ETSI EN 300 328  ETSI EN 301 893  FCC Part 15C: 15.247  FCC Part 15C: 15.407  RSS-210  AS/NZS 4268 EMC standards  EN 301 489–1  EN 301 489–17  ETSI EN 60601-1-2  FCC Part 15  ICES-003  YD/T 1312.2-2004  ITU k.21  GB 9254  GB 17625.1  EN 55022  EN 55024  CISPR 22  CISPR 24  IEC61000-4-6  IEC61000-4-2 IEEE standards  IEEE 802.11a/b/g  IEEE 802.11n  IEEE 802.11ac  IEEE 802.11h  IEEE 802.11d  IEEE 802.11e Security Standards  802.11i, Wi-Fi Protected Access 2 (WPA2), and WPA  802.1X  Advanced Encryption Standards (AES) and Temporal Key Integrity Protocol (TKIP)  EAP Type (s) Environment Standards  ETSI 300 019-2-1  ETSI 300 019-2-2
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 27  ETSI 300 019-2-3  ETSI 300 019-1-1  ETSI 300 019-1-2  ETSI 300 019-1-3 EMF  CENELEC EN 62311  CENELEC EN 50385  RSS-102  FCC Part1&2  FCC KDB RoHS  Directive 2002/95/EC & 2011/65/EU Reach  Regulation 1907/2006/EC WEEE  Directive 2002/96/EC & 2012/19/EU FCC Statement  This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: —Reorient or relocate the receiving antenna. —Increase the separation between the equipment and receiver. —Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. —Consult the dealer or an experienced radio/TV technician for help. FCC Radiation Exposure Statement  This device complies with FCC radiation exposure limits set forth for an uncontrolled environment and it also complies with Part 15 of the FCC RF Rules. This equipment must be installed and operated in accordance with provided instructions and the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter. End-users and installers must be provide with antenna installation instructions and consider removing the no-collocation statement. This device complies with Part 15 of the FCC Rules. Operation is subject to the
R250D&R250D-E Product Description 4 Technical Specifications Issue 01 (2016-07-05) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 28 following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Caution!  Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

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