Sanyo Electric Co NPM-2000-C310 NPM-2000 Wireless Base Station User Manual NPM2 Installation Procedures 1600 mmds NPM2

Sanyo Electric Co Ltd NPM-2000 Wireless Base Station NPM2 Installation Procedures 1600 mmds NPM2

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Users Manul Part III

2006/8/3 Part ####### revision 001 83Chapter 5Chapter 5ANTENNA INSTALLATION PROCEDURESThis chapter provides an overview of the installation process. Please familiarize yourself with the instal-lation process in general before proceeding to the next chapter.ContentsInstall the Main and Diversity Antennas ........................................................................................................ 84Measuring VSWR and Return Loss .............................................................................................................. 88 Measuring the Distance to a Fault ................................................................................................................ 90
Antenna Installation Procedures2006/8/3 Part ####### revision 001 84INSTALL THE MAIN AND DIVERSITY ANTENNASThese procedures describe the general process for installing the main and diversity antennas. Consult your field enginnering package for any site-specific antenna installation requirements.Before You BeginBefore you install the antennas:Select an installation location away from any objects that might obstruct the RF signals. Although the base station has non-line-of-site RF capability, obstructions may reduce the strength of the transmission or reception signals.Ensure that the type and length of cabling used to connect the main and diversity antennas to the radio module meet your attenuation and shielding requirements.Cabling and ConnectorsFigure 5.1 shows the main and diversity antenna cabling and connectors.WARNING:Before proceeding with the installation of the antennas, consult theapplicable local code of wiring for requirements, including: clearance from power andlightning conductors, proper mounting methods, and antenna grounding.
85 Part ####### revision 001 2006/8/3Macro Base Station Installation Procedures (NPM2000)Figure 5.1Radio Module with TT-LNA Antenna ConfigurationTo install the main and diversity antennas1Verify that you have the right type of antennas, both in terms of frequency and direction.2Run the antenna cable from the rack to the intended location of each antenna.1235791011121315161718192021TT-LNA Power Cable
Antenna Installation Procedures2006/8/3 Part ####### revision 001 86NOTE:Ensure that the cable remains clear of any sources of potential interference, such as transmitting equipment or power lines.Figure 5.2 shows the radio module antenna connectors on the rack.Figure 5.2Radio Module Antenna Connections3Attach each antenna to your tower or building using the required mounting hardware.4Orient each antenna to the correct azimuth (direction) and tilt.5Tighten and secure each antenna.6Connect the antenna to the radio module:iInstall each TT-LNA within 3 m (10 feet) of its antenna. The TT-LNAs should be installed as close to the antennas as possible in order to ensure optimal base station performance. Consult the docu-mentation that ships with the TT-LNAs for the correct mounting procedures.!CAUTION:Failure to orient the antennas may seriously affect the performanceof your wireless network.1235791011121315161718192021
87 Part ####### revision 001 2006/8/3Macro Base Station Installation Procedures (NPM2000)ii Connect the Antenna (ANT) port on each TT-LNA to its antenna using a suitable coaxial cable. Torque each 7/16 DIN connector to 28.0 N•m (247.8 inch-pounds) and ensure each connector is properly weatherproofed.iii Install each CIN (also called a bias tee) inside or outside the base station building. Connect the ANT port on each CIN to the Base Transfer Station (BTS) port on each TT-LNA. Torque each 7/16 DIN connector to 28.0 N•m (247.8 inch-pounds) and ensure each connector is properly weatherproofed.NOTE:Ensure that each CIN is installed within 10 m (32 feet) from the base station. iv Connect the BTS on each CIN to the ANT port on each radio module. The ANT port is located on the rear side of the radio module.vConnect the DC port on each CIN to the EXT/LNA port on each radio module. The EXT/LNA port is located on the rear side of the radio module.!CAUTION:Do not over-tighten connectors. Overtightening the connectors maydamage the cable and degrade the RF signal.!CAUTION:Do not over-tighten connectors. Overtightening the connectors maydamage the cable and degrade the RF signal.
Antenna Installation Procedures2006/8/3 Part ####### revision 001 88MEASURING VSWR AND RETURN LOSSVoltage standing wave ratio (VSWR) is a ratio of the maximum to minimum voltage as measured along the length of a mismatched RF transmission line. VSWR indicates the level of impedance matching between RF equipment (such as amplifiers, cabling, and antennas). When the impedances of the RF equipment are mismatched, some of the RF energy is reflected back along the transmission line.Reflected energy causes inefficiencies in the transmission power output. A VSWR of 1:1, as measured from antenna cable to the antenna, indicates that 100% of the power output is being radiated by the antenna. During a cable sweep, RF equipment should show a VSWR of 1.5:1 or less, as measured from 2500-2686 MHz. A VSWR greater than 1.5:1 indicates potential problems with the RF equipment.A high VSWR may be caused by one or more of the following conditions:Moisture in the external cables or connectorsFaulty equipmentPoor connections between componentsDamaged cables or connectorsAn open- or short-circuit in RF equipment or cablesReturn LossReturn loss is closely related to VSWR. Return loss is a measure in decibels (dB) of the ratio of forward to reflected power. For example, if a load has a return loss of 10 dB, then 1/10 of the forward power is reflected. The higher the return loss, the less energy is being reflected.Table 5.1 shows the correlation between VSWR, return loss, and the percentage of reflected power.To measure the VSWR of RF equipment1Power on and calibrate your cable sweep analyzer.2Power off the radio module connected to the RF equipment you want to test. See page 93 for a list of cir-cuit breakers.VSWR Return Loss (dB) Power Being Reflected (%)1:1 N/A (infinite value) 01.25:1 19.1 1.21.5:1 14 4.01.75:1 11.3 7.42:1 9.5 11.15:1 3.5 44.7N/A (infinite value) 0 100.0Table 5.1VSWR, Return Loss, and Reflected Power Conversions
89 Part ####### revision 001 2006/8/3Macro Base Station Installation Procedures (NPM2000)3Carefully disconnect the RF equipment and cables you want to test.4Connect the cable sweep analyzer to the equipment and cables you want to test.NOTE:Be careful not to damage any cables or connectors when connecting the analyzer to the RF equipment. Due to the use of the tower-top low noise amplifier (TT-LNA), all cable sweeps must measure the total length of the cable run (including all connectors, jumpers, and CIN), using a DIN adapter (female-female) in place of the TT-LNA.5Perform the cable sweeps.See the documentation that comes with your analyzer for information about performing the cable sweep and interpreting the results.6Record the results from the cable sweeps. Keeping records of periodic cable sweeps makes trouble-shooting future problems easier.7Carefully disconnect the analyzer from the RF equipment.8Reconnect the RF equipment and cables back to the radio module.9If any of the connectors are outdoors, ensure that they are resealed according to the procedures of your site.10 Reconnect the RF equipment to the radio module.11 Power on the radio module. See page 93 for a list of circuit breakers.!WARNING:Extreme care must be taken when connecting or disconnecting thecoaxial antenna cable to avoid damage to the center pins. Connectors should betorqued to a maximum of 28.0 N•m (247.8 inch-pounds) and be free of dirt or moisture.Do not over-torque the connectors as this can damage the center pin and cause cablefaults and other RF problems.
Antenna Installation Procedures2006/8/3 Part ####### revision 001 90MEASURING THE DISTANCE TO A FAULTDistance to fault (DTF) is a measurement of VSWR or return loss based on distance. A DTF test indi-cates the distance to a short, open, or load. Perform a DTF test whenever a VSWR test reveals that the antenna system is not operating within specifications.To accurately interpret the results from a DTF cable sweep, you need to know the lengths of your cables and the location of any devices or connectors attached to those cables. Comparing the results of the test with the layout of your antenna system will help you to determine if problems are caused by faulty devices, connectors, or cables.To measure the distance to fault1Power on and calibrate your cable sweep analyzer.2Power off the radio module connected to the RF equipment you want to test. See page 93 for a list of cir-cuit breakers.3Carefully disconnect the RF equipment and cables you want to test.4Connect the cable sweep analyzer to the equipment and cables you want to test.NOTE:Be careful not to damage any cables or connectors when connecting the analyzer to the RF equipment.5Perform the cable sweeps.See the documentation that comes with your analyzer for information about performing the cable sweep and interpreting the results.6Document the results from the cable sweeps.Keeping records of periodic cable sweeps will make troubleshooting future problems easier.7Carefully disconnect the analyzer from the RF equipment.8Reconnect the RF equipment and cables back to the radio module.If any of the connectors are outdoors, ensure that they are resealed according to the procedures of your site.9Power on the radio module. See page 93 for a list of circuit breakers.
2006/8/3 Part ####### revision 001 91Chapter 6Chapter 6ON-SITE CONFIGURATION PROCEDURESThis chapter describes how to power on the base station and configure the cards.ContentsPower On the Base Station ........................................................................................................................... 92
On-Site Configuration Procedures2006/8/3 Part ####### revision 001 92Power On the Base StationThe power for the NPM2000 base station is controlled by circuit breakers in the PDP, located at the top of the rack. digital shelf has its own circuit breaker, whereas radio module has its own fuse.To power on the base station1Ensure that your main –48V DC power supply is powered on and is providing a power source that meets the electrical requirements listed on page 23.2Ensure that Power-A LED and Power-B LED on the front panel of PDP are lighted.3Set all except those for non-installed radio modules and routers to the ON (up) position on the PDP.4Power on the power supply in the digital shelf. Figure 6.1 shows the circuit breakers on the digital shelf.Figure 6.1Circuit Breakers on the Digital ShelfiThe PWR GOOD LED near each power connector should illuminates. This indicates that the power source is providing voltage on that feed. If one of these LEDs is not illuminated, check the cabling and the power source for that feed.ii Switch all four circuit breakers to the ON position. It is suggested that you switch on both circuit breakers on one FlexAlarm unit, and then switch on both circuit breakers on the other FlexAlarm unit.
93 Part ####### revision 001 2006/8/3Macro Base Station Installation Procedures (NPM2000)The FlexCool fan units will begin cooling the chassis and the FlexManager cards will boot automatically.Table 6.1 shows the circuit breakers for each power supply.5Power on each radio module separately. Table 6.1 shows the circuit breakers for the radio module.Figure 6.2 shows the circuit breakers on the PDP front panel.Figure 6.2Circuit Breakers on the PDP Front Panel!CAUTION:After powering up the system, check the fanstatus LEDs to make sure that the ventilating fans are opera-tional. Origin Termination Origin TerminationRM 1M (CBA1) Radio Module Shelf, RM 1-MRM 1D (CBB1) Radio Module Shelf, RM 1-DRM 2M (CBA2) Radio Module Shelf, RM 2-MRM 2D (CBB2) Radio Module Shelf, RM 2-D CPCI A1 (CBA7) Digital Shelf FlexAlarm A 1-10RM 3M (CBA3) Radio Module Shelf, RM 3-M CPCI A2 (CBA8) Digital Shelf FlexAlarm A 11-21RM 3D (CBB3) Radio Module Shelf, RM 3-D CPCI B1 (CBB7) Digital Shelf FlexAlarm B 1-10RM 4M (CBA4) Radio Module Shelf, RM 4-M CPCI B2 (CBB8) Digital Shelf FlexAlarm B 11-21RM 4D (CBB4) Radio Module Shelf, RM 4-D RT A OptionRT B OptionTable 6.1Circuit BreakersF1
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95 Part ####### revision 001 2006/8/3Macro Base Station Installation Procedures (NPM2000)Appendix AAppendix ADECOMMISSIONING PROCEDURESThis appendi describes how to safely take an base station out of service.ContentsDecommission a Base Station ............................................................................................................................
On-Site Configuration Procedures2006/8/3 Part ####### revision 001 96Decommission a Base StationDecommissioning occurs whenever a base station is taken out of service or moved to a new location.To decommission a base station1Shutdown the sector controllers:iEstablish an SSH session with each card, as described in the System Administration Reference.ii Shutdown each card by typing:shutdown now ↵2Shutdown the digital shelf by setting all slots to off.iSet all slots to off by typing the following command on the active FlexManager:off3Power off the base station by setting all breakers except those for non-installed radio modules and rout-ers to the OFF (down) position.4Power off the main power supply for the base station. With most power bays, circuit breakers control the –48V DC feeds to the rack. Ensure that the main power is removed for the rack.See the documentation that accompanies your main power supply for specific instructions on powering off the –48V DC feeds to the base station. After the main power supply is powered off, it is safe to prepare the rack for shipment or storage.5Package the rack according to the procedures specific to your site. If you remove the cards from the dig-ital shelf, ensure that the cards are stored in antistatic packaging and that the required documentation is included.WARNING:Ensure that the necessary requirements and procedures have beenreviewed prior to the start of any power-related activity. Refer to your cut-over MOP forprocedures specific to your site.
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On-Site Configuration Procedures2006/8/3 Part ####### revision 001 98Appendix BAppendix BADDING ADDITIONAL SECTORSThis appendix describes how to add additional sectors to an base station to increase capacity.ContentsPre-Upgrade Preparation....................................................................................................................................Adding Sectors to a Base StationPerforming the Cutover and Power-OnAcceptance Test Plan for Base Station Upgrade
99 Part ####### revision 001 2006/8/3Macro Base Station Installation Procedures (NPM2000)Pre-Upgrade PreparationBefore you begin upgrading the base station, ensure that the following preparations are performed. These preparations are intended to minimize the interruption of service.Site-Specific DocumentationBefore upgrading the base station, ensure that the documentation described in Table B.1 is updated, reviewed, and verified.RF PlanningRF planners should develop a preliminary RF plot of the new sector configuration that accounts for the location of existing and future users. A change in antenna sector layout may affect the RF planning for the entire network.After the RF plot is finalized, it shoud be added to the field engineering package.Install Additional Antennas and CablingInstall the new antennas and associated cabling. Each new sector requires two antennas (main and diversity). See “Install the Main and Diversity Antennas" on page for information.After installing the antennas and cabling, perform a cable sweep on each and ensure results are within specifications.HVAC RequirementsEnsure that the heating, ventilation, and air-conditioning (HVAC) system for the site has the capacity to handle the additional heat produced by the additional sectors. See “Heat Output" on page for infor-mation.Main and Backup Power SuppliesEnsure that the power supplies for the site have the capacity to handle the additional sectors. See "Electrical Requirements" on page for information. Additional rectifier must be installed and tested prior to upgrading.Document DescriptionField engineering package Provides site-specific configuration about the base station, such as antenna orienta-tion, cabling requirements, and inventory.Method of Procedure (MOP) for adding sectors Describes the sequence and timing of procedures required for the upgradeSite-specific fall-back plan Describes any events or triggers that require that the technicians return the base station to its original configuration.Table B.1Sector Upgrade Documentation Requirements
On-Site Configuration Procedures2006/8/3 Part ####### revision 001 100Backhaul CapacityVerify that the backhaul connecting the base station to the network core has the capacity to handle the additional traffic.Edge and Core Router CapacityIf the backhaul is upgraded, the edge and core routers may require changes to their physical interface cards (PIC). Any change must be implemented and tested prior to upgrading.
101 Part ####### revision 001 2006/8/3Macro Base Station Installation Procedures (NPM2000)Adding Sectors to a Base StationThis procedure describes how to add additional sectors to a base station. See your updated field engi-neering package for site-specific information about the upgrade.To add sectors to a base station1Install any additional radio modules. See "To insert the radio modules in the rack" on page 62.2Install any additional CompactPCI power supplies for the radio shelves See "To insert CompactPCI power supplies" on page 67.3Install the additional cards. See "To insert the cards into the digital shelf" on page 70.4Cover any unused card slots with filler panels. See "To cover the unused slots with filler panels" on page 72.5Install the power, Ethernet, signal, and RF cabling for the new sectors. See "Connecting the Cables" on page 73.6Perform a quality audit on the base station hardware as described in the field deployment (E1) package.7Review the condition of the status lights to ensure correct operation. See the Macro Base Station Mainte-nance Procedures for information.8Add the new sectors to the base station network in the CM tool. See the Base Station Provisioning Pro-cedures (NPM2000) for information.
On-Site Configuration Procedures2006/8/3 Part ####### revision 001 102Performing the Cutover and Power-OnSwitching to the new antenna configuration will result in a service interruption. The cutover should occur during a scheduled maintenance window.To perform the cutover and power-on1Power off the radio modules. See "Power On the Base Station" on page 92 for information about radio module circuit breakers.2Disconnect the antenna cables from the old antennas.3Connect the new antennas.4Power on the radio modules.5Peform the acceptance test plan (ATP) to ensure correct operation and functionality. See!CAUTION:Before performing this procedure, ensure that a quality audit has beenperformed on the system, as described in "Adding Sectors to a Base Station" on page101.This procedure will cause a service interruption. During this procedure, all SOMAportsin the affected sectors will be forced to reacquire.Estimated time of service interruption: 10 minEstimated time to completion: 30 min
103 Part ####### revision 001 2006/8/3Macro Base Station Installation Procedures (NPM2000)Acceptance Test Plan for Base Station UpgradeAfter completing the upgrade, review the acceptance test plan (ATP) to verify the functionality and performance of the new configuration.Site Coverage VerificationImmediately after performing the cutover and quality audit, verify the RF site coverage to identify pos-sible problems with the antenna subsystem, such as antenna radiation patterns, azimuth, tilt, or cabling errors.Coverage verification includes performing a drive test on non-service-affecting channels, such as the pilot channel (PICH). Service interrput may be required if adjustments to the antenna subsystem are required.Voice and Data Functionality and PerformanceThe ATP should include procedures that test the functionality and performance of the voice and data services.RF Network Coverage OptimizationRF network coverage optimization should be performed after the upgrade is completed for all planned sites within the market area in order to secure high service quality and subscriber satisfaction.Network optimization typically requires:Monitoring network statistics to identify areas or users with service quality degradationDrive testing (pilot channel scan) to identify areas with coverage problemsCollected data should be analyzed and, if necessary, appropriate site configuration changes imple-mented (such as antenna orientation, down tilt, base station power setting, individual channel power allocation, or parameter tuning).In situations where a configuration change for a large number of sites is planned, sector upgrades should occur in several phases. The entire network should be divided in clusters of sites and sectoriza-tion performed for each cluster individually. Coverage optimization should be performed for each cluster after sectorization is completed. Network wide optimization will be performed after entire net-work is reconfigured.
2006/8/3 Part ####### revision 001 104Aair interfaceThe standards governing radio transmission between two elements of a wireless system, such as a base station and a SOMAport.The interface typically specifies the frequency band (for example, PCS), multiple-access scheme (for example, CDMA), modulation scheme and coding (for example, QPSK and rate 1/2), power control mechanisms, and proto-cols for setting up and managing communications.attenumationThe reduction of signal magnitude over a medium. Attenua-tion is usually measured in dB per unit of distance, or as a ratio of input to output magnitude in dB. The less the atten-uation, the more efficient the medium.Attenuation is also called signal loss.AWG (American wire gauge)A standard for measuring wire thickness. The thicker the wire, the smaller AWG it has and typically, the higher cur-rent it can carry.BbackhaulThe network or service that connects remote devices, such as base stations, to the central office. In the SOMA Networks implementation, backhaul refers to the wireline link between the base station and the network core. base stationEquipment deployed by service providers at the center of each cell to communicate with wireless devices. In a SOMA network, the base station communicates with wireless sub-scriber terminals called SOMAports.BIOS (basic input/output system)Software, typically stored in nonvolatile memory, that pro-vides a standardized interface between a computer’s hard-ware and the operating system.busAn electrical pathway that connects several devices and pro-vides addressing and data-transfer capabilities.CCDMA (code-division multiple access)A cellular technology that divides a frequency into multiple channels by assigning a pseudo-random digital seuence, or code, to each. CDMA does not assign a specific frequency to each user. Instead, every channel uses the full available spec-trum.cellularA communications system, originally AMPS, that divides a geographic area into cells, each of which has its own radio transmitters and receivers. Competing digital cellular sys-tems include GSM and CDMA.CompactPCIAn open, industry-standard architecture based on the PCI architecture. Electrically, CompactPCI is superset of PCI. CompactPCI cards use Eurocard form factors and are typi-cally available in 3U and 6U formats.The CompactPCI standard is controlled the PCI Industrial Computer Manufacturers Group (PICMG).core networkGenerically, the physical infrastructure at the center of a net-work with a single administrative entity.See also "network core".DdB (decibel)A logarithmic expression of the ratio of two electrical equali-ties. To calculate dB, use the formula: Sdb=10log (P2/P1). EE1 PackageA SOMA Networks document that provides installation and operation instructions for a specific site.EthernetA LAN protocol that uses CSMA/CD and a bus topology to support data transfer at 10Mbits/s.Chapter 0GLOSSARY
105 Part ######## revision 001 2006/8/3Macro Base Station Installation Procedures (NPM2000)A newer version, called Fast Ethernet or 100Base-T, supports data transfer at 100 Mbits/s, and the IEEE has developed a standard for so-called Gigabit Ethernet (IEEE P802.3z).Ethernet MAC addressA unique, 48-bit number programmed into every LAN card, usually at the time of manufacture.Destination and source MAC addresses are contained in LAN packets and are used by bridges to filter and forward packets.GgatewayA device that connects two networks together. For example, gateways connect the network to the PSTN and the Internet.HhostA computer on which operating software resides.IIF (intermediate frequency)A radio signal that will be converted to a new frequency prior to transmission.IP (Internet Protocol)The packet-transfer protocol used on the Internet. IP speci-fies the format of the basic unit of data, the datagram, and defines the addressing scheme used for its transfer.LLAN (local area network)A network of computers, workstations, printers, file servers, and other devices that serves a particular group of users and is usually confined to a small geographical area, such as a building or campus.latencyThe amount of time it takes a packet to travel from source to destination. Network latency refers to the delay introduced when a packet is momentarily stored, analyzed, and then for-warded.LNA (low-noise amplifier)A device that increases the amplitude of an RF signal with-out introducing significant amounts of noise.MMAC (medium access control) layerThe network layer protocol that controls access to the physi-cal transmission medium. The MAC layer, defined in IEEE 802, is sometimes called a sublayer because it is equivalent to the lower half of the data link layer in the OSI reference model. It mediates between the physical layer and the logical link control sublayer.MGB (master ground bar)The MGB is a bus bar that provides an electrical interface between the building’s integrated ground plane and an iso-lated ground plane.modem (modulator-demodulator)A device that performs the conversion between digital data and analog signals.MOP (methods of procedure)A SOMA Networks document that describes the work to be done at a customer’s site.Nnetwork coreIn a SOMA Networks context, the network core is the switching fabric that interconnects all components and transfers bearer traffic, signaling information, embedded control messages, and network management traffic. The net-work core could be implemented as a single IP router con-necting all components in star topology or could be an arbitrary meshed topology with several routers and routes between systems.OOS (Operating system)The master control program that runs a computer. The OS is the first program loaded when a computer is turned on, controls software access to resources such as the central pro-cessing unit, memory, and peripherals, and runs all of the computer’s programs.
Glossary2006/8/3 Part ####### revision 001 106PPSTN (public switched telephone network)The international telephone system for analog voice traffic. The PSTN refers to the original copper wire telephone infra-structure and services.RRF (radio frequency)Any frequency in the electromagnetic spectrum that is used for radio transmission (typically 1 MHz to 300 GHz).RJ-45 (registered jack-45)An 8-wire connector used to connect computers to an Ether-net or a token-ring LAN.routerA device that forwards packets of any type from one LAN or WAN to another. Routers read the information in packet headers and use routing tables an protocols to determine the optimal route between hosts.SsectorA wedge of a radio cell used to increase the capacity of the cell. Radio sectors use directional antennas instead of omni-directional antennas.The base station supports up to six sectors, each of which is managed by a sector controller.SOMAportThe SOMA Networks CPE. The SOMAport is the terminal device that connects a subscriber’s telephones and personal computers via a wireless link to the base station.switchIn networks, a device that filters and forwards packets based on the address in the packet header. Switches operate at the data link layer of the OSI Reference Model.TTCP (Transmission Control Protocol)A protocol that enables two hosts to establish a connection and reliably exchange streams of data over IP-controlled net-works. TCP operates at the transport layer of the OSI Refer-ence Model.TCP/IP (Transmission Control Protocol/Internet Protocol)The suite of communications protocols developed by the United States Department of Defense to connect dissimilar systems. TCP/IP is supported by many operating systems and is the protocol of the Internet. It uses IP addressed to route messages over multiple networks.UUPS (uninterruptable power supply)A battery-powered device that provides power to a system in the event of an interruption to the main power.WWAN (wide area network)A physical or logical data network that spans a relatively large geographical area and that typically connects two or more LANs.
2006/8/3 Part ####### revision 001 107AWG – American wire gaugeBTU – British thermal unitCFM – cubic feet per minuteCSU – customer service unitdB – decibelDIV – diversityES – Ethernet switchHVAC – heating, ventilation, air-conditioningIP – Internet ProtocolMC – management controllermodem – modulator-demodulatorMOP – methods of procedureNC – not connectedNEBS – network equipment-building systemNOC – network operations centerOAMP – operations, administration, maintenance, and provisioningPDP – power distribution panelPIC – physical interface cardRF – radio frequencyRFSS – radio frequency subsystemRS – radio shelfRX – receiveSC – sector controllersSCP – Secure CopySSH – Secure ShellTX – transmitUTC – universal time codeVSWR – voltage standing wave ratioWCS – wireless communications servicesChapter 0ABBREVIATION
Abbreviations2006/8/3 Part ####### revision 001 108

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