Ensemble Communications ODU-2800-002 LMDS Base Station Transceiver User Manual Preinstallation

Ensemble Communications Inc. LMDS Base Station Transceiver Preinstallation

Preinstallation

3Ensemble Communications Inc.Preinstallation 3This chapter gives checklists and guidelines for preinstallation of Fiberless System hardware.Note When updating or building facilities to accommodate Ensemble equipment, observe all building codes and regulations.Chapter Topics Ancillary Equipment 3-10Antenna Screening 3-5Antenna Separation for Asynchronous Transmission 3-6Antenna Separation for Synchronous Transmission 3-6Installation Requirements 3-3Installation Tips 3-4Licenses and Permits 3-2Location Guidelines 3-2Multiple Antenna Configuration 3-6ODU Guidelines 3-4Power Requirements 3-3Roof Penetration 3-5Site Preparation 3-2
Ensemble Communications Inc.3-2Operator’s Guide to the Fiberless SystemSite PreparationSite preparation time varies, depending on the particular site. For example, installation in a new location may require building modifications, while an existing building would not.Licenses and Permits Verify all licensing and permit issues. Such issues may include:• Import/export licenses for the site country• Radio licenses, both station license and frequency licenseOther permits may also be required, depending on location. Some typical examples include:• Landlord approval of plans for the pending construction• Construction permits• Electrical permits• Zoning or use permits for the proposed facility and examina-tion of possible impact on neighboring areasNote When placing antennas near airports, it may be necessary to obtain authorization from the appropriate aviation authorities.Location Guidelines • Verify that the selected locations are accessible to installers and equipment.• Verify that all utilities and services, including AC power, are available.• Verify that lightning protection and grounding systems are available and comply with local building codes.• If prime AC power needs to be installed, use a licensed electri-cal contractor. Verify all components are installed in accordance with local electrical codes.
Ensemble Communications Inc.Preinstallation3-3InstallationRequirements Size and accessThe base station chassis mounts in a standard 19-inch (48-cm) rack or cabinet and requires 10 rack units (RUs) of space (17.5 inches (44 cm)), 24 inches (60 cm) deep. Allow adequate clearance around the base station to permit access for installation of cards, assemblies, and modules. Verify there is sufficient room to route and attach cables to the rear of the unit. The unit requires clearance of at least 30 inches (76 cm) in the front and 24 inches (60 cm) in the rear.Floor loadingA fully equipped base station cabinet with a -48 VDC power system and batteries can weigh up to 800 pounds (360 kg). Verify the cabinet and power plant do not exceed the floor loading limits.Temperature allowancesVerify the indoor location meets the following temperature allowances, including ventilation enough to dissipate heat loads of up to 1750 watts per fully equipped base station chassis:Storage -40° to 60° C (-40° to 140° F)Operation 0° to 50° C (32° to 122° F)Recommended 10° to 30° C (50° to 86° F)Power Requirements The base station requires a -48 VDC power source, which can be supplied by either a -48 VDC power distribution system or a local -48 VDC power supply. The local power source should be capable of supplying a minimum of 50 amps.For redundancy, each base station chassis requires two power bus connections (A and B). These connections are on the backside of the chassis in the Power Distribution Frame (PDF). Note The 50 amp power supply requirement is based on the power required for a single chassis, fully populated, in an ATM configuration.
Ensemble Communications Inc.3-4Operator’s Guide to the Fiberless SystemInstallation Tips Installers are responsible for determining the proper attachment method. The following are suggestions regarding cabinet and rack installations. WARNINGDo not place any equipment in the cabinet or rack without first securing it to the floor.•For concrete floors, use threaded rods with washers and nuts or the proper length and diameter machine bolts with concrete insert anchors.•Move the cabinet or rack into position and mark the attach-ment location in each corner on the floor. Move the cabinet or rack out of the way, then drill the appropriate size hole in the floor for the anchor being used. •Install four anchors into the floor following manufacturer instructions.•Vacuum the floor to remove all dust and debris.•Move the cabinet or rack back into place and secure the four corners.ODU Guidelines •Verify that the mounting mast was installed according to con-struction drawings and local construction codes and practices. Mounting masts are typically a section of 2-inch (5 cm) to 4-inch (10 cm) pipe.•Verify cable route from the base station or CPE to the ODU. It can be no longer than 1,000 feet (300 meters). This may be a duct or conduit. If required, install a dedicated conduit between the ODU and base station location. A 1-inch (2.5 cm) to 2-inch (5 cm) conduit is recommended, depending on the number of ODU cables being installed.•Install a ground plate and lightning suppressor at the building entry point and at the ODU.•Prepare all mounting hardware for the base station. •Verify the power system and wiring for the base station, including the cabling, grounds, circuit breakers, and fuses.
Ensemble Communications Inc.Preinstallation3-5•For safety and performance, mount ODUs at least seven feet (2.1 meters) above the roof so people are able to walk on the roof without interfering with the antenna’s beam. Clearance should also be adequate enough to permit the following activi-ties:•Antenna unit installation and maintenance•Antenna alignment•Window washing•HVAC maintenance•Maintenance of other antennasAntenna Screening Some building owners or local regulations require that antennas be hidden from view. In such cases, consider the attenuation characteristics of the material being used to hide the antennas when calculating paths. Consider factors such as the angle of incidence between the antenna and the screening material as well as the antenna’s polarization.Roof Penetration If installation of antenna unit cables or antenna unit mountings requires penetrating a roof, engage only contractors familiar with accepted practices for ensuring weather-tight seals to make the penetrations. This issue is of particular concern when installing on buildings with a continuous roofing membrane.
Ensemble Communications Inc.3-6Operator’s Guide to the Fiberless SystemMultiple Antenna ConfigurationIn multiple antenna configurations, each sector must be separated by a prescribed space to prevent interference from adjacent sectors. The size of this space depends primarily on the amount of interference a sector’s receiver can tolerate and whether the sectors are operating synchronously or nonsynchronously.Antenna Separationfor SynchronousTransmissionFor configurations using synchronous transmission (that is, each sector associated with a base station transmits at the same time and receives at the same time), multiple sectors must be separated by at least 0.5 meters (1.65 feet) vertically and horizontally (see Figure 3-1 and Figure 3-2).Antenna Separationfor AsynchronousTransmissionFor configurations using asynchronous transmission (that is, some sectors may be transmitting simultaneously while others are receiving), multiple sectors must be attenuated so the receiver’s SNR does not fall below the minimum level required to demodulate the signal. Based on the horizontal antenna patterns for the Andrew BCA Mark II antenna, Table 3-1 provides minimal horizontal spacing to isolate sectors that are separated by one, two, three, and four channels from each other. For distances within the near field range, the antennas act as radiating point sourcesTable 3-1: Minimum Horizontal Spacing for Nonsynchonous Sectors Antenna Beam Width in DegreesAngular Separation in DegreesN+1 Spacing (Meters/Feet)N+2 Spacing (Meters/Feet)N+3 Spacing (Meters/Feet)N+4 Spacing (Meters/Feet)45 0 20.33 3.57 0.36 0.3645 45 20.33 3.57 0.36 0.3645 90 20.33 3.57 0.36 0.3645 180 20.33 3.57 0.36 0.3660 0 20.33 3.57 0.36 0.3660 60 20.33 3.57 0.36 0.3660 90 20.33 3.57 0.36 0.3660 120 20.33 3.57 0.36 0.3660 180 20.33 3.57 0.36 0.3690 0 79.80 3.57 0.36 0.3690 45 20.33 3.57 0.36 0.3690 60 20.33 3.57 0.36 0.3690 90 20.33 3.57 0.36 0.36
Ensemble Communications Inc.Preinstallation3-7Figure 3-1, Figure 3-2, and Figure 3-3 show recommended spatial separation for various multiple-antenna mounting scenarios.Figure 3-1. Two Antennas with a Single Mounting Pole90 180 20.33 3.57 0.36 0.36Table 3-1: Minimum Horizontal Spacing for Nonsynchonous Sectors Antenna Beam Width in DegreesAngular Separation in DegreesN+1 Spacing (Meters/Feet)N+2 Spacing (Meters/Feet)N+3 Spacing (Meters/Feet)N+4 Spacing (Meters/Feet)Min. 0.5 MetersAssumptions:Gain at +/-90° vertical is –10 dBiPerfect vertical alignmentSkirt from Interferer limited to –94 dBm beneath threshold of –93 dBm for QAM64. For synchronous transmission, D=0.5 m (1.65 ft)D
Ensemble Communications Inc.3-8Operator’s Guide to the Fiberless SystemFigure 3-2. Proper Mounting of Two Antennas on Separate PolesFigure 3-3. Minimum Angle SeparationUse Table 3-2 and the following figures to calculate roof-mount requirements to clear the first Fresnel zone for nearby obstructions.DChannelNChannelN+2Assumptions:Antennas pointed in parallelMinimum of two channels separationSpacing dependent on modulation rate and antenna beam width ·See Table 3-1 for horizontal separations for nonsynchronous transmission. Separation for synchronous transmission is 0.5 m (1.65 ft).DChannelNChannelN+2AssumptionsAntennas separated by angle DSpatial separation DMinimal angle and separation dependent on modulation rate and antenna beamwidthSee Table 3-1 for horizontal separations for nonsynchronous transmissions.Table 3-2: Minimum Roof ClearanceFrequency D1 (meters) Minimum R (cm)24 1 ~024 10 1.1224 100 3.5341 1 ~0
Ensemble Communications Inc.Preinstallation3-9Figure 3-4. Roof-mount Clearance Requirements41 10 0.8541 100 2.70Table 3-2: Minimum Roof ClearanceFrequency D1 (meters) Minimum R (cm)RD1Building Roof or Support SurfaceParapetODU
Ensemble Communications Inc.3-10Operator’s Guide to the Fiberless SystemAncillary EquipmentNote Although Ensemble recommends manufacturers, the Fiberless System supports most standard-manufactured ancillary equipment.Table 3-3: Ancillary Equipment RequirementsEquipment Recommendation or Requirement Manufacturer and Part NumberRequired ODU cables Standard cable – RG-6 Part No. Belden 9248Plenum Cable – RG-6Not suitable for outside usePart No. Belden 82248Required ODU connectors TNC crimp connector for Belden 9248 cableTrompeter Electronics Part No. UPL 240-020TNC crimp connector for Belden 82248 cableTrompeter Electronics Part No. 105-1457-10Connector crimp tools TNC crimp tool Trompeter Electronics Part No. CT4LTNC crimp tool die Trompeter Electronics Part No. CD3-38 point center pin tool Trompeter Electronics Part No. 010-0055Lightning suppressors Suppressor Kit – Outdoor Unit PolyPhaser Part No. 097-0619T-B.3Suppressor – Indoor Unit PolyPhaser Part No. 097-0619T-B.4Mounting Plate (12 indoor units)PolyPhaser Part No. 100-0501S-ABase station power supply– 48 VDC 50 Amps (depending on configuration)Telephony-type modular power systemsPower Conversion Products Twin-pack Plus seriesCPE power – 120 VAC Protection: small UPS (Uninterruptible Power System)APCRacks 19-inch or 23-inch. Any manufacturerBase station routers DS-3 ATM interface and fast Ethernet cardCisco 7200 seriesCPE routers v.35 interface Cisco 1601RDual 10BaseT ports Cisco 1605R Tower mounts 2-4-inch pipeWall mount available Microflect; Andrews, Tower Structures

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