SRT Acquisition RUCPI Base Station Transceiver User Manual Customer Premise Installation

SRT Acquisition Base Station Transceiver Customer Premise Installation

Installation manual

NERA Telecommunications PRELIMINARYCustomer Premise Installation Issue #0.1, September, 2000Preliminary Document – Not for DuplicationPage 1 of 91 CUSTOMER PREMISE INSTALLATION: Velocity2000™ WLLSystem1.1 GeneralThis document provides installation and reference information for the Customer Premisecomponents of the Velocity2000™ Wireless Local Loop System. Components includedare: the Radio Unit (RU), Digital Radio Link (DRL)(Cable), and the Customer PremiseInterface (CPI).1.1.1 Radio Unit (RU)The Radio Unit (RU) provides a remote wireless interface between the customerpremises and the Host Digital Terminal (HDT) that is fully synchronized to the networkinterface at the base station. The RU is mounted either directly to the customer premise,on a freestanding mast, or on a mast mounted to the customer premise.The RU is an outdoor, environmentally sealed antenna, housed in a plastic radome. Theantenna is attached to the back plate casting. An o-ring seals the entire unit to theradome. The access panel has an attached environmental/EMI gasket. The CPIinterface cable (DRL) enters through a watertight squeeze grip on the access panel. Thecable interfaces to the antenna via a seven-position connector (16 AWG max). A groundlug is attached to the external back plate casting and accepts 14-6 AWG aluminum orcopper ground wire. A “valve” on the access panel allows water vapor to escape. Thesun shield is attached to the back plate along with a variety of mounting brackets (poleand flat surface mount). The unit is 10.65 inches x 4.05 inches x 9.65 inches and weighs6 pounds. The unit dissipates approximately eight (8) watts.1.1.2 Digital Radio Link (DRL)The Digital Radio Link (DRL) is a 6-wire cable, with an embedded RS422 serial interface,that connects the RU to the CPI. This cable consists of shielded twisted pairs (signallines) along with power and ground conductors. The DRL provides both power anddigital links to the CPI in addition to lighting protect termination.Note: An additional lightning ground wire must be run from the RU to earth ground alongthe shortest possible path.1.1.3 Customer Premise Interface (CPI)The power supply is a 150W 48-volt dual input, redundant 5V/1.2V out-switching supply.The power supply connects to the backplane with a DIN standard, type F connector. Thesupply provides alarms for excess temperature, current, and voltage. A temperaturesensor on the PS controls the fan activation. The power dissipated by a single supply(not sharing) is 37W.2 RADIO UNIT (RU) INSTALLATION2.1 LocationSurvey the exterior of the Customer Premise site for a location that will provide line-of-sight (LOS) communication with the Central Office (CO) or the Radio Base StationController location, where the Radio Base Station Antenna is mounted. Figure 1 showstypical installations.
NERA Telecommunications PRELIMINARYCustomer Premise Installation Issue #0.1, September, 2000Preliminary Document – Not for DuplicationPage 2 of 9Care must be taken to determine how the DRL will be run to the CPI and how a separateground wire will be run to earth. Avoid too many cable bends. Avoid power lines. Avoidsignal lines. The separate ground wire must be run as straight as possible from the RUdirectly to earth. Listed are three mounting options to choose from in determining whichmounting configuration to use.1. Use the highest point of the Customer Premise for LOS operation and choose a flatsurface on which to mount the RU.2. Install (or have installed), a freestanding vertical pole next to the Customer Premise(if it is deemed necessary), to obtain the appropriate height for LOS operation. (Obeylocal codes for the installation of such a mount.)3. Install (or have installed), a vertical pole directly onto the Customer Premise (if it isdeemed necessary), to obtain the appropriate height for LOS operation. (Obtain theCustomer’s permission for this installation and obey local codes for such a mount.)Refer to Figure 1 to view the typical installation.Figure 1 – Typical Installation2.2 Mount2.2.1 Flat SurfaceUsing the template supplied with the RU, determine the mounting hole positions on theflat surface, which correspond to the slots on the back of the RU. Determine the type of Lightning protection Shielded Twisted-pair Wiring CPI Box Wall-mounted Radio/Antenna Unit Mast-mounted Radio/Antenna Unit Mast in ground Shielded Twisted-pair Wiring Lightning protection CPI Box DRLDRL
NERA Telecommunications PRELIMINARYCustomer Premise Installation Issue #0.1, September, 2000Preliminary Document – Not for DuplicationPage 3 of 9anchor appropriate to the surface on which the RU will be mounted (wood screws, lagscrews, expandable anchors, etc.).Note: The RU must endure potentially severe winds and weather. The mount must besecure enough to prevent any movement.Temporarily place the RU onto the screw heads and prepare to measure distance from theRU terminal connector and ground block, to their far-end terminations at the CPI and earthground rod, respectively. Figure 2 shows the flat surface-mount points.Figure 2 – Flat Surface Mount Points2.2.2 Vertical PoleAttach the supplied Pole Mount Hardware to the back of the RU with the fastenersprovided. The screw adjustable pole clamps are designed to fit poles up to three (3)inches in diameter.NOTE: The RU must endure potentially severe winds and weather. The mount must besecure enough to prevent any movement. Be certain that the RU will not rotate on thepole, or slide downward.Temporarily place the RU onto the pole and prepare to measure distance from the RUterminal connector and ground block, to the far-end terminations at the CPI and earthground rod, respectively. Figure 3 shows the mounting clamp assembly.Figure 3 – Vertical Pole Mount Assembly
NERA Telecommunications PRELIMINARYCustomer Premise Installation Issue #0.1, September, 2000Preliminary Document – Not for DuplicationPage 4 of 93 ESD PROCEDURE3.1 GeneralWhen you see this symbol be aware that you are working with ESD-sensitivecomponents. Take the prescribed precautions.3.1.1 Wear A Grounding Wrist StrapWear a grounding wrist strap when installing or removing components.NOTE: To properly use a grounding wrist strap, perform the following test using anohmmeter:• Set the ohmmeter to the maximum resistance scale• Connect one meter-lead to the contact point of the wrist strap and the other lead tothe clip or banana plug on the far end of the wrist strap. Hold one lead (not both)while performing this measurement.A resistance reading in the vicinity of 1 megohm (one million ohms) indicates that thewrist strap is acceptable. A reading of less than 900,000 ohms indicates that the wriststrap is inadequate and may not provide proper protection. An “open” reading indicatesthat the internal resistance of the wrist strap has failed and it will not protect theequipment from ESD damage.3.2 UseAttach the wrist strap securely to your wrist and clip the end to a ground post on theequipment rack or elsewhere on the metal mounting assembly. (Alternatively, insert thebanana plug into the jack provided on the equipment rack or metal mounting assembly.)Momentarily touch the grounded equipment rack to discharge any static build-up beforehandling modules or other static sensitive devices. Momentarily touch the anti-staticstorage bag to the grounded equipment rack before removing or re-inserting acomponent. Always store unused or spare ESD-sensitive devices and components intheir original anti-static storage bags.DO NOT touch any circuit traces or board components during installation. Hold theboards and assemblies by the front panel or by the board edges.3.3 Optional Lightning ProtectionAny outdoor mounted electrical device is subject to lightning strikes. The Velocity2000™WLL System, in its basic configuration, is fully lightning protected. However, for thosewho require additional protection, this Optional Lightning Protection scheme is provided.NOTE: An earth ground point is defined as one that connects directly to the earth bymeans of a highly conductive (copper, et. al.), rod or plate, buried into the earth at adepth specified by local codes.1. Choose the most direct path from the RU ground lug to an earth ground point. Avoidsharp bends and frequent turns.2. Run a 14-6 AWG copper or aluminum ground wire, from the ground lug on the RU, tothe earth ground point.3. Attach a ground clamp to the earth ground point and connect the ground wire to thisclamp.
NERA Telecommunications PRELIMINARYCustomer Premise Installation Issue #0.1, September, 2000Preliminary Document – Not for DuplicationPage 5 of 9Recommended suppliers for Optional Lightning Protection products:• Transtector Phone 208-762-6069• Zap-Tech Phone 775-588-40404 ELECTRICAL CONNECTIONThe RU/CPI interface cable (DRL) enters the RU through a watertight “squeeze grip”bushing on the access panel. The terminal block inside of the RU, is wired to the DRL byfirst removing the access panel, passing the DRL through the bushing, then reattachingthe panel. Follow the following steps and refer to Figures 4 and 5.1. Loosen the thumbscrews on either side of the access panel and remove the panel.2. Loosen and remove the squeeze grip nut.3. Slide the squeeze grip nut over the free end of the DRL.4. Pass the DRL through the squeeze grip assembly on the access panel.5. Position the squeeze grip nut back onto the assembly, but do not tighten.6. Strip the ends of the six leads in the DRL.Figure 4 – Access PanelFigure 5 – Terminal Block
NERA Telecommunications PRELIMINARYCustomer Premise Installation Issue #0.1, September, 2000Preliminary Document – Not for DuplicationPage 6 of 97. Wire the DRL leads, using the legend screened on the RU printed circuit board as aguide.8. Slide the access panel back into position, removing slack from the DRL as you go.9. Tighten the thumbscrews of the access panel.10. Tighten the squeeze grip nut.11. Attach the free end of the separate ground wire to the ground lug on the RU cabinet.(See “Optional Lightning Protection” below.)12. Reattach the RU to its mount (surface or pole).13. Dress the DRL and ground wire down and away from the RU, using cable clamps orcable ties as necessary.5 DRL INSTALLATION5.1 Cable RouteThe Digital Radio Link (DRL) cable carries critical digital information and power betweenthe CPI and the RU. The cable is shielded and internally grounded to protect signalsfrom outside interference, however it is prudent to route the DRL in such a way as toavoid proximity with sources of potential interference. The route will vary from oneinstallation to another.The ideal route for the DRL, is a simple straight line from the RU to the CPI however, thisis not always possible. In planning a specific route, try to avoid sharp, right angle bends.Do not place the DRL under or near heavy items that may shift with time. Any kink orpressure on the cable will degrade or interrupt the signal and power flow.Use cable clamps or cable ties to keep the DRL from shifting in the wind or rubbingagainst hard or rough surfaces.Do not allow the cable’s own weight to apply stress to any one point. Support the DRLwith cable ties wherever it’s own weight will pull with any meaningful force.Use a “feed through” where the DRL enters the Customer Premise. Apply therecommended weather stripping for the chosen feed through.Check the entire length of the DRL for breaks or damage to the outside covering.Replace the cable if damage is found. Do not attempt to “tape” damaged areas.The separate ground wire may parallel the DRL, but should not be attached to it via cableclamps or cable ties. DO NOT twist the DRL cable and ground wire together at any pointalong the route.6 CPI INSTALLATION6.1 LocationSurvey the interior of the Customer Premise site for a location that will provide easyaccess to the entry port of the DRL. This location should also facilitate easy access tothe Customer Premise Equipment (CPE), which will be connected to the CPI. Figure 6shows typical installations.Select a mounting location away from heat sources, electrical interference, and RFinterference.
NERA Telecommunications PRELIMINARYCustomer Premise Installation Issue #0.1, September, 2000Preliminary Document – Not for DuplicationPage 7 of 9Figure 6 – CPI Installation6.2 MountWARNING: To comply with the FCC RF exposure operating configurations, the antennashall be mounted to ensure the antenna/person separation distance of at least 2 meters.The CPI can be mounted to a flat vertical surface (wall, cabinet, etc.) or simply placedupon a table or on the floor. For wall mounting, follow these steps while referring toFigures 7 and 8:Using the template supplied with the CPI, locate the mounting hole positions on the wall,which correspond to the slots on the back of the CPI. Determine the type of anchorappropriate to the surface on which the CPI will be mounted (wood screws, lag screws,expandable anchors, etc.).NOTE: The CPI will be connected to both the DRL and CPE cables and must thereforebe able to withstand some “tugging” stresses. The mount must be secure enough toprevent any movement.Install the top two anchors, making sure they are level horizontally. Hang the CPI fromthese anchors to confirm both that the unit is level and that its proximity to all connectingcables. Adjust the mounting location as necessary. Lightning protection Shielded Twisted-pair Wiring CPI Box Wall-mounted Radio/Antenna Unit Mast-mounted Radio/Antenna Unit Mast in ground Shielded Twisted-pair Wiring Lightning protection CPI Box
NERA Telecommunications PRELIMINARYCustomer Premise Installation Issue #0.1, September, 2000Preliminary Document – Not for DuplicationPage 8 of 9Figure 7 – CPI Mounting PointsDismount the unit, install the remaining anchors, and open the front access panel(Figure 8).Figure 8 – Front Access Panel6.3 Electrical ConnectionThe RU/CPI interface cable (DRL) enters the CPI through the bottom/left corner of the cabinet.A standard bushing holds the cable in place once the cover is replaced. The terminal blockinside of the CPI, is wired to the DRL by first removing the access panel, passing the DRLthrough the bushing, then reattaching the panel. Follow the steps below and refer to Figure 9:1. Place hands on either side of the access panel and pull down on the panel.2. Strip the ends of the six leads in the DRL.3. Wire the DRL leads, using the legend screened on the CPI printed circuit board as aguide.4. Dress the DRL down and away from the RU, using cable clamps or cable ties asnecessary.Slide down on both sides
NERA Telecommunications PRELIMINARYCustomer Premise Installation Issue #0.1, September, 2000Preliminary Document – Not for DuplicationPage 9 of 9Figure 9 – Terminal Block5. Replace the access cover and reattach the CPI to its mount.6. Attach the power supply connector plug to the jack at the bottom of the cabinet.7. Attach the Customer Premise Equipment (CPE) to the RS232 connector at thebottom of the cabinet.8. Refer to the Turn-Up and Operation documents.

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