NERA Telecommunications Customer Premise Installation PRELIMINARY Issue #0.1, September, 2000 1 CUSTOMER PREMISE INSTALLATION: Velocity2000 WLL System 1.1 General This document provides installation and reference information for the Customer Premise components of the Velocity2000 Wireless Local Loop System. Components included are: the Radio Unit (RU), Digital Radio Link (DRL)(Cable), and the Customer Premise Interface (CPI). 1.1.1 Radio Unit (RU) The Radio Unit (RU) provides a remote wireless interface between the customer premises and the Host Digital Terminal (HDT) that is fully synchronized to the network interface 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. The antenna is attached to the back plate casting. An o-ring seals the entire unit to the radome. The access panel has an attached environmental/EMI gasket. The CPI interface cable (DRL) enters through a watertight squeeze grip on the access panel. The cable interfaces to the antenna via a seven-position connector (16 AWG max). A ground lug is attached to the external back plate casting and accepts 14-6 AWG aluminum or copper ground wire. A valve on the access panel allows water vapor to escape. The sun shield is attached to the back plate along with a variety of mounting brackets (pole and flat surface mount). The unit is 10.65 inches x 4.05 inches x 9.65 inches and weighs 6 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 (signal lines) along with power and ground conductors. The DRL provides both power and digital 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 along the 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. The supply provides alarms for excess temperature, current, and voltage. A temperature sensor on the PS controls the fan activation. The power dissipated by a single supply
(not sharing) is 37W. 2 RADIO UNIT (RU) INSTALLATION 2.1 Location Survey 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 Station Controller location, where the Radio Base Station Antenna is mounted. Figure 1 shows typical installations. Preliminary Document Not for Duplication Page 1 of 9 NERA Telecommunications Customer Premise Installation PRELIMINARY Issue #0.1, September, 2000 Care must be taken to determine how the DRL will be run to the CPI and how a separate ground wire will be run to earth. Avoid too many cable bends. Avoid power lines. Avoid signal lines. The separate ground wire must be run as straight as possible from the RU directly to earth. Listed are three mounting options to choose from in determining which mounting configuration to use. 1. Use the highest point of the Customer Premise for LOS operation and choose a flat 2. 3. surface on which to mount the RU. 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. (Obey local codes for the installation of such a mount.) Install (or have installed), a vertical pole directly onto the Customer Premise (if it is deemed necessary), to obtain the appropriate height for LOS operation. (Obtain the Customers permission for this installation and obey local codes for such a mount.) Refer to Figure 1 to view the typical installation. Wall-mounted Radio/Antenna Unit DRL Shielded Twisted-pair Wiring CPI Box Mast-mounted Radio/Antenna Unit DRL Shielded Twisted-pair Wiring Lightning protection CPI Box Lightning protection Mast in ground Figure 1 Typical Installation 2.2 Mount 2.2.1 Flat Surface Using the template supplied with the RU, determine the mounting hole positions on the flat surface, which correspond to the slots on the back of the RU. Determine the type of Preliminary Document Not for Duplication Page 2 of 9 NERA Telecommunications Customer Premise Installation PRELIMINARY Issue #0.1, September, 2000 anchor appropriate to the surface on which the RU will be mounted (wood screws, lag screws, expandable anchors, etc.). Note: The RU must endure potentially severe winds and weather. The mount must be secure enough to prevent any movement. Temporarily place the RU onto the screw heads and prepare to measure distance from the RU terminal connector and ground block, to their far-end terminations at the CPI and earth ground rod, respectively. Figure 2 shows the flat surface-mount points. Figure 2 Flat Surface Mount Points 2.2.2 Vertical Pole Attach the supplied Pole Mount Hardware to the back of the RU with the fasteners provided. 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 be secure enough to prevent any movement. Be certain that the RU will not rotate on the pole, or slide downward. Temporarily place the RU onto the pole and prepare to measure distance from the RU terminal connector and ground block, to the far-end terminations at the CPI and earth ground rod, respectively. Figure 3 shows the mounting clamp assembly. Figure 3 Vertical Pole Mount Assembly Preliminary Document Not for Duplication Page 3 of 9 NERA Telecommunications Customer Premise Installation 3 ESD PROCEDURE 3.1 General PRELIMINARY Issue #0.1, September, 2000 When you see this symbol be aware that you are working with ESD-sensitive components. Take the prescribed precautions. 3.1.1 Wear A Grounding Wrist Strap Wear a grounding wrist strap when installing or removing components. NOTE: To properly use a grounding wrist strap, perform the following test using an ohmmeter:
Set the ohmmeter to the maximum resistance scale Connect one meter-lead to the contact point of the wrist strap and the other lead to the 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 the wrist strap is acceptable. A reading of less than 900,000 ohms indicates that the wrist strap is inadequate and may not provide proper protection. An open reading indicates that the internal resistance of the wrist strap has failed and it will not protect the equipment from ESD damage. 3.2 Use Attach the wrist strap securely to your wrist and clip the end to a ground post on the equipment rack or elsewhere on the metal mounting assembly. (Alternatively, insert the banana 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 before handling modules or other static sensitive devices. Momentarily touch the anti-static storage bag to the grounded equipment rack before removing or re-inserting a component. Always store unused or spare ESD-sensitive devices and components in their original anti-static storage bags. DO NOT touch any circuit traces or board components during installation. Hold the boards and assemblies by the front panel or by the board edges. 3.3 Optional Lightning Protection Any outdoor mounted electrical device is subject to lightning strikes. The Velocity2000 WLL System, in its basic configuration, is fully lightning protected. However, for those who 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 by means of a highly conductive (copper, et. al.), rod or plate, buried into the earth at a depth specified by local codes. 1. Choose the most direct path from the RU ground lug to an earth ground point. Avoid sharp bends and frequent turns. 2. Run a 14-6 AWG copper or aluminum ground wire, from the ground lug on the RU, to the earth ground point. 3. Attach a ground clamp to the earth ground point and connect the ground wire to this clamp. Preliminary Document Not for Duplication Page 4 of 9 NERA Telecommunications Customer Premise Installation PRELIMINARY Issue #0.1, September, 2000 Recommended suppliers for Optional Lightning Protection products:
Transtector Phone 208-762-6069 Zap-Tech Phone 775-588-4040 4 ELECTRICAL CONNECTION The 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 by first removing the access panel, passing the DRL through the bushing, then reattaching the 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 Panel Figure 5 Terminal Block Preliminary Document Not for Duplication Page 5 of 9 NERA Telecommunications Customer Premise Installation PRELIMINARY Issue #0.1, September, 2000 7. Wire the DRL leads, using the legend screened on the RU printed circuit board as a guide. 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 or cable ties as necessary. 5 DRL INSTALLATION 5.1 Cable Route The Digital Radio Link (DRL) cable carries critical digital information and power between the CPI and the RU. The cable is shielded and internally grounded to protect signals from outside interference, however it is prudent to route the DRL in such a way as to avoid proximity with sources of potential interference. The route will vary from one installation to another. The ideal route for the DRL, is a simple straight line from the RU to the CPI however, this is 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 or pressure 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 rubbing against hard or rough surfaces. Do not allow the cables own weight to apply stress to any one point. Support the DRL with cable ties wherever its own weight will pull with any meaningful force. Use a feed through where the DRL enters the Customer Premise. Apply the recommended 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 cable clamps or cable ties. DO NOT twist the DRL cable and ground wire together at any point along the route. 6 CPI INSTALLATION 6.1 Location Survey the interior of the Customer Premise site for a location that will provide easy access to the entry port of the DRL. This location should also facilitate easy access to the Customer Premise Equipment (CPE), which will be connected to the CPI. Figure 6 shows typical installations. Select a mounting location away from heat sources, electrical interference, and RF interference. Preliminary Document Not for Duplication Page 6 of 9 NERA Telecommunications Customer Premise Installation Wall-mounted Radio/Antenna Unit PRELIMINARY Issue #0.1, September, 2000 Mast-mounted Radio/Antenna Unit Shielded Twisted-pair Wiring CPI Box Lightning protection Mast in ground Shielded Twisted-pair Wiring Lightning protection CPI Box Figure 6 CPI Installation 6.2 Mount WARNING: To comply with the FCC RF exposure operating configurations, the antenna shall 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 placed upon a table or on the floor. For wall mounting, follow these steps while referring to Figures 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 anchor appropriate 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 therefore be able to withstand some tugging stresses. The mount must be secure enough to prevent any movement. Install the top two anchors, making sure they are level horizontally. Hang the CPI from these anchors to confirm both that the unit is level and that its proximity to all connecting cables. Adjust the mounting location as necessary. Preliminary Document Not for Duplication Page 7 of 9 NERA Telecommunications Customer Premise Installation PRELIMINARY Issue #0.1, September, 2000 Figure 7 CPI Mounting Points Dismount the unit, install the remaining anchors, and open the front access panel
(Figure 8). Slide down on both sides Figure 8 Front Access Panel 6.3 Electrical Connection The 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 block inside of the CPI, is wired to the DRL by first removing the access panel, passing the DRL through 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 a guide. 4. Dress the DRL down and away from the RU, using cable clamps or cable ties as necessary. Preliminary Document Not for Duplication Page 8 of 9 NERA Telecommunications Customer Premise Installation PRELIMINARY Issue #0.1, September, 2000 Figure 9 Terminal Block 5. 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 the bottom of the cabinet. 8. Refer to the Turn-Up and Operation documents. Preliminary Document Not for Duplication Page 9 of 9