Huawei Technologies RRU3702-2500 Remote Radio Unit User Manual Installation Guide
Huawei Technologies Co.,Ltd Remote Radio Unit Installation Guide
Contents
- 1. Installation Manual
- 2. Installation Guide
Installation Guide
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| Document ID | 1589721 |
| Application ID | nbZQPRlb+xK0fuwaalXt5w== |
| Document Description | Installation Guide |
| Short Term Confidential | No |
| Permanent Confidential | No |
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| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 410.94kB (5136698 bits) |
| Date Submitted | 2011-11-29 00:00:00 |
| Date Available | 2012-01-13 00:00:00 |
| Creation Date | 2011-09-13 15:20:42 |
| Producing Software | Acrobat Distiller 7.0 (Windows) |
| Document Lastmod | 2011-09-13 15:21:36 |
| Document Title | Installation Guide |
| Document Creator | PScript5.dll Version 5.2 |
SingleRAN WiMAX-LTE V100R001C00 Quick Installation Guide (Co-RRU3702) Issue: XX Date: 2011-XX-XX HUAWEI TECHNOLOGIES CO., LTD. Contents Installation Tools Installation Scenarios Requirements for Dimensions and Installation Space Installation Procedure Installing the BBU3900 Installing the RRU Connecting Cables Installing BBU3900 Cables Installing RRU3702 Cables Installing the Outdoor Cable Transfer Box Measuring the VSWR of the Antenna System Installation Checklist for the BBU Installation Checklist for the RRU Checklist for the Project Implementation Appendix 15 19 26 29 29 30 31 31 32 Copyright © Huawei Technologies Co., Ltd. 2011. All rights reserved. Installation Tools Hammer drill (with bit 14) Heat gun Rubber mallet Utility knife ESD gloves Vacuum cleaner Phillips screwdriver Flat-head screwdriver (M3 to M6) (M3 to M6) Crimping pliers Wire cutter Wire stripper Adjustable wrench [with a diameter of at least 32 mm (1 1/4")] Torque wrench Combination wrench [21 mm (0 13/16") to 21 mm (0 13/16")] for pole installation Level Torque screwdriver [17 mm (0 11/16") to 17 (0 11/16")] for wall installation Marking pen Multimeter [with a diameter of no more than 10 mm (0 3/8")] Measuring tape Installation Scenarios a BBU3900 Installation Scenarios BBU BBU BBU In a 19-inch indoor rack In an APM30H In a TMC11H BBU In an OMB For details about the installation of the APM30 and the TMC11H, see the APM30H Installation Guide. b RRU3702 Installation Scenarios On a pole On a wire pole On angle steel On U-steel On a wall z A cabinet must be powered on within seven days after being unpacked, and cannot be kept in the power-off status over 48 hours during maintenance. z A module must be powered on within 24 hours after being unpacked or after being powered off for maintenance. Requirements for Dimensions and Installation Space a Dimensions 31 mm (1 2 3 /1 6'') 86 mm (3 3/8'') 442 1' m( 53 /8'') Dimensions of the BBU: 442 mm (1'-5 3/8'') x 310 mm (1'-0 3/16'') x 86 mm (3 3/8'') 374 mm (1'-2 3/4'') 120 mm (4 3/4'') 356 mm (1'-2'') 158 mm (6 1/4'') 480 mm (1'-6 7/8'') Dimensions of the RRU3702: 480 mm (1'-6 7/8'') x 356 mm (1'-2'') x 120 mm (4 3/4'') 484 mm (1'-7 1/16'') Dimensions of the RRU3702 with a shell: 484 mm (1'-7 1/16'') x 374 mm (1'-2 3/4'') x 158 mm (6 1/4'') b Space Requirements for the BBU3900 Installation In a 19-inch rack 25 m( 25 1'') 70 mm m( (2 1'') 3 /4 '') c Installation Space Recommended space for RRU3702 installation Minimum space for RRU3702 installation ≥ 300 mm (11 13/16'') 200 mm (7 7/8'') ≥ (11 300 1 3 mm /16 '') mm 800 ') ≥ 7 1/2' (2'- 10 (3 0 mm 15 /16 '') ≥ (1' 600 - 1 1 mm 5/8 '') mm '') 600 11 5/ 8 (1'- ≥ 500 mm (1'-7 11/16'') 300 mm (11 13/16'') The recommended installation space meets the requirements of the equipment for normal running and OM. When the installation space is sufficient, the recommended installation space can be adopted. The minimum installation space meets the requirements of the equipment for normal running and heat dissipation, but does not meet the requirements for OM such as checking the status of the indicators and opening the maintenance cavity. When the installation space is restricted, the minimum installation space can be adopted. Recommended horizontal space for RRU3702 installation ≥ 300 mm (11 13/16'') ≥ 600 mm (1'-11 5/8'') 40 (1' 0 mm -3 3/4 '') Minimum horizontal space for RRU3702 installation ≥ 600 mm 100 mm (1'-11 5/8'') (3 15/16'') Recommended vertical space for RRU3702 installation 400 mm (1'-3 3/4'') Recommended vertical space for RRU3702 installation ≥ 300 mm (11 13/16'') 200 mm (7 7/8'') ≥ 500 mm (1'-7 11/16'') 300 mm (11 13/16'') ≥ 500 mm (1'-7 11/16'') 300 mm (11 13/16'') 400 mm (1'-3 3/4'') Installation Procedure Installing the BBU3900 a. Verify that the BBU3900 mounting ears are regularly installed in a 19-inch rack, and are reversely installed in an APM. Regularly installed mounting ears b. Install the BBU3900 in an APM30H using a binding bracket. Reversely Bounding installed bracket mounting ears Reversely installed mounting ears a Installing the BBU3900 in a 19-Inch Rack For easy installation, remove the two ground screws on the right side of the BBU panel before installing the BBU. M6X16 Regularly installed mounting ears 2 N.m (17.70 lbf.in.) b Installing the BBU3900 in an APM30H M6X16 2 N.m (17.70 lbf.in.) BBU Reversely installed mounting ears c Installing the BBU3900 in a TMC11H M6X16 2 N.m (17.70 lbf.in.) BBU3900 Reversely installed mounting ears e Installing the BBU3900 in an OMB M6X16 2 N.m (17.70 lbf.in.) FAN Remove the two ground screws on the right side of the BBU panel before installing the BBU. Reversely installed mounting ears Installing the RRU Mounting brackets for RRU Auxiliary bracket Tighten the screws when installing the RRU. Loosen these screws when removing the RRU. Fixing hoop Dual-nut bolt Main bracket Logo on the cover plate Transfer pieces Tighten the screws when removing the RRU. RRU Angle steel or U-steel The angle between the vertical and the angle steel or Usteel or angle steel where the RRU is ≤10° installed must be less than or equal to 10 degree. z The RRU must be supported by foam or cardboard for protection. z The RF ports at the bottom of the RRU cannot bear the weight of the RRU. Do not place the RRU on the ground in the upright position. Installing the RRU on a Pole [Diameter: 60 mm (2 3/8'') to 114 mm (4 1/2'')] 1. Install the main bracket. When installing the main bracket, ensure that the contact piece on the bracket is fixed. Main bracket 1200 mm (3'-11 1/4'') to 1600 mm (5'-3'') Spring plate 60 mm (2 3/8'') to 114 mm (4 1/2'') The recommended diameter of the pole is 80 mm (3 1/8"). You may fit one end of the auxiliary bracket on one dual-nut bolt assembly and then the other end on the other dual-nut bolt assembly during the installation. 2. Use an adjustable wrench to tighten the nut until the fastening torque is 40 N.m (354.03 lbf.in.). This secures the main and auxiliary brackets to the pole. 40 N.m (354.03 lbf.in.) Tighten the two dual-nut bolt assemblies alternatively. After the brackets are secured, use a measuring tape to measure the spacing between the main bracket and the auxiliary bracket on two sides and confirm that the spacing is the same. 3. Install the RRU on the main bracket. When you hear click sound, the RRU is securely installed. Installing Two RRUs on a Pole [Diameter: 60 mm (2 3/8'') to 114 mm (4 1/2'')] 1. Install the first RRU. 2. Install the second main bracket. The arrows on the main bracket point upwards. 10 3. Swap the front cover and the transitional piece at the rear of the second RRU. M6X16 5 N.m (44.25 lbf.in.) 4. Install the second RRU on the main bracket. In reverse mode In standard mode Ensure that the cabling cavities of the two RRUs face the same direction when installing the RRUs. Cabling cavity c Installing the RRU on a U-Steel Top views of four installation modes U-steel 30 mm (1 3/16'') to 50 mm (1 15/16'') 50 mm (1 15/16'') to 100 mm (3 15/16'') z The process for installing the RRU on U-steel is the same as the procedure for installing the RRU on a pole. z You are advised to install only one RRU on U-steel. 11 d Installing the RRU on Angle Steel Top views of the installation modes to ') 2' 1/ 8'') (2 1/ m (3 m m 63 0 m 80 3 m m m m (2 (3 1/ 1/ 2'') 8' to ') Angle steel z The process for installing the RRU on angle steel is the same as the procedure for installing the RRU on a pole. z You are advised to install only one RRU on angle steel. the RRU on a Wire Pole e Installing [Diameter: 300 mm (11 4/5'') to 390 mm (1' 3 3/8'')] You are advised to install only one RRU on a wire pole. 35N•m (309.78 lbf.in.) Main bracket 12 f Installing the RRU on a Wall 1. Place the auxiliary bracket in the installation position against the wall. Then, level the auxiliary bracket with a level and mark the anchor points with a marker. 128 mm(5 1/16'') Auxiliary bracket 123 mm (4 13/16'') 123 mm (4 13/16'') RRU 1200 mm (3'-11 1/4") to 1600 mm (5'-3") It is recommended that the auxiliary bracket be 1200 mm (3'-11 1/4") to 1600 mm (5'-3") above the ground. 2. Drill holes at the anchor points and then install the expansion bolt assemblies. M10x65 bolt Spring washer 10 Plastic tube Ø14 Flat washer 10 Expansion tube 90° Do not hammer the bolt entirely into the wall. Leave 20 mm (13/16") to 30 mm (1 3/16") of the bolt outside the wall. 55 mm to 60 mm 20 mm (13/16") to 30 mm (1 3/16") After the expansion bolt is removed, dispose of the plastic tube. When the RRU is installed on a wall, the requirements are as follows: z For one RRU, the wall has a weight-bearing capacity of 68 kg (149.94 lb). z The torque for tightening the expansion bolt is 30 N.m (265.52 lbf.in.). This ensures that the expansion bolts are secured to the wall without causing damage to it. 13 3. Fit the auxiliary bracket on the expansion bolts downward, and then tighten the bolts by using a combination wrench with a diameter of 17 mm (11/16"). M10 30 N.m (265.52 lbf.in.) Arrows point upwards 5. Install the RRU. 14 4. Install the main bracket. Connecting Cables a Cable Connections in General (RRU3702) The LMPTb, LMPTw, LBBPc, UPEUc, and FANc are used as examples. RRU3702s of a WiMAX-LTE BS in co-RRU mode supports only the chain topology. z An LBBPc provides six CPRI ports. However, only the CPRI0, CPRI1, and CPRI2 ports are used in the typical configurations of a WiMAX-LTE BS in co-RRU mode. z Configure the DCDU based on onsite situations. Configuration Type：WiMAX: S(2/2/2), 2T2R, 10M Hz LTE:S(1/1/1), 2T2R, 20M Hz WiMAX LTE C=carrier,1C=1carrier,2C=2 carrier A A N N T T A A N N T T A A N N T T CPRI optical fiber RRU power cable Colorcoding External power supply DCDU system 2C BBU power cable 1C To a Boolean sensor Optical fiber ASN-GW Ethernet cable Connected through the optical fiber or Ethernet cable 15 RS485 port Configuration Type：WiMAX: S(2/2/2), 4T4R, 10M Hz LTE:S(1/1/1), 4T4R, 10M Hz WiMAX LTE C=carrier,1C=1carrier,2C=2 carrier ANT ANT ANT CPRI optical fiber RRU power cable Colorcoding External power supply DCDU system 2C BBU power cable 1C To a Boolean sensor Optical fiber ASN-GW Ethernet cable Connected through the optical fiber or Ethernet cable 16 RS485 port Configuration Type：WiMAX: S(1/1/1), 4T4R, 10M Hz LTE:S(1/1/1), 4T4R, 20M Hz WiMAX C=carrier,1C=1carrier ANT ANT ANT CPRI optical fiber RRU power cable Colorcoding External power supply DCDU system 1C BBU power cable 1C To a Boolean sensor Optical fiber ASN-GW Ethernet cable Connected through the optical fiber or Ethernet cable 17 RS485 port LTE b Cable Connections of the OMB OMB PGND cable FE cable AC input power cable CPRI optical fiber Monitoring cable between the monitor board and the UPEU Input power cable of the BBU Monitoring cable between the EPS30-4815 and the monitor board Before installing cables, you need to remove the waterproof module. Then, install the cables according to the cable layout principle of installation holes at the bottom of the cabinet—clipping the cables. After installing all the cables, place the waterproof module in the original position. 18 Installing BBU3900 Cables DCDU BBU BBU APM30H TMC11H a Installing the BBU3900 PGND Cable BBU •The BBU PGND cable is yellow and green or green. The cross-sectional area of the PGND cable is 6 mm2 (0.009 in.²). •Connect one end terminated with an OT terminal or a two-hole OT terminal (M4) to the BBU. Connect the other end terminated with an OT terminal to the ground bar. •Prepare the PGND cable at the site. •The BBU in the APM30H, TMC, or OMB is grounded using mounting ears. BBU PGND cable OT terminal Two-hole OT terminal b Installing the -48 V DC Power Cable of the BBU3900 BBU BBU power cable DCDU-03B Connect the DCDU-03B and the BBU using the LOAD6 or LOAD7 port, with a priority of LOAD6 > LOAD7. Connect the DCDU-03C and the BBU using the LOAD6 port. 19 c Installing the Power Cable Between the BBU3900 and the APM30H PWR Installing the Power Cable Between the BBU3900 and the TMC11H Installing the Power Cable Between the BBU3900 and the OMB LOAD1 10A OMB PWR 20 f Installing the FE/GE Ethernet Cable or Optical Fibers BBU3900 Optical fiber Ethernet cable ASN-GW Optical fiber z Use either the Ethernet cable or optical fiber to connect the transmission equipment or gateway. z Install swappable optical modules before installing optical fibers. The performance of an optical module that is exposed to the air for more than 20 minutes may be abnormal. Therefore, you must insert an fiber optic cable into an unpacked optical module within 20 minutes. z Confirm that the FE/GE Ethernet cable is a shield straight-through cable. Ethernet cable Install swappable optical modules Ground the shield layer of an FE/GE Ethernet cable if an FE/GE Ethernet cable is used in an APM30H or TMC11H. For details about the grounding, see the description below. Install a ground clip on an FE/GE Ethernet cable at proper position within 1 m (3'-3 3/8") from the cabinet cable outlet. 1.Determine the position for grounding the FE/GE Ethernet cable, and strip off a sheath of about 25 mm (0 1") to expose the shield layer. 2.Loosen the screws on the ground clip, and route the FE/GE cable through the clip. 3.Confirm that the shield layer of the FE/GE Ethernet cable is in full contact with the ground clip, and tighten the screws on the clip. ground clip 21 g Installing CPRI Optical Fibers Between the BBU3900 and the RRU3702 Install hot-swappable optical modules. RRU3702 RRU3702 LTE WiMAX LTE WiMAX CPRI optical fiber RRU3702 LTE WiMAX WiMAX LTE WiMAX z Install swappable optical modules before installing optical fibers. The performance of an optical module that is exposed to the air for more than 20 minutes may be abnormal. Therefore, you must insert an fiber optic cable into an unpacked optical module within 20 minutes. z Connect the longer exposed end of the optical fiber to the BBU and wrap the end with a tube, and connect the shorter exposed end to the RRU. h Installing a GPS Clock Signal Cable GPS antenna Surge protector on the equipment side Type N female connector GPS clock signal cable GPS clock signal cable Surge SMA male connector Protect SMA T-connector BBU3900 When the BBU3900 is installed in a 19-inch cabinet, ground the surge protector. Confirm that the ground cable is less than or equal to 300 mm (11 13/16") with a cross-sectional area of 6 mm2 (0.01 in.2), and that both ends are terminated with an OT terminal respectively. The installation of an SMA T-connector is for reference only. 22 a. In an APM30H SMA T-connector Surge protector b. In an OMB SMA male connector 1.Install an SMA T-connector. z Install a T-connector inside a cabinet and secure it nearby based on the cable layout. z Wrap the T-connector joints with PVC insulation tape. 2.Install a surge protector. Surge protector 23 j Installing the Monitoring Signal Cable Between the BBU3900 and the EMUA EMUA Monitoring signal cable between the BBU and the EMUA This cable connection scenario is not applicable to the APM30H, TMC11H, or OMB. MON1 Installing the Monitoring Signal Cable Between the BBU3900 and CMUA (APM30H, TMC11H) APM30H TMC11H TMC11H APM30H 24 l Installing the Monitoring Signal Cable Between the BBU3900 and the OMB MON1 RS232/RS485 COM OUT z The MON1 port on the BBU3900 is connected to the COM IN port on the OMB using an alarm signal cable. z The RS232/RS485 port on the AC/DC power module is connected to the COM OUT port on the OMB using a power monitoring signal cable. 25 COM IN Installing RRU3702 Cables a Installing the RRU3702 PGND Cable RRU PGND cable M6 OT terminal 16 mm2 (0.02 in.²) 4.8N•m (42.48 lbf.in.) Two-hole OT terminal z The cross-sectional area of the RRU PGND cable (green and yellow or green) is 16 mm2 (0.02 in.2) (6AWG). z One end connected to the RRU is terminated with an OT terminal (M6) and the other end connected to the ground bar is terminated with a two-hole OT terminal. b Installing the RRU3702 Power Cable RRU LOAD0 Ground point for the shielding layer of the power cable RTN0(+) NEG0(-) DCDU z Connect the DCDU-03B and the RRU using the LOAD0 or LOAD5 port, with a priority of LOAD0 > LOAD5. z When the BBU and RRU are used indoors, do not ground the RRU power cable. z The RRU power cable must be grounded if an RRU is installed outdoors. For details, see the appendix. z For details about how to prepare an OT terminal, see the appendix. RRU power cable 26 Bent OT terminal: Lengths for preparing the RRU power cable 2. To prepare the OT terminal for the RRU power cable, perform the following steps: Determine the lengths of different power cables based on information on the cover plate of the cabling cavity. Cabling cavity Remove the sheath and shielding layer of the cables based on the lengths. Cover plate Precisely follow the instructions on the cover plate on the cabling cavity and the installation guide when preparing the cable. Remove the sheath of the cores. 1.OT terminal for RRU power cable -48 V DC power cable NEG (-) Add an OT terminal to each core. Shielding layer Remove 15 mm (0 9/16'') of the power cable sheath to expose the shielding layer. RTN (+) OT terminal c Installing CPRI Optical Fibers For details, see "Installing CPRI Optical Fibers Between the BBU3900 and the RRU3702" on page 22. Close the cabling cavity. M4 1.4N•m 12.39 lbf.in. Waterproof block Fill vacant cable holes in the cabling cavity using waterproof blocks. 27 d Installing the RF Jumper of the RRU3702 Connections between the 4T4R RRU and the 4-port antenna ANTA_TX/RX ANTB_TX/RX ANTC_TX/RX ANTD_TX/RX RRU Identify the RF ports. The names of the RF ports are silk screened above the port. Connect the jumpers based on the connection relationship shown in the figure above. ANTENNA Keep the dustproof caps on vacant feeder connectors. Wrap the feeder connectors with waterproof tape for outdoor scenarios, as shown in the following figure. PVC insulation tape Waterproof tape PVC insulation tape Dustproof cap Installing the RF jumper Before installing the RF jumper, measure the VSWR of the antenna system. For details, see "Measuring the VSWR of the Antenna System" on page 29. Take insulation and waterproof measures only for the RF jumpers connected to outdoor RRUs. Secure the connector to the port using a wrench [torque: 1 N.m (8.85 lbf.in.)]. Wrap the connector with insulation tape and with waterproof tape. Wrap a layer of insulation tape Wrap three layers of waterproof tape Wrap three layers of insulation tape 28 RF jumper Installing the Outdoor Cable Transfer Box NEG (-) RTN(+) Grounding 10 mm2 (0.02 in.²) -48 V DC 3.3 mm2 (0.005 in. ²) RRU3702 z When the distance between the RRU3702 and the DCDU or APM30H ranges from 6 m (19'-8 1/4'') to 180 m (59'-6 5/8''), install an outdoor cable transfer box on the RRU side. z The core area of the power cable between the outdoor cable transfer box and the DCDU or APM30H is 10 mm² (0.02 in.²). z The core area of the power cable between the outdoor cable transfer box and the RRU is 3.3 mm² (0.005 in. ²). The length of such a cable is 3 m (9'-10 1/8'') to 5 m (16'-4 7/8''). Measuring the VSWR of the Antenna System Measure the VSWR of the antenna system using a Broadband Site Master. Measure the VSWR at the point where the antenna system is connected to the RF port on the RRU. Do not connect an antenna system that has a VSWR of 1.5 or higher to the RRU. 29 Installation Checklist for BBU No. Item All self-made PGND cables are copper-based and are of the correct wire diameters. No breaking devices, such as switches and fuses, are allowed for the electric connection of the grounding system. No short circuits are allowed. Each terminal on the ground bar connects with only one wiring terminal of the PGND cable. The redundant part of the power cable or PGND cable is stripped off rather than coiled. The terminals at both ends of the power cable or PGND cable are securely soldered or crimped. The bare wires and the terminal handles at the wiring terminals are coated with heat-shrinkable tubes. The flat washer and the spring washer are well mounted on all OT terminals. All cables are connected securely and reliably. Pay special attention to the cable connections at the bottom of the cabinet. The cables are neatly and tightly bound. The cable ties are evenly spaced and face the same direction. The power cable, PGND cable, feeder, optical fiber, and the E1/T1/FE signal cable are bound separately with spacing greater than 3 cm (1 3/16"). The cable layout facilitates maintenance and future capacity expansion. The bending radii of the cables meet the requirements. 10 All the labels at both ends of the cables are legible. 11 The extra length of the cable ties is cut and removed. The cut surfaces are smooth and have no sharp edges. 12 The vacant connectors for the cables are properly protected. 30 Installation Checklist for RRU No. Item The RRU and its mounting kits are securely installed. The cover plate is securely installed on the RRU cabling cavity. Waterproof blocks are installed in vacant cable troughs of the RRU cabling cavity. The cover plate of the cabling cavity is securely installed. The vacant RF ports are waterproofed and covered with waterproof caps. The power cable and PGND cable are intact. The terminals at both ends of the power cable or PGND cable are securely soldered or crimped. The flat washer and the spring washer are securely mounted on all OT terminals. The power cable and the PGND cable are intact and correctly connected. They are not short-circuited. The power cable, PGND cable, feeder, optical fiber, and E1/T1/FE signal cable are bound separately with a minimum spacing of 3 cm (1 3/16"). The signal cables are not damaged or broken, and the connectors are intact. 10 Labels at both ends of each cable are correct, legible, and complete. Checklist for the Project Implementation Perform a self-check after the project is complete. Start Prepare a USB disk Power on the BS Upgrade the software and deliver the configuration using a USB disk Start the project self-test function on the Web LMT Is the test successful? Power on the BS No Power off the BS and check the hardware installation Yes Save the report For details about the procedures, see the online help after logging in to the Web LMT. End 31 Appendix c Hoisting the RRU3702 and Mounting Brackets onto the Tower Bind the RRU with a sling. Lifting sling Traction sling Lower edge of the attachment plate Do not lift the RRU by the handle only. Hoist the RRU3702 and mounting brackets onto the tower. z When hoisting the RRU, protect it from colliding with the tower. z The diameters for the sling and traction rope are about 20 mm (0 4/5'') and be less than 25 mm (1"). Ropes must bear a weight more than four times the weight of an RRU. Pulley z Installer A climbs the tower and fixes the crown block onto the tower platform support. Installer A then inserts the hoist thread through the crown block. z Installer C uses the sling to tie the RRU and the mounting brackets according to the figure above. Installer C then uses the traction rope to tie a knot at the handle of the RRU. z Installer B pulls down the sling. Installer C pulls out the traction rope to prevent the RRU and the mounting brackets from colliding with the tower. z Installer A holds on to the RRU and the mounting brackets, and then loosens the knot to release the items. z The previous procedures for lifting an RRU is for reference only. Traction rope Sling 32 b Indicators a BBU-Indicators on the BMPT b BBU-BBBI-Indicators of the RF ports on the baseband unit 33 b Indicators c Indicators on the RRU3702 34 d Preparing OT Terminals for a DCDU Power Cable Lead the wires made of the shielding layers through heatshrinkable tubes. Wrap the PVC insulating tape at the joint where the three wires meet. 35 OT terminal on the shielding layer e Installing a Ground Clip 1. Strip a sheath of 32 mm (1 1/4") from an RRU power cable using a wire stripper. 2. Install a ground clip on the exposed shield layer, and tighten the screws on the ground clip. Ground cable Ground clip RRU power cable z Ensure that the exposed shield layer must be longer than a ground clip. z Do not clip the shield layer of an RRU power cable to a ground clip. 3. Wrap the ground clip using waterproof tape. 4. Wrap the ground clip using PVC insulation tape. z Wrap three layers of tape following the sequence shown in the above figures. When wrapping tape, be sure that each layer of tape overlaps more than 50% of the preceding layer. z The other end of the ground cable connecting to the ground clip is terminated with a one-hole OT terminal with an M8 bolt, and is connected to an external ground bar. 36 HUAWEI TECHNOLOGIES CO., LTD. Huawei Industrial Base Bantian Longgang Shenzhen 518129 People’s Republic of China www.huawei.com
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