Huawei Technologies RRU3702-2500 Remote Radio Unit User Manual Installation Guide

Huawei Technologies Co.,Ltd Remote Radio Unit Installation Guide

Contents

Installation Guide

HUAWEI TECHNOLOGIES CO., LTD.SingleRAN WiMAX-LTE V100R001C00Quick Installation Guide(Co-RRU3702)Issue: XXDate: 2011-XX-XX
1Installation ToolsInstallation Scenarios Requirements for Dimensions and Installation SpaceInstallation ProcedureInstalling the BBU3900Installing the RRUConnecting CablesInstalling BBU3900 CablesInstalling RRU3702 CablesInstalling the Outdoor Cable Transfer BoxMeasuring the VSWR of the Antenna SystemInstallation Checklist for the BBUInstallation Checklist for the RRUChecklist for the Project ImplementationAppendixContentsCopyright © Huawei Technologies Co., Ltd. 2011. All rights reserved.234679151926292930313132
2Installation ToolsMultimeterUtility knifeHammer drill (with bit 14) Vacuum cleanerESD glovesHeat gunFlat-head screwdriver(M3 to M6)Wire stripperWire cutterAdjustable wrench[with a diameter of at least 32 mm (1 1/4")]Torque screwdriverMeasuring tapeLevelMarking pen[with a diameter of no more than 10 mm (0 3/8")]Combination wrenchPhillips screwdriver(M3 to M6)Torque wrenchCrimping pliersRubber mallet[21 mm (0 13/16") to 21 mm (0 13/16")] for pole installation[17 mm (0 11/16") to 17 (0 11/16")]for wall installation
3Installation ScenariosbRRU3702 Installation ScenariosBBU3900 Installation ScenariosIn a 19-inch indoor rackOn a pole On U-steelOn angle steelOn a wallOn a wire poleazA 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.zA module must be powered on within 24 hours after being unpacked or after being powered off for maintenance.In an APM30H In a TMC11H In an OMBFor details about the installation of the APM30 and the TMC11H, see the APM30H Installation Guide. BBUBBUBBUBBU
4Requirements for Dimensions and Installation SpaceDimensionsDimensions 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'')Dimensions of the RRU3702: 480 mm (1'-6 7/8'') x 356 mm (1'-2'') x 120 mm (4 3/4'')a356 mm (1'-2'') 120 mm (4 3/4'') 158 mm (6 1/4'')374 mm (1'-2 3/4'')484 mm (1'-7 1/16'')480 mm (1'-6 7/8'')310 mm (12 3/16'')86 mm (3 3/8'')442 mm (1'-5 3/8'')Dimensions of the BBU: 442 mm (1'-5 3/8'') x 310 mm (1'-0 3/16'') x 86 mm (3 3/8'')Space Requirements for the BBU3900 InstallationIn a 19-inch rackb70 mm (2 3/4'')25 mm (1'')25 mm (1'')
5≥500 mm (1'-7 11/16'')≥800 mm(2'-7 1/2'')≥600 mm (1'-11 5/8'')Installation Spacec300 mm (11 13/16'')100 mm (3 15/16'')600 mm (1'-11 5/8'')400 mm (1'-3 3/4'')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.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.200 mm (7 7/8'')≥300 mm (11 13/16'')≥300 mm (11 13/16'')≥300 mm (11 13/16'') 200 mm (7 7/8'')Recommended space for RRU3702 installation Minimum space for RRU3702 installationRecommended horizontal space for RRU3702 installation Minimum horizontal space for RRU3702 installationRecommended vertical space for RRU3702 installation Recommended vertical space for RRU3702 installation≥600 mm (1'-11 5/8'')≥600 mm (1'-11 5/8'') 100 mm(3 15/16'')400 mm (1'-3 3/4'') 400 mm (1'-3 3/4'')≥300 mm (11 13/16'')≥500 mm (1'-7 11/16'')≥500 mm (1'-7 11/16'')300 mm (11 13/16'')300 mm (11 13/16'')
6Installation Procedure
7Installing the BBU3900aInstalling the BBU3900 in a 19-Inch RackbReversely installed mounting earsInstalling the BBU3900 in an APM30Ha. Verify that the BBU3900 mounting ears are regularly installed in a 19-inch rack, and are reversely installed in an APM.b. Install the BBU3900 in an APM30H using a binding bracket.Reversely installed mounting earsBounding bracketRegularly installed mounting ears Reversely installed mounting earsFor easy installation, remove the two ground screws on the right side of the BBU panel before installing the BBU.Regularly installed mounting earsBBUM6X162 N.m(17.70 lbf.in.)M6X162 N.m(17.70 lbf.in.)
8eInstalling the BBU3900 in an OMBcInstalling the BBU3900 in a TMC11HBBU3900Reversely installed mounting earsFANReversely installed mounting earsM6X162 N.m(17.70 lbf.in.)M6X162 N.m(17.70 lbf.in.)Remove the two ground screws on the right side of the BBU panel before installing the BBU.
9Tighten the screws when installing the RRU. Loosen these screws when removing the RRU.Installing the RRUaInstalling the RRU on a Pole [Diameter: 60 mm (2 3/8'') to 114 mm (4 1/2'')]zThe RRU must be supported by foam or cardboard for protection.zThe 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.Dual-nut boltMain bracketAuxiliary bracket1200 mm (3'-11 1/4'') to 1600 mm (5'-3'')When installing the main bracket, ensure that the contact piece on the bracket is fixed.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.1. Install the main bracket.60 mm (2 3/8'') to 114 mm (4 1/2'')The recommended diameter of the pole is 80 mm (3 1/8").Mounting brackets for RRUFixing hoopLogo on the cover plate Transfer pieces Tighten the screws when removing the RRU.Main bracketSpring plate≤10°RRUAngle steel or U-steelThe angle between the vertical and the angle steel or U-steel or angle steel where the RRU is installed must be less than or equal to 10 degree.
10Installing Two RRUs on a Pole[Diameter: 60 mm (2 3/8'') to 114 mm (4 1/2'')]bTighten 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.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.3. Install the RRU on the main bracket. When you hear click sound, the RRU is securely installed.The arrows on the main bracket point upwards.1. Install the first RRU. 2. Install the second main bracket.40 N.m(354.03 lbf.in.)
11Ensure that the cabling cavities of the two RRUsface the same direction when installing the RRUs.4. Install the second RRU on the main bracket.3. Swap the front cover and the transitional piece at the rear of the second RRU.5 N.m(44.25 lbf.in.)M6X16Cabling cavityIn standard modeIn reverse modezThe process for installing the RRU on U-steel is the same as the procedure for installing the RRU on a pole.zYou are advised to install only one RRU on U-steel.Top views of four installation modescInstalling the RRU on a U-Steel50 mm (1 15/16'') to 100 mm (3 15/16'')30 mm (1 3/16'') to 50 mm (1 15/16'')U-steel
12Top views of the installation modesdInstalling the RRU on Angle SteelAngle steel63 mm (2 1/2'') to 80 mm (3 1/8'')63 mm (2 1/2'') to 80 mm (3 1/8'')You are advised to install only one RRU on a wire pole.eInstalling the RRU on a Wire Pole [Diameter: 300 mm (11 4/5'') to 390 mm (1' 3 3/8'')]zThe process for installing the RRU on angle steel is the same as the procedure for installing the RRU on a pole.zYou are advised to install only one RRU on angle steel.Main bracket35N•m(309.78 lbf.in.)
13128 mm(5 1/16'')123 mm(4 13/16'')RRU1200 mm (3'-11 1/4") to 1600 mm (5'-3")fInstalling the RRU on a WallAuxiliary bracket123 mm(4 13/16'')When the RRU is installed on a wall, the requirements are as follows:zFor one RRU, the wall has a weight-bearing capacity of 68 kg (149.94 lb).zThe 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.Ø14After the expansion bolt is removed, dispose of the plastic tube.90°55 mm to 60 mm20 mm (13/16") to 30 mm (1 3/16")M10x65 boltSpring washer 10Plastic tubeFlat washer 10Expansion tubeDo 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.2. Drill holes at the anchor points and then install the expansion bolt assemblies.It is recommended that the auxiliary bracket be 1200 mm (3'-11 1/4") to 1600 mm (5'-3") above the ground.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.
14Arrows point upwards30 N.m(265.52 lbf.in.)M103. 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").4. Install the main bracket.5. Install the RRU.
15Connecting CablesaCable Connections in General (RRU3702)RS485 portExternal power supplysystemOptical fiberEthernet cableTo a Boolean sensorConnected through the optical fiber or Ethernet cableRRU power cableCPRI optical fiberBBU power cablezThe LMPTb, LMPTw, LBBPc, UPEUc, and FANc are used as examples.zRRU3702s of a WiMAX-LTE BS in co-RRU mode supports only the chain topology. zAn 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.zConfigure the DCDU based on onsite situations.DCDUConfiguration Type：WiMAX: S(2/2/2), 2T2R, 10M HzLTE:S(1/1/1), 2T2R, 20M Hz WiMAX LTE2C 1CC=carrier,1C=1carrier,2C=2 carrierANTANTANTANTANTANTColor-codingASN-GW
16DCDUWiMAX LTE2C 1CC=carrier,1C=1carrier,2C=2 carrierRS485 portOptical fiberEthernet cableTo a Boolean sensorConnected through the optical fiber or Ethernet cableRRU power cableCPRI optical fiberBBU power cableConfiguration Type：WiMAX: S(2/2/2), 4T4R, 10M Hz LTE:S(1/1/1), 4T4R, 10M HzANTColor-codingExternal power supplysystemANT ANTASN-GW
17DCDUWiMAX LTE1C 1CC=carrier,1C=1carrierRRU power cableBBU power cableConfiguration Type：WiMAX: S(1/1/1), 4T4R, 10M Hz LTE:S(1/1/1), 4T4R, 20M HzANT ANT ANTCPRI optical fiberRS485 portTo a Boolean sensorOptical fiberEthernet cableConnected through the optical fiber or Ethernet cableASN-GWExternal power supplysystemColor-coding
18bCable Connections of the OMBOMB PGND cableFE cableAC input power cable CPRI optical fiberMonitoring cable between the monitor board and the UPEU Input power cable of the BBU Monitoring cable between the EPS30-4815 and the monitor boardBefore 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.ac
BBU power cable19•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.Installing BBU3900 CablesaInstalling the BBU3900 PGND CablebInstalling the -48 V DC Power Cable of the BBU3900BBU PGND cable Two-hole OT terminalOT terminalBBUBBUBBUDCDUAPM30H TMC11HBBUDCDU-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.
20dInstalling the Power Cable Between the BBU3900 and the TMC11HeInstalling the Power Cable Between the BBU3900 and the OMBPWRLOAD1 10AOMBPWRcInstalling the Power Cable Between the BBU3900 and the APM30H
21Installing the FE/GE Ethernet Cable or Optical FibersfASN-GWOptical fiber Ethernet cableBBU3900Ethernet cableOptical fiberInstall swappable optical moduleszUse either the Ethernet cable or optical fiber to connect the transmission equipment or gateway.zInstall 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.zConfirm that the FE/GE Ethernet cable is a shield straight-through cable.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.ground clipInstall 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.
22gInstalling CPRI Optical Fibers Between the BBU3900 and the RRU3702RRU3702hInstalling a GPS Clock Signal CableRRU3702 RRU3702WiMAXLTEWiMAXzInstall 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.zConnect 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.CPRI optical fiberInstall hot-swappable optical modules.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.SMA male connectorType N female connectorGPS clock signal cableSurge protector on the equipment sideProtectSurgeGPS antennaBBU3900GPS clock signal cableSMA T-connectorThe installation of an SMA T-connector is for reference only.LTEWiMAX LTEWiMAX LTEWiMAX
23b. In an OMB1.Install an SMA T-connector.2.Install a surge protector.Surge protectorSMA male connectorzInstall a T-connector inside a cabinet and secure it nearby based on the cable layout.zWrap the T-connector joints with PVC insulation tape.a. In an APM30HSMA T-connectorSurge protector
24kInstalling the Monitoring Signal Cable Between the BBU3900 and CMUA (APM30H, TMC11H)Installing the Monitoring Signal Cable Between the BBU3900 and the EMUAMonitoring signal cable between the BBU and the EMUA jThis cable connection scenario is not applicable to the APM30H, TMC11H, or OMB.EMUAMON1APM30H TMC11HAPM30HTMC11H
25lInstalling the Monitoring Signal Cable Between the BBU3900 and the OMBMON1RS232/RS485COM OUT COM INzThe MON1 port on the BBU3900 is connected to the COM IN port on the OMB using an alarm signal cable.zThe 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.
RRUDCDULOAD0NEG0(-)RTN0(+)26Installing RRU3702 CablesaInstalling the RRU3702 PGND CableRRU PGND cable16 mm2 (0.02 in.²)Two-hole OT terminalOT terminalbInstalling the RRU3702 Power CableGround point for the shielding layer of the power cablezThe cross-sectional area of the RRU PGND cable (green and yellow or green) is 16 mm2(0.02 in.2) (6AWG).zOne 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.zConnect the DCDU-03B and the RRU using the LOAD0 or LOAD5 port, with a priority of LOAD0 > LOAD5.zWhen the BBU and RRU are used indoors, do not ground the RRU power cable.zThe RRU power cable must be grounded if an RRU is installed outdoors. For details, see the appendix. zFor details about how to prepare an OT terminal, see the appendix.Bent OT terminal:RRU power cable4.8N•m(42.48 lbf.in.)M6
271.4N•m12.39 lbf.in.M4Fill vacant cable holes in the cabling cavity using waterproof blocks.Installing CPRI Optical FibersFor details, see "Installing CPRI Optical Fibers Between the BBU3900 and the RRU3702" on page 22.cClose the cabling cavity.Precisely follow the instructions on the cover plate on the cabling cavity and the installation guide when preparing the cable. Cover plateCabling cavityShielding layerRemove the sheath and shielding layer of the cables based on the lengths.Remove the sheath of the cores.Add an OT terminal to each core.Remove 15 mm (0 9/16'') of the power cable sheath to expose the shielding layer.1.OT terminal for RRU power cableLengths for preparing the RRU power cableNEG (-)RTN (+)-48 V DC power cableOT terminal2. 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.Waterproof block
28dInstalling the RF Jumper of the RRU3702 Connections between the 4T4R RRU and the 4-port antennaIdentify 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.Wrap a layer of insulation tapeWrap three layers of waterproof tapeWrap three layers of insulation tapeSecure 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.Before installing the RF jumper, measure the VSWR of the antennasystem. For details, see "Measuring the VSWR of the Antenna System" on page 29.Installing the RF jumperTake insulation and waterproof measures only for the RF jumpers connected to outdoor RRUs.ANTENNARRURF jumperWaterproof tapeDustproof capPVC insulation tapeKeep 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 tapeANTA_TX/RX ANTB_TX/RX ANTC_TX/RX ANTD_TX/RX
29Installing the Outdoor Cable Transfer BoxMeasuring the VSWR of the Antenna SystemzWhen 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.zThe core area of the power cable between the outdoor cable transfer box and the DCDU or APM30H is 10 mm² (0.02 in.²). zThe 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'').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.GroundingRTN(+)NEG (-)10 mm2 (0.02 in.²)-48 V DC RRU37023.3 mm2 (0.005 in. ²)
30No. Item1 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.2 The redundant part of the power cable or PGND cable is stripped off rather than coiled.3 The terminals at both ends of the power cable or PGND cable are securely soldered or crimped.4 The bare wires and the terminal handles at the wiring terminals are coated with heat-shrinkable tubes.5 The flat washer and the spring washer are well mounted on all OT terminals.6 All cables are connected securely and reliably. Pay special attention to the cable connections at the bottom of the cabinet.7 The cables are neatly and tightly bound. The cable ties are evenly spaced and face the same direction.8 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").9 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.Installation Checklist for BBU
31Installation Checklist for RRUUpgrade the software and deliver the configuration using a USB diskStart the project self-test function on the Web LMTSave the reportEndIs the test successful? Power off the BS and check the hardware installationStartPower on the BSPrepare a USB diskYesNoPower on the BSChecklist for the Project ImplementationPerform a self-check after the project is complete.For details about the procedures, see the online help after logging in to the Web LMT.No. Item1 The RRU and its mounting kits are securely installed. 2 The cover plate is securely installed on the RRU cabling cavity.3 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. 4 The power cable and PGND cable are intact.5 The terminals at both ends of the power cable or PGND cable are securely soldered or crimped. 6 The flat washer and the spring washer are securely mounted on all OT terminals.7 The power cable and the PGND cable are intact and correctly connected. They are not short-circuited.8 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").9 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.
32AppendixHoist the RRU3702 and mounting brackets onto the tower.Bind the RRU with a sling.zInstaller 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.zInstaller 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. zInstaller 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.zInstaller A holds on to the RRU and the mounting brackets, and then loosens the knot to release the items.zThe previous procedures for lifting an RRU is for reference only.zWhen hoisting the RRU, protect it from colliding with the tower.zThe 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.Lifting slingLower edge of the attachment plateTraction slingDo not lift the RRU by the handle only.Traction ropeSlingPulleyHoisting the RRU3702 and Mounting Brackets onto the Towerc
33IndicatorsbBBU-Indicators on the BMPTaBBU-BBBI-Indicators of the RF ports on the baseband unitb
34IndicatorsbcIndicators on the RRU3702
35Preparing OT Terminals for a DCDU Power CabledLead the wires made of the shielding layers through heat-shrinkable tubes.Wrap the PVC insulating tape at the joint where the three wires meet. OT terminal on the shielding layer35
36Installing a Ground ClipezWrap 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.zThe 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.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.zEnsure that the exposed shield layer must be longer than a ground clip.zDo not clip the shield layer of an RRU power cable to a ground clip.4. Wrap the ground clip using PVC insulation tape.3. Wrap the ground clip using waterproof tape.Ground cableGround clipRRU power cable36
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