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DN991456

9 (72)

Issue 3 en

Nokia Proprietary and Confidential

Summary of changes

Version 1, 12

November 1999

Version 2, 22

June 2000:

•

Changed title

•

Added GSM reference to body text

•

Added CE marking

•

Removed RX diversity cable from 2+1 TRX of Figure 24

•

Edited Figure 26

•

Removed note from alternative 1 procedure in Chapter 6.3.2

•

Added BTS safety strap to Figure 1 and to list in Chapter 2.1

Version 3, 18

April 2001:

•

Updated for EDGE

•

Document restructured

Version 3.1, July/October 2002:

•

Modifications to pole mounting kit incorporated (two types of band and
locking device)

•

Note added about horizontal mounting of WCUA cover

All manuals and user guides at all-guides.com

Содержание MetroSite EDGE

Страница 1: ...Nokia MetroSite EDGE Base Station DN991456 Nokia Corporation 1 72 Issue 3 en Nokia Proprietary and Confidential Installation All manuals and user guides at all guides com a l l g u i d e s c o m ...

Страница 2: ...re products cannot be considered binding but shall be defined in the agreement made between Nokia and the customer However Nokia has made all reasonable efforts to ensure that the instructions contained in the documentation are adequate and free of material errors and omissions Nokia will if necessary explain issues which may not be covered by the documentation Nokia s liability for any errors in ...

Страница 3: ...designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment...

Страница 4: ...t be configured for use For use in the GSM 1900 band Channel 512 Channel 585 Channel 586 Channel 587 Channel 610 Channel 611 Channel 612 Channel 685 Channel 686 Channel 687 Channel 710 Channel 711 Channel 712 Channel 735 Channel 736 Channel 737 Channel 810 For use in the GSM 800 band Channel 128 Channel 181 Channel 182 Channel 183 Channel 231 Channel 232 Channel 233 Channel 239 Channel 240 Channel...

Страница 5: ... kit 22 5 Removing the units 25 6 Mounting the BTS 29 6 1 Wall mounting 30 6 2 Pole mounting 34 6 2 1 Attaching the cabinet with the small pole mounting kit 35 6 2 2 Attaching the cabinet with the large pole mounting kit 41 7 Reinstalling the units 49 8 Cabinet cabling 51 8 1 Preparations for cabling 51 8 2 Grounding 53 8 3 Power supply 55 8 4 Transmission unit 58 8 4 1 FC E1 T1 transmission unit ...

Страница 6: ... installation parts checklist 17 Table 4 Checklist for contents of the transportation package for the Nokia MetroSite EDGE Base Station 21 Table 5 Checklist for contents of the optional pole mounting kit 22 Table 6 Parts required for wall mounting 30 Table 7 Parts and pole diameters required for pole installation 34 Table 8 Band length for different pole diameters 41 All manuals and user guides at...

Страница 7: ...e assembled large pole mounting kit 42 Figure 13 Pole bracket pre assembled large pole mounting kit 43 Figure 14 Attaching the mounting rack and the pole brackets 45 Figure 15 Pole mounting with large pole mounting kit 47 Figure 16 Displacing the sealing strip and removing the cable entry block screws 52 Figure 17 Cable routing through the cable entry block 53 Figure 18 Grounding connector alterna...

Страница 8: ...Installation 8 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en All manuals and user guides at all guides com ...

Страница 9: ...e from 2 1 TRX of Figure 24 Edited Figure 26 Removed note from alternative 1 procedure in Chapter 6 3 2 Added BTS safety strap to Figure 1 and to list in Chapter 2 1 Version 3 18th April 2001 Updated for EDGE Document restructured Version 3 1 July October 2002 Modifications to pole mounting kit incorporated two types of band and locking device Note added about horizontal mounting of WCUA cover All...

Страница 10: ...Installation 10 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en All manuals and user guides at all guides com ...

Страница 11: ...n and Operation before starting the installation The following information can be found in this document Working order for installation Preparations before installation Tools and parts required How to safely unpack the delivery Contents of the BTS delivery How to remove and reinstall units How to install the BTS on a wall or a pole How to cable the BTS Completing the installation after commissioni...

Страница 12: ...Installation 12 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en All manuals and user guides at all guides com ...

Страница 13: ...or advice Refer to Table 1for the working order and location of instructions for installing the Nokia MetroSite EDGE Base Station Removing the units before mounting is optional depending on the number of installation personnel on the site Table 1 Working order for installing the Nokia MetroSite EDGE Base Station Activity Instructions Preparations for installation Chapter 3 Unpacking and checking t...

Страница 14: ...Installation 14 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en All manuals and user guides at all guides com ...

Страница 15: ...sed personnel for installing and commissioning the Nokia MetroSite EDGE Base Station 3 1 Checking the delivery Before unpacking any of the packages check that the delivery is correct Confirm that the delivery notes on each package agree with the order note 3 2 Checking the site The BTS site has been planned and prepared according to the specifications given in Nokia MetroSite EDGE Base Station Req...

Страница 16: ...mation on the installation equipment can be found in Nokia MetroSite EDGE Base Station Requirements for Installation and Operation Table 2 Installation equipment checklist Tool Notes Torque driver with 60 mm shaft and T10 Torx bit 4 mm Allen bit Required for Unit retaining screws BTS fixing screws cable entry block screws ground cable fixing Torque socket spanner wrench with 80 mm extension shaft ...

Страница 17: ...uired BTS interfaces and cables Depending on the site solution Wall screws and anchor plugs Supplied by installer for wall mounting refer to Table 6 for screw specifications Flat crimp terminal Supplied by installer for attaching grounding cable to grounding point alternative 1 Cable shoe terminal Supplied by installer for attaching grounding cable to grounding point alternative 2 Plastic cable ti...

Страница 18: ...Installation 18 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en All manuals and user guides at all guides com ...

Страница 19: ...s at least two people The Nokia MetroSite EDGE Base Station weighs 28 to 40 kg 62 to 88 lb depending on the number of TRXs installed 4 1 Working order for unpacking The procedures for unpacking include careful checking of the condition and contents of the delivery If any defects or missing parts are noticed the installation should be stopped and replacement parts ordered The following procedures s...

Страница 20: ...nspect the cover of the BTS for any defects Remove the BTS cover 1 Inspect the cover visually for defects before removing it 2 Open the lock on the bottom of the BTS using the key provided The key will remain in the lock whenever the lock is in the open position 3 Loosen the cover by sliding it along the chassis to disengage the hooks which hold it in place Lift the cover off when the hooks are di...

Страница 21: ...e Refer to Table 4 and Figure 1 for the contents of the transportation package for the Nokia MetroSite EDGE Base Station Table 4 Checklist for contents of the transportation package for the Nokia MetroSite EDGE Base Station Part Notes BTS chassis with the ordered units pre installed Shield units are installed in the slots that are not populated with functional units BTS cover T shaped mounting rac...

Страница 22: ... and chassis with the ordered units Cable cover support 4 unit retaining screws spare parts Mounting rack Cable cover U plate Washer Safety strap Table 5 Checklist for contents of the optional pole mounting kit Part Notes Two front bracket blocks Upper and lower bracket blocks are identical Two back bracket blocks Upper and lower bracket blocks are identical Four Allen screws M6 x 20 For fixing th...

Страница 23: ... in For fixing the front bracket block to the pole larger diameter poles Two locking devices Worm drive clamps with hexagon nut screw for tightening the metal band to the pole larger diameter poles There are two types of locking device as described in Section 6 2 2 Table 5 Checklist for contents of the optional pole mounting kit Continued Part Notes Back blocks Front blocks Metal bands Locking dev...

Страница 24: ...Installation 24 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en All manuals and user guides at all guides com ...

Страница 25: ...ximately 4 5 kg 9 9 lb each Do not remove the shield units Always use the antistatic wrist strap when removing or installing the units For more information on electro static discharge protection refer to Nokia MetroSite EDGE Base Station Warnings and Cautions The wrist strap and the connection point are shown in Figure 3 Figure 3 Connecting the antistatic wrist strap before removing any units ESD ...

Страница 26: ...screws remain in the optimal position for reconnecting 3 Slide the TRX units out of the slots by pulling from the handle on the front panel of the TRX 4 Remove the power supply unit interface unit and transmission unit by pulling each unit out until it comes to a stop Then lift the unit upwards and outwards to remove it See Figure 4 If the unit does not come out easily rock it slightly from left t...

Страница 27: ... Removing the units Handle the units with care Do not knock the units or place them with their connectors facing the ground Prevent dirt water or snow from entering the connectors Power supply unit Interface unit Transmission unit Transceiver units Unit retaining screws All manuals and user guides at all guides com ...

Страница 28: ...Installation 28 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en All manuals and user guides at all guides com ...

Страница 29: ...roSite EDGE Base Station The dimensions of the mounting rack are presented in Figure 5 Screw holes R1 R2 R3 R4 R5 and R6 are for fixing the mounting rack onto the wall or the pole bracket Screw holes B1 and B2 are used for fixing the BTS to the mounting rack Figure 5 Mounting rack dimensions and screw holes NOTE DIMENSIONS mm inch 713 28 07 194 7 64 B1 B2 R1 R2 R3 R4 R5 R6 All manuals and user gui...

Страница 30: ...mounting The mounting rack is attached to a suitable wall with screws and the BTS is then fixed to the mounting rack Screw hole positions are marked out on the wall using the cardboard template which came with the BTS transportation package see Figure 6 The required wall screws are provided by the installer according to the specifications given in Table 6 Table 6 Parts required for wall mounting P...

Страница 31: ...S DN991456 Nokia Corporation 31 72 Issue 3 en Nokia Proprietary and Confidential Figure 6 Cardboard template for aligning wall mounting screw holes All manuals and user guides at all guides com a l l g u i d e s c o m ...

Страница 32: ... a centre punch through the template to mark the fixing points 4 Drill holes R1 and R2 in the wall and clean them out Insert anchor plugs or an appropriate counterpart depending on the material into the wall 5 Position the mounting rack in the correct location on the wall and attach it with screws through holes R1 and R2 see Figure 7 Use a spirit level to set the mounting rack straight adjustment ...

Страница 33: ...ng B1 B2 Mounting rack Attaching the BTS and the mounting rack The view shows how the offset screws and the L beam on the back of the cabinet are attached to the mounting rack Offset fixing screws attached to the L beam 2 pcs R3 R4 B2 B1 R2 R1 Washer L beam Mounting rack All manuals and user guides at all guides com ...

Страница 34: ...d a 6 mm Allen bit with an 80 mm extension See the inset illustration in Figure 7 which shows the rear view of the cabinet 5 If you have removed any of the units proceed to Chapter 7 If you have not removed any units proceed directly to Chapter 8 6 2 Pole mounting Pole mounting includes three work phases 1 Pre assembling the pole brackets 2 Installing the pole brackets and the mounting rack on the...

Страница 35: ...le rack 6 2 1 Attaching the cabinet with the small pole mounting kit The mounting brackets both upper and lower consist of two blocks The front block is attached to the BTS mounting rack and the back block clamps the mounting to the pole The bracket blocks and their bolt holes are shown in Figure 8 Figure 8 Bracket blocks for pole mounting If the diameter of the installation pole is 60 to 90 mm 2 ...

Страница 36: ...s of the bolts Screw on the nuts just enough to secure them on the ends of the bolts See 2 in Figure 9 3 Slide one of the bolts with the square nut into the slot at the side of the front block See 3 in Figure 9 4 Screw the bolt in further enough to prevent the bolt and the square nut from sliding out from the front block See 4 in Figure 9 Figure 9 Pre assembling the pole brackets 1 3 2 4 All manua...

Страница 37: ...r pole bracket to the mounting rack screw the M6 x 20 Allen screws through holes R5 and R6 into the lower front block as shown in Figure 10 Make sure that the three adjacent screw holes are on the upper edge of the block Use a torque driver with a 4 mm Allen bit to tighten the screws to 5 5 Nm 4 06 lb ft 3 Bring the mounting rack pole bracket combination to the pole 4 Position the upper front bloc...

Страница 38: ...e pole brackets Fixing the BTS to the mounting rack 1 Bring the BTS to the mounting rack and hang it on the upper BTS fixing screws B1 and B2 in Figure 11 Do not tighten them yet B1 B2 R2 R1 R6 R5 NOTE Make sure that the three adjacent screw holes are on the upper edge of the bracket block All manuals and user guides at all guides com ...

Страница 39: ...tration in Figure 7 3 Tighten the upper BTS fixing screws B1 and B2 in Figure 11 to 5 5 Nm 4 06 lb ft using a torque driver with a 4 mm Allen bit 4 Tighten the offset screws on the L beam from the underside Use a torque socket spanner wrench with a 6 mm Allen bit and an 80 mm extension to tighten to 12 Nm 8 85 lb ft 5 If you have removed any BTS units proceed to Chapter 7 If you have not removed a...

Страница 40: ...56 Nokia Proprietary and Confidential Issue3en Figure 11 Pole mounting with the small pole mounting kit B1 B2 Mounting rack Attach the BTS to the mounting rack with offset screws at the BTS back side All manuals and user guides at all guides com ...

Страница 41: ...e 1 Assemble the locking device and band by inserting the end of the metal band approximately 25 mm 1 in into the locking device The correct set up of the parts is shown in Figure 12 Bend the surplus end of the metal band underneath the locking device as shown in 3 A in Figure 12 Flatten the bent over end of the metal band to remove any distortion The locking device is now assembled 2 Cut the meta...

Страница 42: ... the metal band free until you have completed the next procedure fixing the front bracket blocks to the mounting rack Legend 1 Metal band 2 Locking device 3 Detail of locking device attached to metal band 4 Detail of entry point for metal band into front bracket block Figure 12 Pole bracket pre assembled large pole mounting kit 1 DN0245434 2 A B 3 4 All manuals and user guides at all guides com ...

Страница 43: ...evice is clamped around the pole Refer to Figure 12 2 Cut the metal band to the appropriate length according to the pole diameter Refer to Table 8 above 3 Route the metal band through the holes in the front block 4 Bend one end of the metal band over to form a hook of about 30 mm 1 2 in in length 5 Insert the hook into the slot at the end of the locking rack 6 Bend the other end of the metal band ...

Страница 44: ... of three adjacent screw holes is on the upper edge of the bracket Use a torque driver with a 4 mm Allen bit to tighten the screws to 5 5 Nm 4 06 lb ft 3 Take the mounting rack pole bracket combination to the pole 4 Wrap the metal band of the upper bracket around the pole 5 Insert the free end of the metal band grooved type into the slot on the worm screw housing as shown in B of Figure 12 Wind th...

Страница 45: ...Nokia Proprietary and Confidential Figure 14 Attaching the mounting rack and the pole brackets B1 B2 R2 R1 R6 R5 NOTE Make sure that the three adjacent screw holes are on the upper edge of the bracket block DN99544792 All manuals and user guides at all guides com ...

Страница 46: ...ts on the lower part of the mounting rack as shown in the inset illustration in Figure 7 3 Tighten the upper BTS fixing screws B1 and B2 in Figure 15 to 5 5 Nm 4 06 lb ft using a torque driver with a 4 mm Allen bit 4 Tighten the offset screws on the L beam from the underside Use a torque socket spanner wrench with a 6 mm Allen bit to tighten to 12 Nm 8 85 lb ft 5 If you have removed any units proc...

Страница 47: ...sue 3 en Nokia Proprietary and Confidential Figure 15 Pole mounting with large pole mounting kit B1 B1 Mounting rack Attach the BTS to the mounting rack with offset screws at the BTS back side B2 B2 DN9913502 All manuals and user guides at all guides com ...

Страница 48: ...Installation 48 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en All manuals and user guides at all guides com ...

Страница 49: ...strap when removing or installing the units For more information on electro static discharge protection refer to Nokia MetroSite EDGE Base Station Warnings and Cautions The wrist strap and the connection point are shown in Figure 3 Reinstalling units 1 Slide the unit into the appropriate slot see Figure 4 2 Press the unit carefully against the connectors on the backplane Do not use excessive force...

Страница 50: ... 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en Caution In order to ensure proper weather shielding all unit retaining screws must be tightened All manuals and user guides at all guides com ...

Страница 51: ... pin configurations refer to Nokia MetroSite EDGE Base Station Product Description The connectors on the units front panels are protected with rubber caps Remove the caps only from those connectors that will be used for BTS cabling 8 1 Preparations for cabling Before starting the cabling do the following 1 Displace the sealing strip around the cable entry block See A in Figure 16 2 Loosen and remo...

Страница 52: ...rip and removing the cable entry block screws When the screws are removed the cable entry block can be split apart at appropriate places for routing the cables through the cable holes For routing the cables through the block see Figure 17 A Sealing strip Allen screws M6 Allen key 4 mm All manuals and user guides at all guides com ...

Страница 53: ...t and UL 1950 3rd edition The additional external ground cable is connected to the grounding connector Ensure that the ground connection is secure and non removable There are two alternative grounding connectors in the BTS chassis see Figure 18 Depending on the local regulations choose the appropriate connector for connecting the grounding cable to the chassis Note that the grounding cable in alte...

Страница 54: ...locking screws and washers from the grounding connector using a torque driver with a 4 mm Allen bit 2 Strip the end of the grounding cable using side cutting pliers and attach a flat crimp terminal to it Fix the terminal to the cable with a crimping tool 3 Insert the crimp terminal between the cabinet and the washer Tighten the screws Alternative 1 Alternative 2 All manuals and user guides at all ...

Страница 55: ...ing cable is correctly positioned and that the nut is securely tightened 8 3 Power supply MAINS VOLTAGE Follow your national legislation when working with the power supply The Nokia MetroSite EDGE Base Station must be permanently wired to a disconnect device such as a circuit breaker in accordance with current local and national wiring standards The following warning applies to the AC power supply...

Страница 56: ...x bit see Figure 19 3 Open up the rubber sealing piece and route the power supply cable through it Close the sealing piece DC power can be fed in with three separate conductors In this case reverse the rubber sealing piece so that the three small recesses are facing each other and form three small holes see Figure 19 Use the three holes for routing the conductor cables 4 Connect the power supply c...

Страница 57: ...n 57 72 Issue 3 en Nokia Proprietary and Confidential Figure 19 Power supply unit and power connector alternatives AC 230 V AC 110 V DC Connector alternatives Sealing for 1 wire Sealing for 3 wires All manuals and user guides at all guides com ...

Страница 58: ...ou connect them to the transmission unit This makes any subsequent maintenance or upgrade procedures easier 8 4 1 FC E1 T1 transmission unit Either separate 75 Ω RX and TX connectors type BT 43 or one 120 100 Ω TX RX connector type TQ can be used The 75 Ω TX and RX connectors are connected to each other with a grounding bridge see Figure 20 If the grounding bridge is removed the grounding of the R...

Страница 59: ...ten the connectors 2 Connect the connector of the received RX signal line to the 75 Ω RX connector on the FC E1 T1 front panel 3 Connect the connector of the transmitted TX signal line to the 75 Ω TX connector on the FC E1 T1 front panel Cabling an FC E1 T1 120 100 Ω transmission unit Connect the connector of TX RX signal line to the 100 120 Ω TX RX connector on the FC E1 T1 front panel see Figure...

Страница 60: ...ctor is always the RX connector of any given transmission interface see Figure 21 The 75 Ω TX and RX connectors are connected to each other with a grounding bridge see Figure 21 If the grounding bridge is removed the grounding of the RX connector s outer conduct changes from direct grounding to capacitive grounding Figure 21 Cabling of the FXC E1 transmission unit RX line IF4 TX line IF4 TX line I...

Страница 61: ...nect the connector of the received RX signal line to the 75 Ω RX connector on IF1 3 Connect the connector of the transmitted TX signal line to the 75 Ω TX connector on IF1 4 Cable the other IFs in the same manner see Figure 21 8 4 3 FXC E1 T1 transmission unit FXC E1 T1 has four 100 120 Ω TX RX connectors type TQ Figure 22 Cabling of the FXC E1 T1 transmission unit FXC E1 T1 RX TX line 4 RX TX lin...

Страница 62: ... FXC E1 T1 front panel see Figure 22 Tighten the connector nut properly 8 4 4 FXC RRI transmission unit Figure 23 Cabling of the FXC RRI transmission unit Cabling the FXC RRI transmission unit Connect the RX TX Flexbus cable from the radio outdoor unit to the TNC connector s on the FXC RRI transmission unit see Figure 23 RX TX Flexbus radio 2 RX TX Flexbus radio 1 FXC RRI All manuals and user guid...

Страница 63: ... the interface unit When you have connected the cables push the rubber seals onto the connectors Cabling the interface unit 1 Connect the external alarms and controls cable to the EAC connector 26 pin mini D connector EAC cable LMP cable connect only before commissioning Q1 cable Interface unit All manuals and user guides at all guides com ...

Страница 64: ...ee also Nokia MetroSite EDGE Base Station Product Description Cabling the TRXs 1 Disconnect the diversity cables from the SMA type connectors on the TRXs if needed 2 Reconnect the diversity cables to form the desired diversity configuration Examples of different sectoring alternatives and their diversity cabling are presented in Figure 25 Diversity cables may only be connected between TRXs that be...

Страница 65: ...IV IN T R X 1 T R X 2 DIV IN DIV OUT DIV OUT DIV IN DIV OUT DIV IN T R X 1 T R X 2 T R X 4 DIV OUT DIV IN DIV IN DIV OUT DIV OUT DIV OUT DIV IN DIV IN T R X 4 T R X 3 T R X 1 T R X 2 DIV OUT DIV IN DIV IN DIV OUT DIV OUT DIV OUT DIV IN DIV IN T R X 1 T R X 2 T R X 4 T R X 3 Possible antenna solutions 2 single port antennas 1 dual port antenna 1 dual port and 1 single port antenna 3 single port ant...

Страница 66: ...arts of the cable ties 5 Route the transmission cables the grounding cable and the cables coming from the interface unit behind the perforated plastic panel at the lower edge of the BTS see 2 in Figure 26 Fix the cables to the perforated panel with at least two cable ties Use side cutting pliers to cut off the extruding parts of the cable ties 6 Attach the cable cover support on the grips at the f...

Страница 67: ...DN991456 Nokia Corporation 67 72 Issue 3 en Nokia Proprietary and Confidential Figure 26 Routing the cables and closing the cable cover A B Cable cover Cable cover support All manuals and user guides at all guides com ...

Страница 68: ...Installation 68 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en All manuals and user guides at all guides com ...

Страница 69: ...ace unit 3 Proceed to the BTS commissioning tasks Refer to Nokia MetroSite EDGE Base Station Commissioning Fitting the cover and locking the cabinet 1 Bring the BTS cover to the BTS chassis see Figure 27 Attach the safety strap to the fixing point provided under the top of the cover 2 Make sure that the cover is secured with the safety strap see Figure 27 3 Place the cover over the cabinet and ali...

Страница 70: ...tion 70 72 Nokia Corporation DN991456 Nokia Proprietary and Confidential Issue3en Figure 27 Hanging the BTS cover Fixing point for safety strap under the cover top All manuals and user guides at all guides com ...

Страница 71: ...board template 30 commissioning 69 completing the cabling 66 cover 69 D DC power 56 delivery contents 21 dimensions mounting rack 30 pole diameter 35 wall space 32 direct grounding 58 diversity cabling alternatives 64 E EAC connector 63 electro static discharge ESD protection 25 49 F FC E1 T1 58 FXC E1 60 FXC E1 T1 61 FXC RRI 62 G grounding 53 grounding bridge 58 I installing BTS onto a pole 37 BT...

Страница 72: ...y unit cabling 55 preparations cabling 51 Q Q1 connector 64 R removing units 25 S safety strap 69 sealing strip 51 sectoring solutions 64 shield units 21 25 49 site requirements 15 SMA type connectors 64 T template for wall mounting 30 tools for installation 16 transceiver unit TRX cabling 64 transmission unit cabling 58 transportation package 19 U unit installation 49 unit removal 25 unpacking th...

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