RBS3106 Retrofit Conversion

5/28/2018 RBS3106 Retrofit Conversion

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RBS3106 Retrofit Conversion

Before RBS2106

After RBS3106


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OverviewThis document shows the processes required to convert an existing RBS2106 into afree standing cabinet that contains RB6000 series components in readiness for a

multi-functional basestation.


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Contents

1 Introduction............................................................................................4

2 Objective.................................................................................................5

3 Prerequisites..........................................................................................5

4 Tools Required.......................................................................................5

5 Turning off the RBS...............................................................................6

6 The Conversion (Phase 1)..................................................................6

7 The Central Spine (Phase 2).............................................................14


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1 IntroductionThe diagram below shows the final end product and the modifications that will becovered in this document.Completed RBS3106 Conversion


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2 ObjectiveThis document will act as a step by step guide for modifying the existing RBS2106cabinet and detail the processes necessary to add additional hardware toaccommodate the RBS6000 components.

3 PrerequisitesRefer to the following documentation for the description of RBS6000 components(RU radios and DU baseband modules).1/1551-LZA 701 6001 Uen D - RBS Description15/1551-LZA 701 6001-V2 Uen D - Non-RF Connections26/1551-LZA 701 6001 Uen H Antenna & RF ConnectionsNote: The revisions indicated above are the latest revision of the documents at the time this instructionwas created. Always refer to the latest revision of the Installation Instructions.

4 Tools Required Full set of Torx drivers (thin barrels) Socket set Wire cutters/strippers

SMA spanner 7/16 torch spanner Hacksaw Portable power drill 3.5mm drill bit

Crimping tool


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5 Turning off the RBSBefore the RBS can be turned off, please ensure the following checks/procedureshave been carried out: Authorisation has been granted for the site to be turned off (a lock-down

procedure will need to be administered at the NOC)

Locate the relevant Main Isolator Switch located in the bottom of the cabinet inthe centre.

All tools and equipment have been suitably collected in readiness for work tocommence.

Once all factors have been acknowledged (including confirmation that the site is nowlocked down and off-air), turn the master switch to the OFF position.

It is also advised that at this point the main switch in the electrical meter cabinet isalso turned off to prevent accidental activation of the master ac switch providing acpower during conversion.

6 The Conversion (Phase 1)

Once the BTS has fully powered down, it is then time to start the de-installationprocess. To minimize down time, this process is broken down into phases: Phase 1 De-install entire BTS Phase 2 Install new sub-racks and populate with 6K modules Phase 3 Power up and begin commissioning on temp supply Phase 4 Complete all other de-installation and conversions

Phase 3 & 4 can generally happen in unison, as there are two engineers per site, onecan commission and the other can continue with the conversion.


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6.1 Removal of the interconnecting cablesThere are various connections on the baseband and RF modules which now need tobe removed. Starting at the RF sub-module, start to disconnect the small gold SMAconnectors, silver data cables and exposing the power leads.

Remove the individual modules by unscrewing the top and lower fixings of eachmodule with the relevant Torx screwdriver. Store this in a safe place in readiness fortransportation.

With all the interconnects removed, the sub-rack can be unscrewed and taken out ofthe internal chassis.


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6.2 The modules within the sub-rack can be removed by unscrewing the locationbolts on the top and bottom of each module. This will reduce the weight considerablyand allow easier transportation of the sub-rack.


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6.3 There are metal supports and racks that need to be removed. By drilling thealuminium pop rivets out, using a medium sized drill bit, these are freed.

The cable management rail is removed and kept for re-use. At this stage the righthand side of the BTS is mostly unpopulated.


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The connecting cables and PSUs can be removed from the central spine.

Next, remove the FCU.


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Disconnect the power and battery connections


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The PSUs etc can now be removed, followed by the cable management plate.


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Metal racking to be drilled and support bracket to be unscrewed

Collection of removed hardware:


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Remove the FCU bracket with the suitable torque bit.

7 In the central spine (Phase 2)Remove the old PSU sub-rack and keep handy to be used in a minute.

7.1 Remove the blanking plate from the bottom section and move to the topposition where the old PSU was removed.

Also remove the back plate and discard.


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Install the old PSU sub-rack in the bottom position.

Swapping places, install the blanking plate at the top.

7.2 In order to mount the new PDU on this plate, two holes should be drilled nearthe top. The spacing is determined by the mounting holes in the PDU. Use a 3mmdrill bit to prepare these fixings for the self tapping screws later.


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Remove the sub-rack on the right hand side and the sub-rack on the top left handside.(to be swapped over once the 19 inch adapter rail is installed)

Remove the bottom sub-rack in order to install the adapter rails, then replace it, fixingit to the rail.


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The adapter rails have an arrow marked on one end. Positioning them to the top willdetermine the left and the right sided rail.Note: make sure to align the tops of the rails carefully.


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After the new PDU with an Anderson Connection (DU Slave) reinstate the two sub-racks in opposite positions. The top one moves to the bottom right and the right handside one moves up to the top left.


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You are provided with blanking plates (top) that fit into the sub-racks and fasten withscrews you can salvage from the old discarded FU modules that were taken outearlier.

Now the one-u blanking plate is installed, followed by a three-u and the Cable entryplate.


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In order to position the rectifier unit correctly, it is important to move its mountingbracket to the back position, causing the unit to protrude further to the front.

Install the Rectifier unit in the slot available by feeding all its cables through the brushslot of the cable entry plate from the back first.

Now install the rectifier and the -u blanking plate above it to prevent the loss ofairflow.


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Close the opening above the batteries with the one-u blanking plate provided.

Populate the two open slots in the mid-spine area with two blanking modules.

The SCU is next fixed to the blanking plate in the middle below the fan unit. Fasten

the SCU by means of two self tapping screws provided screwed into the two smallholes you have already drilled previously.


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The excess length of the fan control cables can be pushed into the cavity behind theblanking plate in order to keep the cable management tidy.The existing connectors are retained and fit into the newly fitted SCU.


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Further cable management is achieved by re-installing the cable management rail.

The bottom right sub-rack may now be populated with one DUW(DU Master) on theleft and six RUs to its right, connecting the feeder cables and cords.All the modules are fixed into position at the top and bottom.

Connect the Anderson connection and all the rest of the cables and route neatly withthe help of cable ties.


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RBS3106 Retrofit Conversion

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