Replacing The Uscu - Huawei BBU3900 Hardware Maintenance Manual

BBU3900
Hardware Maintenance Guide
Context
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The active/standby switchover may result in NodeB resetting or service disruption.
Procedure
Step 1 Remove the faulty UTRP.
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Step 2 Install a new UTRP.
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Step 3 Check the running status of the new UTRP.
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Postrequisite
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5.8 Replacing the USCU

The Universal Satellite card and Clock Unit (USCU) in the BBU receives clock signals such as
the GPS, RGPS, BITS, and M-1PPS signals. In addition, it transmits or receives 1PPS+TOD
clock signals.
Issue 03 (2010-06-05)
The UTRP is hot swappable.
The BBU is configured with one active UTRP. Replacing the UTRP disrupts all the services
carried on the base station.
The BBU is configured with one active UTRP and one standby UTRP. When the active
UTRP is being replaced, an active/standby switchover is performed automatically. After
the switchover is successful, the standby UTRP becomes the active UTRP and takes over
the services, and the new UTRP becomes the standby UTRP. Powering off the eNodeB is
not required during replacement. Replacing the standby UTRP does not disrupt the services.
When replacing the board, do not power off the eNodeB. You only need to remove the
faulty board, and then insert a new board into the original slot.
CAUTION
Attach temporary labels to the cables on the faulty UTRP, and then disconnect the cables.
Remove the screws on the panel of the faulty UTRP.
Turn the ejector lever outwards, and then pull the faulty UTRP out of the slot.
Place the faulty UTRP in an ESD bag.
Insert a new UTRP into the slot, and then slide the board until it is in position.
Turn the ejector lever inwards, and then tighten the screws on the panel of the new UTRP.
Connect the cables to the ports on the panel of the new UTRP according to the recorded
cable connections.
NOTE
For details on the LED of the UTRP, see the UTRP.
Record the bar code of the replaced board.
Contact the local Huawei office to handle the faulty UTRP.
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5 Replacing Components of the BBU3900
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