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On-site Maintenance Manual
Airbridge cBTS3612 CDMA Base Station
module), and then switch off the -48V DC output of the AC/DC power
supply.
After the replacement is finished, toggle on all the switches on
an order contrary to the switching-off order.
III.
Take down the BESP
Unfix the bolts of the semi-sealing cover on the BESP, remove
the cover, Unplug the E1 trunk cables of two 25-pin interfaces on the
BESP and unscrew the screws at the four corners of BESP to
dismount the BESP at the top of the equipment.
IV.
Install the new BESP
Install the new BESP at the top of the equipment and fasten the
bolts on the four angles of the new BESP, connect the trunk cables at
the 25-pin interface. Finally install the semi-sealing cover.
4.2.2 BTS Control & Clock Module (BCKM)
While basically observing the "4.1.1
should also pay attention to the following:
I.
The influence on the service
A BTS usually is equipped with two BCKMs, which work in an
active/standby mode. When the active board gets out of order, the
service will be automatically switched over to the standby board. In
such case, the faulty board can be replaced directly. However, if the
BTS is equipped with only o ne BCKM, the replacement of it will
interrupt all the BTS services.
Chapter 4 Component
Board Replacement", we
4-9
Replacement
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Table of Contents
Troubleshooting
