On-site Maintenance Manual
Airbridge cBTS3612 CDMA Base Station
Chapter 4 Component
Replacement
4-13
as the board removal & installation and the MS dial-up test, are not
applicable to BRFM and thus, can be handled flexibly), we should
also pay attention to the following:
I.
The influence on the service
If a certain BRFM does not work properly, we need to switch it
off from the BTS switch box before replacing it (note that a switch
serves a group of BHPA, BTRM and BRFM).
II.
Handling optical fibers
When putting on the new BRFM, remember to put the optical
fiber in the notch in the lower-right corner of the module.
III.
Handling relevant cables
When detaching the BRFM, remember to disconnect the cables
on it (make notes of the cabling destination so that the cables can be
plugged back in correctly). When the new BRFM is installed, connect
the cables on it correctly.
4.2.9 BTS High Power Amplifier Unit (BHPA)
The physical structure of BHPA is rather different from that of
the boards in the baseband subrack, therefore, while basically
observing the “4.1.1 Board Replacement” (some processes, such
as the board removal & installation and the MS dial-up test, are not
applicable to BHPA and thus, can be handled flexibly), we should
also pay attention to the following:
