On-site Maintenance Manual
Airbridge cBTS3612 CDMA Base Station
Chapter 4 Component
Replacement
4-11
and a “daisy chain” between those boards, the service will not be
seriously affected.
4.2.5 BTS Resource Distribution Module (BRDM)
While basically observing the “4.1.1 Board Replacement”, we
should also pay attention to the following:
I.
The influence on the service
Replacing a BRDM may interrupt all the services transmitted
through it.
II.
Handling optical fibers
Before replacing the BRDM, disconnect the optical fiber cable
from the board (make notes of the optical interface to which each
optical fiber corresponds). Connect the optical fiber cable back on
the new BRDM after the replacement is finished.
Take caution when plugging and unplugging the optical fiber. If
the fiber connector has a locker tab, remember to press it down
when unplugging the connector.
4.2.6 BTS FAN Module (BFAN)
The physical structure of BFAN 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 BFAN and thus, can be handled flexibly), we should
also pay attention to the following:
