On-site Maintenance Manual
Airbridge cBTS3612 CDMA Base Station
Chapter 3 Component Failure
Handling
3-7
2)
If other boards are generating alarms at the same time,
there may be a problem with the BCKM, refer to “3.4 BTS
Control & Clock Module (BCKM)” for solutions.
3)
If the problems still can not be solved with the above two
steps, there must be something wrong with the backplane
of the baseband subrack. Replace it.
III.
Abnormal board temperature
If the baseband subrack has an abnormal board temperature,
we first need to find out if the baseband subrack fan module is
working properly or if the ventilation channel is blocked; If the BTRM
has an abnormal temperature, we will have to find out if the BTS RF
Fan Module (BRFM) is working properly.
If the problems sustain after we have gone through the above
possibilities, it should be the relevant board failure and it needs to be
reset or replaced.
IV.
No signal detected at the optical interface
Such problem mainly occurs in the BRDM and BTRM. Here we
first need to check the relevant optical interface and see if the optical
fiber is plugged in properly or if the boards and modules at both
sides of the cable are working properly, or if it is damaged or broken.
If so, go to the relevant sections in this chapter for solutions. If all
other possibilities have been eliminated, there must be something
wrong with certain board or module, reset or replace them.
V.
Other faults
Other possible common failures include:
