On-site Maintenance Manual
Airbridge cBTS3612 CDMA Base Station
Chapter 3 Component Failure
Handling
3-18
3)
Eliminate the BRDM, BCPM and BCKM faults;
4)
Replace the BTRM.
IV.
Alarm on reverse signal strength indicator abnormal
Abnormal reverse signal strength may block the reverse service
link. Check the antenna and feeder system for possible problem
causes.
V.
RS485 link failure
RS485 link failure will block the alarm messages of the fan
monitoring board from being reported to the BTRM, and thus result in
the closed-loop power control failure. Follow the handling process
below. Go to next step if the problem cannot be solved with the
current one:
1)
Reinstall the relevant BHPA after power-off, then power on
again;
2)
Replace the fan monitoring board (or the relevant BTS RF
Fan Module);
3)
Replace the BTRM ;
4)
Replace the RF backplane.
VI.
Other problems with the BTRM
Other problems with the BTRM include:
Transmitting channel clock unlocked, hardware phase-lock
unlocked, abnormal
I
0
value and the digital down
frequency-converter failure.
