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User Manual
Airbridge cBTS3612-450 12-carrier CDMA Base Station
Other BTRM faults
l
These include the transmission channel clock lost, hardware phase-lock loop lost,
abnormal I 0 value and digital general inverter fault.
RF fan module faults
l
These include the fan monitor board failure to read the temperature sensor, fan
running abnormally, fan monitor board temperature alarm, invalid speed control of the
fan monitor board. And BTRM becomes less sensitive.
6.7.2 Fault Analysis and Location
I. Overexcited receiving channel fault
The processing procedures are as follows. If the problem still cannot be solved in a
certain step, please handle it as described in the next one.
1)
If any interference leads to the overexcited receiving channel fault, it is
necessary to reduce the interference from outside as much as possible instead
of processing the base station.
2)
If it is the FPGA logic fault that leads to overexcited receiving channel, it is
necessary to reset the BTRM.
3)
Replace the BTRM.
II. Software phase-lock losing lock
The software phase-lock lost, if not caused by hardware, usually can be recovered
automatically within 5 minutes. If this fault exists for a long time, handle it as follows. If
this problem still cannot be solved in a certain step, please handle it as described in
the next one.
1)
Eliminate the corresponding BRDM fault.
2)
Replace the corresponding optical fiber.
3)
Replace this BTRM.
III. Abnormal forward link power fault
Abnormal forward link power fault may lead to adjacent area interference, which
should be handled as follows. If the problem still cannot be solved in a certain step,
please handle it as described in the next one.
1)
Check whether the BRDM, BCPM or BCKM are plugged/unplugged well. If this
fault is caused by any of these reasons, no additonal processing is necessary.
2)
Replace the corresponding optical fiber.
3)
Eliminate the faults of the BRDM, BCPM and BCKM.
4)
Replace this BTRM.
IV. Abnormal reverse signal strength indication
Abnormal reverse signal strength may lead to reverse traffic link disconnecting and it
is necessary to check the antenna feeder system.
V. RS485 link fault
RS485 link fault may make the alarm information of a fan monitor board unable to be
reported to the BTRM and closed loop power control invalid. The processing
procedures are as follows. If the problem still cannot be solved in a certain step,
please handle it as described in the next one.
03Q-0112-20020720-120
6 Part Module Fault
6-8
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