Huawei Airbridge CBTS3612-800 User Manual page 40

User Manual
Airbridge cBTS3612-450 12-carrier CDMA Base Station
b) Excess temperature alarm of power amplification
Excess temperature alarm of power amplification reflects the temperature rise of a
power amplification base plate. When a excess temperature alarm of power
amplification occurs, the BHPA will shut down automatically. When the temperature of
the power amplification base plate is 95°C ± 5°C, an excess temperature alarm will
occur to the BHPA and the BHPA shuts down automatically. The restoration threshold
of the excess temperature alarm is 80°C ± 5°C.
At the OMC or the near-end maintenance console of a base station, query the current
alarm of the base station to confirm whether there exists a "Power amplification
overexcitation or excess temperature" alarm.
The troubleshooting process is gradually completed. If the fault cannot be eliminated
in a certain step, please handle it as described in the next one.
Check whether the radio frequency output power of the BTRM is excessively
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high. If it is, please reduce it.
Check whether the fan corresponding to BHPA works normally.
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Check whether the cables between the power amplification module inside BHPA
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and the radio frequency fan monitor board are normally connected.
2)
Abnormal cable/connector connection
BHPA uses blind plug/connector, which is connected via the backplane with the
BTRM, CDU and power supply. And abnormal input/output connection will lead to no
radio frequency signals output from BHPA.
The troubleshooting process is gradually completed. If the fault cannot be eliminated
in a certain step, please handle it as described in the next one.
Plug/unplug the BHPA again to ensure that it is blindly plugged well and normally
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connected with the backplane.
Check whether the cables between BTRM and BHPA, between BHPA and CDU
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and between the power supply and BHPA on the backplane. connected well.
3)
Self damaged
If the BHPA is normally powered, the cables/connectors are connected normally and
input signals are normal, but no radio frequency signal is output from BHPA, the
BHPA is considered damaged and needs replacing.
II. Abnormal radio frequency output signals
Abnormal BHPA radio frequency output signals means that the output power is
smaller than the rated one and the Adjacent Channel Power Ration (ACPR) of the
output signals is. out of function range. The fault are mainly caused by decrease in
power amplification gain, certain power amplification components being damaged or
excessively high output power. Decrease in gain will generate a power amplification
gain decrease alarm. Excessively high input/output power will lead to diffused power
amplification output spectrum and ACPR indices out of function range.
Power amplification gain decrease alarm reflects how a BHPA amplification channel
works. The alarm threshold range is decrease in gain by 3~6dB. If the BHPA gain
decreases over 6dB, a gain decrease alarm will occur. If the BHPA gain decreases
less than 3dB, no gain decrease alarm will occur. If the BHPA gain decreases by
3~6dB, it is normal that a gain decrease alarm occurs or not.
At the OMC or the near-end maintenance console of a base station, query the current
alarm of the base station to confirm whether there exists a "Power amplification gain
decrease" alarm.
The troubleshooting process is gradually completed. If the fault cannot be eliminated
in a certain step, please handle it as described in the next one.
03Q-0112-20020720-120
6 Part Module Fault
6-10