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Reply To: RBS/BSC Ericsson

#41539
ATTO
Guest

Hello,

Fault No.
SO CF I2A:57

Fault name
RX path imbalance

Related faults
AO RX I2A:5 – RX path A imbalance

AO RX I2A:6 – RX path B imbalance

AO RX I2A:7 – RX path C imbalance

AO RX I2A:8 – RX path D imbalance

AO TX I1B:35 – RX path imbalance

SO CF RU:40 – Antenna

Description
This fault occurs together with a pinpointed antenna, if the difference in signal strength between two antennas in the same antenna system exceeds the limits defined using the OMT function Define RX Path Imbalance Parameters. If the class 1 limit is exceeded, the related fault AO TX I1B:35 is also issued and the TX will be disabled.

The supervision of this fault is based on measurements over a long time duration, hence the fault does not cease as soon as the fault condition is corrected. The RX imbalance monitor must therefore be used to verify the correction of the fault condition.

When the fault condition has been corrected, reset the TRU to cause the fault to terminate immediately.

Observe, If the fault condition was not corrected, the fault will be reported again when at least the minimum number of samples has been collected. The minimum number of samples is defined by the Define RX Path Imbalance Parameters function in the OMT.

Action
Follow the instructions below until the fault is corrected:

Check the defined RX path invariance limits using the Define RX Path Imbalance Parameters function in the OMT for the faulty antenna system.

Check the TX cables/feeders, cable connections inside and outside the cabinet and antennas, for example with Antenna System SWR tests. For information about how to perform a SWR test see Verifying Antenna Systems or Antenna System Tests in the CPI for the relevant RBS.

Reset the TRU

Regards.