Hello,
This alarm is reported when the difference between the RTWP/RSSI of the main RX channel and the RTWP/RSSI of the diversity RX channel exceeds 32 dB (configurable). The receive sensitivity of the RF unit decreases. The demodulation performance of the cell deteriorates. The uplink coverage shrinks.
Reasons:
1- The main RX channel or diversity RX channel of the RF unit is faulty.
2- The setting of attenuation on the RX channel of the RF unit is incorrect.
3- External interferences exist on the main or diversity antenna of the RF unit.
4- The feeder connected to the RF unit is faulty, which results in a high passive intermodulation power of the main antenna.
5- Antenna cables are connected incorrectly.
Correlated Alarms:
RF Unit RX Channel RTWP/RSSI Too Low: This alarm is reported when the RTWP/RSSI on the RX channel of the RF unit is lower than the threshold. The receive sensitivity of the RF unit decreases. The demodulation performance of the cell deteriorates. The uplink coverage shrinks.
If the RTWP/RSSI on all RX channels of the cell is too low, the ongoing services of the cell may be disrupted.
Useful MML command from Terminal End SET GCELLADMSTAT to block or unblock the problem cells.
Need to check the feeder configuration from web Lmt.
MML command: Set BTSRXUBP, Mrfu/Grfu sending receiving mode should be according to antenna connection in site.(double feeder(1 tx+2 rx or single feeder(1 tx+2 rx)
Need to check the MRFU cascading cable(The connection should like this: Rx_in to Rx _out from both MRFU.
Need to check the RX port of the MRFU by interchanging it with another MRFU and if it is faulty the MRFU should be replaced.
Hope it can help you!
Thanks
