Symptom
The TN1M1LOG01 board in the OptiX OSN 6800 on a network is tested on site. The input optical power at certain client-side interfaces on the board is about -12.5 dBm (the client-side receiver sensitivity is -17 dBm) or sometimes -60 dBm. In addition, the board keeps reporting the R_LOS alarm for seconds to ten minutes at these faulty client-side interfaces.
Cause analysis
The SCP6F44-GL-BWE optical module is used on the client side of the TN1M1LOG01 board.
A fiber is used to self-loop the receive and transmit optical interfaces on this optical module and limit the input optical power of the module to a value that does not exceed the threshold. When the input optical power is high, the board does not report the R_LOS alarm. When the input optical power is low, the board keeps reporting R_LOS alarms. When the input optical power is within the normal range, R_LOS alarms are reported intermittently.
Procedure
Ignore this problem. It does have any negative effect. The R_LOS alarm is not reported when normal signals are input to the client-side module on the TN1M1LOG01 board with the SCP6F44-GL-BWE optical module. The R_LOS alarm is reported only when unmodulated signals are input to the client-side module on the board.
Result
The problem is solved.
