Product

OptiX OSN 8800

 

Fault Type

COMMUN_FAIL

 

Symptom

 

The SCC board in slot 28 repeatedly reports transient COMMUN_FAIL alarms.

Cause ***ysis

 

Possible causes of the COMMUN_FAIL alarm are as follows:

 

·         Boards on the NE are being reset (cold or warm).

·         The network cables that cascade subracks do not meet relevant requirements.

·         Boards are faulty.

·         Before this fault occurs, the OptiX OSN 8800 at the station runs normally and no operation is

performed on it.

·         On the NMS, check historical alarms and performance events of the OptiX OSN 8800 and the

time when they are reported. When the SCC board repeatedly reports transient COMMUN_FAIL

alarms, the SCC board reports that the equipment temperature ranges from 70°C to 75°C. Later, An air Con was found to be faulty inside equipment room.

·         A data ***ysis proves that when the ambient temperature is high, the CPU resources and

memory time sequence may be insufficient, and this causes abnormal resets on boards.

 

Conclusion: When Air Con was repaired and temperature of the equipment room became normal, the COMMUN_FAIL alarm was cleared.

it is quite obvious, high ambient temperatures in the equipment room either caused by faulty Air conditioner or high atmospheric temperature, resulting frequent unavoidable alarms for the time being, and may left with some hardware faults, especially in the Raman Amplifiers boards.

typical problem, where there are electrical power shortages.

petty matters yet worth it!

nice experience sharing, seems like you are totally in.

I have come across many alarms associated with high temperatures within equipment room

nice experience sharing

Thanks for the valuable comments.