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The OptiX Metro 100 is powered off periodically due to the air circuit breaker problem.

Publication Date:  2019-07-05 Views:  176 Downloads:  0

Issue Description

One OptiX Metro 100 is powered off in the period from 2:00 a.m. to 3:00 a.m. and is restored in the period from 7:00 a.m. to 8:00 a.m.. 

Alarm Information

The opposite end reports the R-LOS alarm. 

Handling Process

1 The error log records all reset time of the equipment.
2 Only the R-LOS alarm is generated, without other alarms or abnormal performance events.
3 Engineers check the power supply in the equipment room. Maintenance personnel feed back that the lighting in the equipment room is normal when the fault occurs.
4 Engineers check the on-site power supply. The power is divided into two channels after being connected to the equipment. One channel is for the lighting, and the other channel is connected to the lightning protection box and then to the power module of the cabinet. The power connection is normal.
5 When the fault occurs, the lighting in the equipment room is normal but the power failure occurs to the equipment. Engineers find that no output voltage exists in the equipment and the lightning protection box by using the multimeter. The abnormal indicator of the lightning protection box is on. Thus, the problem results from the fault of the lightning protection box.
6 Engineers check the lightning protection box and find an air circuit breaker in it. After the air breaker is switched off and then on, the equipment is powered on and is restored.
7 The air circuit breaker is faulty. After the replacement of the air breaker, the problem is solved. 

Root Cause

1 The equipment is faulty.
2 The power fails.
3 The optical cable is faulty. 


The faulty air breaker is sensitive to the temperature change. The equipment room is located in the mountain area and the temperature in the equipment room changes largely. When the temperature decreases to a certain degree at night, the air breaker is switched off and the equipment is powered off. When the temperature increases, the air breaker is switched on and the output voltage is normal. The equipment works normally.