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The SDH Board Interconnected with the TOM Board Reports an R_LOS Alarm due to the Optical Module Fault of the TOM Board

Publication Date:  2012-07-25 Views:  43 Downloads:  0
Issue Description
During the deployment of the OSN 6800, the SLQ4 board of the OSN 3500 interconnected with the TOM board reports an R_LOS alarm. The alarm is removed after an optical attenuator is attached to the SLQ4 board, but the self-loop alarm of the TOM board persists. 
Alarm Information
R_LOS 
Handling Process
1. Suspect that the optical interface is faulty. Replace the optical interface of the TOM board. The alarm persists.
2. Configure bidirectional services between the Rx/Tx and the client on the TOM board. The alarm is removed.
3. After a consultation with Huawei experts, it is found that the optical module of the TOM board used during deployment is provided by a Japanese vendor. If no services are configured, the optical board does not report an R_LOF alarm but reports an R_LOS alarm when it receives an all-0s or all-1s signal. To solve this problem, configure services for the TOM board. 
 
Root Cause
The optical module of the TOM board is faulty. 
Suggestions
Null

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