The service in the working channel is interrupted after the inter-board wavelength protection is triggered, because the 1+1 inter-board protection is mistakenly configured on the OptiX BWS 1600G.
Symptom
There are alarms on the SDH equipment interconnected to the DWDM network, but the client-side services are configured with the 1+1 inter-board protection and are not interrupted. After checking the entire network, it is found that there is no output power on the client side of the LWC1 board in slot 5 of the OptiX OSN 6800, and the laser on the client side is shut down. In addition, reseating the board cannot solve this problem. After the LWC1 board in slot 5 is moved to another subrack of the local station, the laser on the client side of the LWC1 resumed normal operation.
Cause Analysis
After checking the entire network and analyzing the symptom, the cause for this problem is that the inter-board wavelength protection is mistakenly configured on the LWC1 boards in slot 5 and slot 6. On the existing network, the LWC1 boards in slot 5 and slot 6, however, are considered as two independent boards to carry separate services. When the customer adjusts the optical path, the inter-board wavelength protection is triggered. In this case, the client-side laser on the LWC1 board in slot 5 (the working board) is shut down. As configured, the protection switching mode is configured to the non-revertive mode. Therefore, although the fault that occurs on the LWC1 board in slot 5 is eliminated, the service in the channel cannot be restored, and thus the service is interrupted.
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