SNCP Protection Switching Fails Due to Incorrect Fiber Connections

Procedure

1. Confirm that the SNCP protection group is configured correctly.
2. Confirm that the boards on the working and protection paths work normally and have not reported any fault-related alarm.
3. Check the network configurations against the fiber connection diagrams in engineering design documents and find that fiber connections are established incorrectly at an OTM site. After correcting the fiber connections, perform SNCP protection switching again and find that protection switching is successful.

   The following figure shows the fiber connection diagram for site OTM.

   
    

   The following figure shows how the fibers at site OTM are connected.