Incorrect Client-Side Service Type Causes Failure of Interconnection With a Rout

Symptom

On a network, an ETMX board on the OptiX BWS 1600G is used to receive a 2.5 Gbit/s service from a router on the client side. Client-side channels run properly after an expansion is performed on the network.

When the ETMX board on the OptiX BWS 1600G receives the 2.5 Gbit/s service, interconnections with ports on the router are successful but exchanges of protocols fail. After an outloop is configured on the ETMX board at the local end by using the NMS to loopback the service to the router, port interconnections and protocol exchanges are successful. After an inloop is configured on the WDM-side optical port on the ETMX board at the remote end by using a fiber patch cord to loopback the service to the router, port interconnections are successful but protocol exchanges fail. This indicates that the fault lies on the WDM-side link or interconnected ports.

Cause analysis

The analysis of the problem is as follows:

1. An SDH ***yzer is used to test the WDM-side channel after the expansion is performed. No exception is found.
2. After the outloop on the ETMX board at the local end is performed, port interconnections and protocol exchanges are successful. This indicates that the router is running properly.
3. After the inloop on the ETMX board at the remote end through a fiber patch cord is performed, protocol exchanges fail. This indicates that protocol configuration is incorrect after signals are transmitted from the router to the ETMX board.

The preceding information shows that the problem is due to incorrect configurations of the ETMX board.