Description of the problem

1. A and E open official telephones, A is OSN3500, B is Huawei OTN, C is OSN3500, D is SDH equipment from a friend, and E is OSN3500, and the network is organized as shown in the figure below.

2. After the business configuration is completed, it is found that the official phone does not work and there is no alarm on the network management.

Processing

1. First check the official telephone configuration and confirm that there is no problem.

2. In accordance with the business direction, check the existing network, there is no line attenuation or interruption.

4、Troubleshooting the phone or phone line failure, after checking that there is no problem

3, A and C to open the official telephone for testing, can be used normally, to rule out A, B, C problems

4、Customer feedback, E device has no other business, you can jump off the D device through the fiber. After jumping off the friendly equipment, A and E open the official telephone service, can be used normally. Users are asked to check the problems of the equipment of Friends, after investigation, Friends only cross-connect, not to E1/E2 byte transmission, resulting in failure, after Friends engineers to deal with the restoration.

Root Cause

No E1/E2 byte passthrough from friendly devices

Solution

OSN3500 does not need to deal with it, and the friend deal with it (transmitting the E1/E2 bytes)

The related technical information in this chapter and the troubleshooting process of SDH equipment are collected and organized by Shenzhen Optical Transmission Network Technology Company Limited (www.opticaltrans.com), please retain the reproduction! Our company specializes in the sales of Huawei SDH optical transmission equipment,SDH transmission equipment.