Description of the problem

Huawei OSN3500 equipment SNCP networking, the main ring is configured with SL64 single board, the host software is 5.21.13.47P02, the cross-board is configured with GXCSA. The host software is 5.21.13.47P02, and the cross-board is configured with GXCSA. users report that a large number of regeneration and multiplexing segment errors are reported on the SL64 board at station B receiving station A, and at the same time, regeneration and multiplexing segment errors are reported on the SL64 board at station A receiving station B. The user reports that a large number of regeneration and multiplexing segment errors are reported at station B receiving station B, and at the same time, station A receives regeneration and multiplexing segment errors.

Alarm Information

A large number of regeneration and multiplexing segment errors have been reported on the SL64 board at station B receiving station A, while a large number of pairs of alarms have been reported at the opposite end.

Processing

1, because the B station reported BER A station reported the pair of reports, confirmed that the problem is a single direction to receive the BER, through the network management performance view and on-site testing, the B station to receive the A station optical power -12.7, is the normal range, to rule out the collection of light too weak reasons.

2, the user test fiber optic cable and the optical cable between the A-B site for transceiver alignment, the failure phenomenon does not transfer with the cable alignment, indicating that the failure is still on the equipment side.

3, due to the configuration of the GXCSA single board, so ruled out and line board with the problem caused by the error code.

4, the user replaced the SL64 optical board of station A and B, the fault still does not disappear, but can be ruled out optical board failure.

5, carefully study the user network, found that the distance between A-B has 100KM, and is 10G rate, the user configuration is the optical board + BA -----PA + DCU + optical board.

6, taking into account the DCU single board is just a piece of dispersion compensation fiber, the failure rate is relatively small, so focus on the BA and PA module for troubleshooting, but no anomalies were found.

6, each site for loopback test, because the DCU is a dispersion compensation module, not suitable for loopback, so the DCU removed into the PA + optical board, is ready to loopback, the network management call feedback from tens of thousands of BER changed to 1, 2.

7, the judgment is DCU failure, replace the DCU failure disappears.

Root cause

1, the quality of fiber optic cable, optical path failure.

2、Optical board failure.

3、Other

Suggestions and Summary

Huawei OSN3500 equipment DCU single board, although it is a section of dispersion supplemental fiber, but there is also the possibility of failure, judging the failure should be careful, can not be taken for granted, and must not let go of any link.

The relevant technical information in this chapter and the SDH equipment troubleshooting process is collected and organized by Shenzhen Optical Transmission Network Technology Company Limited ( www.opticaltrans.com), reproduced and retained! Our company specializes in Huawei SDH optical transmission equipment, SDH transmission equipment sales.