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Problem Description
A customer 's OSN3500 equipment SNCP networking, the main ring is configured with SL64 single board, host software is 5.21.13.47P02, cross board configuration is 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 the regeneration and multiplexing segment errors are reported on the SL64 board at station B.
Alarm messageStation B receives a large number of regeneration segment and multiplexing segment error codes from SL64 single board of station A, and at the same time, there are a large number of pairs of alarms at the opposite end.
Processing1, because the B station reported the error code A station reported the pair of reports, confirmed that the problem is a single direction to receive the error code, through the performance of the network management to view and test the site, the B station to receive the A station optical power -12.7, is the normal range, to rule out the receipt of light is too weak reasons.
2, the user test fiber optic cable and the optical cable between the A-B site for sending and receiving alignment, the failure phenomenon does not transfer with the fiber optic cable alignment, indicating that the failure is still on the equipment side.
3, due to the configuration of the GXCSA single board, so exclude and line board with the problem caused by the error code.
4, the user replaced the SL64 optical board at stations A and B, the fault still does not disappear, but can rule out the optical board failure.
5, carefully study the user network, found that the distance between A-B is 100KM, and 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 to carry out troubleshooting, but no anomalies were found.
6, the loopback test for each site, because the DCU is a dispersion compensated module, is not suitable for loopback, so the DCU will be removed into the PA + optical board, is ready to loopback, the network management call feedback from tens of thousands of BER to 1, 2.
7, the judgment is DCU failure, replace the DCU failure disappears.
2, the user test fiber optic cable and the optical cable between the A-B site for sending and receiving alignment, the failure phenomenon does not transfer with the fiber optic cable alignment, indicating that the failure is still on the equipment side.
3, due to the configuration of the GXCSA single board, so exclude and line board with the problem caused by the error code.
4, the user replaced the SL64 optical board at stations A and B, the fault still does not disappear, but can rule out the optical board failure.
5, carefully study the user network, found that the distance between A-B is 100KM, and 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 to carry out troubleshooting, but no anomalies were found.
6, the loopback test for each site, because the DCU is a dispersion compensated module, is not suitable for loopback, so the DCU will be removed into the PA + optical board, is ready to loopback, the network management call feedback from tens of thousands of BER to 1, 2.
7, the judgment is DCU failure, replace the DCU failure disappears.
Root Cause1, the quality of fiber optic cable, optical path failure.
2、Optical board failure.
3、Others
2、Optical board failure.
3、Others
Suggestions and SummaryAlthough the DCU veneer is a piece of dispersion supplemented fiber, but there is also the possibility of failure, judge the failure to be careful, can not be taken for granted, must not let go of any link.
END
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