Description of the problem

Huawei SDH transmission equipment-N3SL16 single board-N1SXCSA crossover-N3SL16 single board-Fiber-N3SL16 single board-SXCSA crossover-N4SL64 single board

As shown in the above figure of simple networking, Peru SSN1SL64 single board, in the configuration of the service, the remote end of the hanging meter test, this end of the SSN1SL64 optical port pigtail loopback, to the table above no alarm, business is normal; but the SSN1SL64 single board software optical port loopback or VC4 channel loopback, the meter above the AIS, business is not available; and then the However, when the SSN1SL64 board is used for software optical port loopback or VC4 channel loopback, AIS is reported on the meter and the service is not available.

The host version is 5.21.16.13 and the N1SL64 board version is 413.

Alarm message

AIS alarm is reported on the meter, no alarm on the device.

Processing

In the lab, using the same R6 version of SSN1SL64 board as in the current network, the reproduction is done in the form of "Instrument <--?SL16 board <--?SSN1SL64 board loopback", and the SSN1SL64 board uses the 4.13 version of SSN1SL64 board to report AIS alarms. Cross <-?SSN1SL64 board loopback", SSN1SL64 board using version 4.13 instrument reported AU_AIS, using version 4.16 for verification, the service is normal, after analyzing, for the software version of the problem.

Root Cause

For SSN1SF64, SSN1SL64, SSN1SLQ16 single boards using SD8501 chip, in the case of R_LOS, the software will force the MS_AIS to be inserted downstream, and when testing with soft loopback, it is found that the R_LOS alarm exists all the time, and although the loopback is looped back within the service, but the MS_AIS forced by the software is still valid, which results in the downstream reporting AU_AIS and the meter reporting AU_AIS. AIS, and the meter reported AU_AIS.

Suggestion and Summary

Root Cause Measures

1, if the single-board software is R7 supporting version, upgrade the single-board software to R007C02B017SP01 supporting version or R007C02B018 (excluding the version) after the supporting version can solve the problem.

2, if the single-board software is R6 supporting version, upgrade the single-board software to R6C02B014 supporting version or after the supporting version can solve the problem, single-board software version 4.16.

3, if the single-board software is R2/R4/R5/R8C01 supporting version, you need to upgrade the single-board software to other R version of the matching version has been modified to solve this problem.

4, if the single board software is R3C02 supporting version, R3C02B060 (excluding this version) after the supporting version will solve this problem;

If the single board software is R8C02 supporting version, R008C02B01j (5.XX.18.47) (excluding this version) after the supporting version will soon solve this problem.

Scope of the problem

Problematic veneers.

Huawei SDH transmission OSN3500 device SSN1SL64/SSN1SF64/SSN1SLQ16

Problematic version:

All versions prior to NGSDH V100R006C02B014 (5.XX.16.14) (excluding this version);

All versions prior to NGSDH V100R007C02B017SP01 (5.XX.17.31P01) (excluding this version);

NGSDH V100R007C02B018 (5.XX.17.31) versions;

All versions of NGSDH V100R008C01;

All versions up to and including NGSDH V100R008C02B01j (5.XX.18.47);

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