Description of the problem

After the Huawei SDH equipment OSN3500 EMS4,EGS4 single boards are configured with BPS and PPS, do the GE optical ports of the standby single boards emit light?

Processing

After BPS and PPS protection is configured on the GE ports of the SSN4EGS4 and SSN1EMS4 single boards of Huawei OSN3500 equipment, if the GE ports of the main board are working in the 1000M FULL mode, the standby board does not emit light. If the main board GE optical port is configured in AUTO mode, the standby board GE optical port actually works in 1000M FULL mode to glow.

Root Cause

After Huawei NG-SDH equipment N4EGS4 and N1EMS4 boards are configured with BPS and PPS protection, whether or not the GE optical port of the standby board emits light depends on the working mode configured on the board.

1, OSN3500 GE optical port in the 1000M FULL mode spare optical port is not light, when the master and the backup reversed spare port only light, so that the spare port of the opposite end of the data equipment from the LINK DOWN state to the LINK UP state.

2. When the GE optical port is in AUTO mode, the port of the peer data device is also in AUTO mode. Then the GE optical port on the backup board actually emits light in 1000M FULL mode so that the data device on the other end will be in LINK DOWN state if the negotiation is unsuccessful.

The design idea of BPS and PPS protection is to make the primary channel of the peer data device LINK UP and the backup channel LINK DOWN through the state of the physical port of the single board.

Suggestions and Summary

In-depth study of the BPS, PPS protection principle, the design ideas and protection features to master.

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