Problem Description
After the EMS4 and EGS4 single boards of the NG-SDH equipment are configured with BPS and PPS, do the GE optical ports of the standby single board glow?
Alarm information
None
Processing
After the GE port of the EGS4 and EMS4 single boards is configured with BPS and PPS protection, if the GE optical port of the main board operates in the 1000MFULL mode, the standby board's optical port 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 the 1000MFULL mode emits light.
Root Cause
After the EGS4 and EMS4 single boards of the NG-SDH equipment 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 its single board.
1, GE optical port in 1000MFULL mode spare optical port is not light, when the master and backup reversed spare port only light, so that the spare port of the opposite end of the data equipment from the LINKDOWN state to the LINKUP 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 1000MFULL mode so that the peer data device is in LINKDOWN state after unsuccessful negotiation.
BPS, PPS protection design idea is through the physical port state of the single board so that the end of the data equipment primary channel LINKUP, standby channel LINKDOWN.
Suggestions and conclusions
In-depth study of the principle of BPS, PPS protection, for the design idea and the protection characteristics should be mastered.