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Service configured between SNCP ring and multi-section protection ring is down due to two fiber cuts in multi-section protection ring and one fiber cut in SNCP ring

Publication Date:  2019-07-03 Views:  110 Downloads:  0

Issue Description

Services are configured from 107-Metpali to 32-Mancherial are down when there is fiber-cut between 30-Nizamabad to 31-Jagital, 31-Jagital to 107-Metpali and 32-Mancherial to 31-Jagital  respectively during the same time.

Alarm Information

R-LOS on corresponding ports and the service is affected.

Handling Process

Ensure that the services which are configured are on the same timeslots, on the entire Protection Subnet.

Root Cause

When the cross-connections are checked on the corresponding NEs which participate in both the rings. i.e. 30-Nizamabad and 31-Jagital, the VC4 on which the services are dropped are on different time slots. As in this case the cross-connections on 31-Jagital are from 8-N1SL64-1(SDH-1)  VC4:30  -  11-N1SL64-1(SDH-1)  VC4:1 which 

Suggestions

 When there is a network with the SNCP as well as multi-section protection Ring sharing, the services must be configured in same time slots. 

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