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Reconstructing the OptiX Metro 100 SNCP ring fails

Publication Date:  2012-07-24 Views:  159 Downloads:  0

Issue Description

Reconstruction needs to be performed for a complicated network by a representative office. The network topology is as follows:
Metro 100 non-protection chain <----> OSN 2500 SNCP ring <----> OSN 3500 SNCP ring
One day, the customer changed the OptiX Metro 100 non-protection chain to a ring and configured the ring for SNCP. The services from the Metro 100 to the backbone OptiX OSN 3500 ring were required to be protected.
The operation is as follows:

1) Select the trail in the Trail Management view. Choose Maintenance > Modify Timeslot.
2) The Trail Modify view is displayed. Select SNCP Setting (by default, it is Trial Setting).
3) Select Delete Protection. Delete the protection SNC configurations of the trail on the OptiX OSN 2500 SNCP ring and the OptiX OSN 3500 SNCP ring respectively.
4) Configure the OptiX Metro 100 as the source node to transmit two signals, and the OptiX OSN 3500 as the sink node to select one of the two signals in the SNCP. Click OK. An error message is returned prompting "Illegal time slot." The error code is 38768. See the attachment.  

Alarm Information

38768: Illegal lower order channel number
NE software version: 5.42.1 

Handling Process

In Step 4, select Set Timeslot Route and modify the parameter to ensure that the consistency of the timeslots in the active and standby paths on the OptiX Metro 100 ring. The node creation operation is successful.       

Root Cause

According to the logs on the T2000, it is found that the following NE is faulty:
NE ID: 9-143 Metro 100
NE name: ss11307a_100
By analyzing the service configuration on the T2000, it is found that the services in the standby path are different from those in the existing active path of the OptiX Metro 100. The active path is VC-4 1-1-2, and the standby path is VC-4 1-1-3. The OptiX Metro 100 does not support such lower order time division configuration.
Why is there the inconsistency? Analysis shows that VC-4 1-1-2 in the standby path on the OptiX OSN 2500 ring is occupied by another path. To ensure the consistency of the timeslots in the standby path, the T2000 automatically chooses the next VC-12 timeslot.