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Timeslot Collision Occurs When Service Is Created

Publication Date:  2012-07-24 Views:  53 Downloads:  0
Issue Description

Create VC-12 services 1�15 one after another in the STM-1 frame. Then, create a VC-3 service in the second VC-3 of the STM-1 frame. It is found that an alarm is generated to report the timeslot collision. 

 

Alarm Information

Null

Handling Process

1.Right-click the NE on the T2000 and select Configuration.
2.According to the service configuration and engineering planning, click Option and select ITU-T or Interleaved as the VC-12 timeslot numbering scheme.
3.Create the services according to the selected VC-12 timeslot numbering scheme. 
 

Root Cause
The sequential mode (ITU-T) is used as the VC-12 timeslot numbering scheme. Hence, the 15 VC-12 services occupy the second VC-3. Then, timeslot collision is reported when you create the VC-3 service in the second VC-3. 
            
Suggestions

When you create a VC-12/VC-3 service on the T2000, configure the service according to the selected VC-12 timeslot numbering scheme. The following VC-12 timeslot numbering schemes are available:
1.Sequential mode (ITU-T): The VC-12 timeslots that are numbered 1, 4, 7, 10, and so on belong to the first VC-3, the VC-12 timeslots that are numbered 2, 5, 8, 11, and so on belong to the second VC-3, and so on.
2.Interleaved mode: The VC-12 timeslots numbered 1�21 belong to the first VC-3, and the VC-12 timeslots numbered 22�43 belong to the second VC-3, and so on. 
 

END