Problem at SDH trail Agra slot 8 port 2 vc4-3, to Meerut slot 8 port 2 vc4 -3.The problem came only oneVC4 (VC4-3) and other trails working in same route. After deleting the trail on the VC4:3 we made the trail on VC4:8 and the traffic was shifted on that and trail got up.
AUAIS alarm would appear at the traditional trail
To avoid such a situation in the future, need to follow the below procedure when downgrading the ASON Services.
1.Go to SDH ASON trail management and select the specific trail which has to be downgraded:
2.Now right click on the trail and go the Downgrade to Traditional Service option.
3.If the ASON trail is managed by SDH trail then an error message will pop up.
4.Again right click on the specific ASON trail and click on the option Query Relevant trails.
5.Now the window for SDH trail management will pop up. Right click on the relevant trail and click on downgrade to traditional service.
6.The window for Downgrade to Traditional Service will pop up. Click on the Add option.
7.After that click on the OK option.
8.After that the ASON trail will get downgraded to Traditional Service.
In this particular case, VC4 trail that was down is not added to the downgrade to traditional service Window. Need to follow the correct procedure.
There were 12 Inter Msc trails between Agra and Merrut and they were downgraded to traditional SDH with SNCP. However that day only one particular VC4 went down i.e. between Agra slot 8 port 2 vc4-3, to Meerut slot 8 port 2 vc4 -3.
After analysis it was found that the out of 12 downgraded sdh trails only that particular one is UNIDIRECTIONAL while the rest are BIDIRECTIONAL.
This is the procedural mistake happen while downgrading the ASON trails.
Need to follow the attached procedure.