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MS_APS_INDI_EX and APS_INDI alarms were observed continuously

Publication Date:  2012-07-24 Views:  32 Downloads:  0
Issue Description
MS_APS_INDI_EX and APS_INDI alarms were observing continuously. After the customer's complaint, i checked the parameters and configuration in detail. There was a Linear MS made on which alarm occured. 
Alarm Information
MS_APS_INDI_EX, APS_INDI
Handling Process
I simply changed the option from Non-Revertive to Revertive and also from Single-Ended to Dual-Ended so that if in future the problem occurs at any end, it simply switch itself accordingly.
Root Cause
I checked the configuration in detail and the cause was found. Linear MS was made and Non-Revertive option was selected. Due to this, after the degradation, the switching occured and was not reverted to the orignal. 
Suggestions
If such problem occurs, check the following
1) Revertive or Non-Revertive
2) Parameters of alarms (first parameter shows the protection scheme,  Linear MS or Ring MS)

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