There is a mismatch detected in the primary section of the APS channel, specifically K2 byte, bits 1–4. Therefore, the near-end and far-end network elements of a 1+1_OPTM protection switching span do not agree on the primary section. The APS channel is provided by the K1 and the K2 bytes in the SONET section overhead of an STS-N to communicate the protection switching protocol between the local and far-end nodes.
|
Alarm Data |
Value/Meaning |
|---|---|
|
Severity Levels |
Critical (CR), Major (MJ), Minor (MN), Not Alarmed (NA), Not Reported (NR) Default: Major (MJ) |
|
ASAP Type |
1+1 Optimized Protection Group |
|
AID Type |
OC-N line (1+1 optimized protection group) |
|
Date |
Month/day/year that the condition was detected |
|
Time |
Hour:minute:second that the condition was detected |
|
Probable Cause |
APSPSM (APS Primary Section Mismatch) |
|
Effect on Service |
NSA |
|
Alarm Entity Type |
OCN |
|
Description |
Automatic protection primary section mismatch |
|
Likely Cause |
User selected Fault → Protection Switch and highlighted 1+1_OPTM Line Protection Group, and provisioned the Switch Type as Lockout. |
|
Visible Indication |
Lighted CR, MJ, or MN LED on the SYSCTL faceplate (when the severity level is provisioned to Critical, Major, or Minor, respectively) |
|
Action |
Proceed to Procedure 5-8: Clear "Automatic protection switch primary section mismatch" alarm. |
| November 2011 | Copyright © 2011 Alcatel-Lucent. All rights reserved. |