The near-end network element received unexpected switching request codes in the APS channel (specifically, K1 byte, bits 1–4) in the protection switching request for a 1+1_OPTM protection group. 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 |
APSUC (APS unused codes) |
|
Effect on Service |
NSA |
|
Alarm Entity Type |
OCN |
|
Description |
Automatic protection unused codes |
|
Likely Cause |
The OC-N line at the near-end network element has been provisioned to 1+1_OPTM, but the OC-N line at the far-end network element has been provisioned to an incompatible protection group type. |
|
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 5-9: Clear "Automatic protection switch unused codes" alarm. |
| November 2011 | Copyright © 2011 Alcatel-Lucent. All rights reserved. |