The system has detected a loss-of-frame (LOF) condition in an incoming STM-N signal. LOF is declared when an out-of-frame (OOF) condition persists for a period of 3 milliseconds.
|
Alarm Data |
Value/Meaning |
|---|---|
|
Severity Levels |
Critical (CR), Minor (MN) SA: Critical (CR) NSA: Minor (MN) |
|
AID Type |
STMN Line |
|
Date |
Month/day/year that condition was detected |
|
Time |
Hour:minute:second that condition was detected |
|
Probable Cause |
LOF (Loss of Frame) |
|
Effect on Service |
SA or NSA |
|
Alarm Entity Type |
STM1 STM4 STM16 |
|
Description |
inc. STM1 LOF inc. STM4 LOF inc. STM16 LOF |
|
Likely Cause |
The interfacing STMN terminal equipment failed or there is incorrect STMN port provisioning at either the interfacing STMN terminal equipment or the local network element. An unprotected line/port carrying service failed: SA. A protected line/port failed: NSA. |
|
Visible Indication |
Lighted CR/MJ or MN/ABN LED on SYSCTL faceplate and a flashing FAULT LED on the alarmed circuit pack. |
|
Action |
Proceed to Procedure 5-36: Clear "inc. OCN/STMN" conditions/alarms. |
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