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

LOS (Loss of Signal)

Effect on Service

SA or NSA

Alarm Entity Type

STM1

STM4

STM16

Description

inc. STM1 LOS

inc. STM4 LOS

inc. STM16 LOS

Likely Cause

The STMN OLIU circuit pack/pluggable transmission module failed at the near end, the receive fiber failed, or the OLIU circuit pack failed at the far end.

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.