Severity Levels

Critical (CR), Major (MJ), Minor (MN), Not Alarmed (NA), Not Reported (NR)

Unprotected default: Major (MJ)

Protected default: Minor (MN)

ASAP Type

System Timing

AID Type

Synch reference (external)

Date

Month/day/year that the condition was detected

Time

Hour:minute:second that the condition was detected

Probable Cause

SYNCOOS (Loss of timing on both primary and secondary synchronization references)

SYNC (Loss of timing on a protected synchronization reference)

Effect on Service

NSA

Alarm Entity Type

T1

Description

inc. DS1 sync. ref. LOS

Likely Cause

Failure of the timing supply that provides the DS1 timing reference.

The system is turned-up with default conditions and no incoming external timing input signal is present.

Visible Indication

Lighted CR, MJ, or MN LED on the SYSCTL faceplate (when the severity level is provisioned to Critical, Major, or Minor, respectively) and a flashing Fault LED on the alarmed circuit pack.

Action

Proceed to Procedure 5-49: Clear "inc. DS1/E1 sync. ref." alarms.