Severity Levels

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

Default: Not Alarmed (NA)

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

E1

Description

inc. E1 sync. ref. CRC-4 MFA mismatch

Likely Cause

The E1 timing input port is provisioned to receive a CRC-4 formatted E1 synchronization reference signal and the incoming E1 synchronization reference signal is a non-CRC-4 formatted E1 signal.

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.