Inconsistent APS Codes

Description

In bidirectional line-switched rings (BLSRs), there is a rolling window of 12 frames in which 3 consecutive frames must have identical K-bytes. If this requirement is violated, an inconsistent APS codes alarm is generated.

Alarm Data

Value/Meaning

Severity Levels

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

Default: Major (MJ)

ASAP Type

BLSR Protection Group

AID Type

OC-48 line

OC-192 line

Date

Month/day/year that the condition was detected

Time

Hour:minute:second that the condition was detected

Probable Cause

APSC (APS codes inconsistent)

Effect on Service

NSA

Alarm Entity Type

OC48

OC192

Description

Inconsistent APS Codes

Likely Cause

A node in the BLSR is isolated due to

  • A fiber cut

  • An OC-48/OC-192 OLIU circuit pack failure

  • A SYSCTL circuit pack failure, reset, or initialization

  • An inc. OC-48/OC-192 sig. degrade alarm at some point on the BLSR.

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 5-82: Clear "Inconsistent APS Codes" alarm.

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