ADC Release 3.1 User Manual

Page 477

1152700

•

Issue 1

•

February 2001

•

Section 2 Operations and Maintenance

Page 2-433

TAP-100

Page 14 of 23

Table 4-1. Alarm Identifications, continued

ALARM
MESSAGE

SEVERITY

IMPACT

DESCRIPTION

SUGGESTED COURSE OF ACTION

Physical
Layer
Convergen
ce Protocol
Loss of
Frame

PLCP-Lof

Critical

Service
Affecting

PLCP encoding problem at
the far end, or line
degradation.

Check far end encoding and
line levels.

Physical
Layer
Convergen
ce Protocol
Severely
Errored
Framing
Seconds
Threshold
Crossing
Alert

PLCP-
SEFSTca

Information
al Alert

Service
Degradation

PLCP severely errored
frame seconds threshold
crossing alert.

The TCAs signal a problem
with the integrity of the PLCP
overhead in the DS3 frame.
The most probable cause is a
mismatch between the
transmitter and the receiver.
Examine the physical circuit to
determine

if there are any

impairments.

Physical
Layer
Convergen
ce Protocol
Unavailabl
e Seconds
Threshold
Crossing
Alert

PLCP-
UASTca

Information
al Alert

Service
Degradation

PLCP unavailable seconds
threshold crossing alert.

An error rate of 1.6E-5 or
worse for a period of time
more than ten seconds.
Examine the physical circuit to
determine

if there are any

impairments.

Physical
Layer
Convergen
ce Protocol
Yellow
Alarm

PLCP-
YellowAlar
m

Minor

Installation
Error

PLCP yellow alarm.
Remote end has detected a
PLCP Loss of Frame
(LOF).

PLCP Yellow alarm indicates
to the near end a problem with
the framing in the PLCP
header at the far end.Examine
the physical circuit to
determine

if there are any

impairments.

(continued)