Juniper Networks J-Series manual Chassis Alarm Conditions and Corrective Actions

J-series™ Services Router Administration Guide

Table 89: Interface Alarm Conditions (continued)

Interface	Alarm Condition
T3 (DS3)	Alarm indication signal

Excessive number of zeros

Far-end receive failure

Idle alarm

Line code violation

Loss of frame

Loss of signal

Phase-locked loop out of lock

Yellow alarm

Description	Configuration
	Option
The normal T3 traffic signal contained a defect	ais
condition and has been replaced by the AIS. A
transmission interruption occurred at the remote
endpoint or upstream of the remote endpoint. This
all-ones signal is transmitted to prevent
consequential downstream failures or alarms.
The bit stream received from the upstream host has	exz
more consecutive zeros than are allowed in a T3
frame.
The remote endpoint of the connection has failed.	ferf
A FERF differs from a yellow alarm, because the
failure can be any failure, not just an out-of-frame
(OOF) or loss-of-signal (LOS) failure.
The Idle signal is being received from the remote	idle
endpoint.
Either the line encoding along the T3 link is	lcv
corrupted, or a mismatch between the encoding at
the local and remote endpoints of a T3 connection
occurred.
An out-of-frame (OOF) or loss-of-signal (LOS)	lof
condition has existed for 10 seconds. The
loss-of-frame (LOF) failure is cleared when no OOF
or LOS defects have occurred for 20 seconds. A LOF
failure is also called a red failure.
No remote T3 signal is being received at the T3	los
interface.
The clocking signals for the local and remote	pll
endpoints no longer operate in lock-step.
The remote endpoint is in red alarm failure. This	ylw
condition is also known as a far end alarm failure.

Chassis Alarm Conditions and Corrective Actions

Table 90 on page 171 lists chassis components with preset alarms, the conditions that can trigger an alarm, the alarm severity, and the action you take to correct the condition.

170■ Alarm Overview