Juniper J-Series Administration Manual page 190

J-series Services Router Administration Guide
Table 89: Interface Alarm Conditions
Interface Alarm Condition
DS1 (T1) Alarm indication signal
Yellow alarm
Ethernet Link is down
Integrated Hardware or software failure
services
Serial Clear-to-Send signal absent
Data Carrier Detect signal
absent
Data Set Ready signal absent
Loss of receive clock
Loss of transmit clock
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Alarm Overview
Description
The normal T1 traffic signal contained a defect
condition and has been replaced by the AIS.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 remote endpoint is in red alarm failure. This
condition is also known as a far end alarm failure.
The physical link is unavailable.
On the adaptive services module, either the
hardware associated with the module, or the
software that drives the module, has failed.
The remote endpoint of the serial link is not
transmitting a CTS signal. The CTS signal must be
present before data can be transmitted across a
serial link.
The remote endpoint of the serial link is not
transmitting a DCD signal. Because the DCD signal
transmits the state of the router, no signal probably
indicates that the remote endpoint of the serial link
is unavailable.
The remote endpoint of the serial link is not
transmitting a DSR signal. The DSR signal indicates
that the remote endpoint is ready to receive and
transmit data across the serial link.
The clock signal from the remote endpoint is not
present. Serial connections require clock signals to
be transmitted from one endpoint and received by
the other endpoint of the link.
The local clock signal is not present. Serial
connections require clock signals to be transmitted
from one endpoint and received by the other
endpoint of the link.
Configuration
Option
ais
ylw
link-down
failure
cts-absent
dcd-absent
dsr-absent
loss-of-rx-clock
loss-of-tx-clock