Juniper Networks J-Series manual Interface Alarm Conditions

J-series™ Services Router Administration Guide

Table 89: Interface Alarm Conditions

Interface	Alarm Condition	Description	Configuration
			Option
DS1 (T1)	Alarm indication signal	The normal T1 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		condition and has been replaced by the AIS.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.
	Yellow alarm	The remote endpoint is in red alarm failure. This	ylw
		condition is also known as a far end alarm failure.
Ethernet	Link is down	The physical link is unavailable.	link-down
Integrated	Hardware or software failure	On the adaptive services module, either the	failure
services		hardware associated with the module, or the
		software that drives the module, has failed.
Serial	Clear-to-Send signal absent	The remote endpoint of the serial link is not	cts-absent
		transmitting a CTS signal. The CTS signal must be
		present before data can be transmitted across a
		serial link.
	Data Carrier Detect signal	The remote endpoint of the serial link is not	dcd-absent
	absent	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.
	Data Set Ready signal absent	The remote endpoint of the serial link is not	dsr-absent
		transmitting a DSR signal. The DSR signal indicates
		that the remote endpoint is ready to receive and
		transmit data across the serial link.
	Loss of receive clock	The clock signal from the remote endpoint is not	loss-of-rx-clock
		present. Serial connections require clock signals to
		be transmitted from one endpoint and received by
		the other endpoint of the link.
	Loss of transmit clock	The local clock signal is not present. Serial	loss-of-tx-clock
		connections require clock signals to be transmitted
		from one endpoint and received by the other
		endpoint of the link.

168■ Alarm Overview