Juniper Networks 8 manual 106

ERX 8.0.x Hardware Guide

Table 11: LED Identification and Activity Descriptions (continued)

LED Location	LED Label	LED Indicator	LED Color	OFF to ON	ON to OFF
Ethernet line	LINK	Ethernet	Green	Ethernet link up	Ethernet link
modules					down
	ACTIVITY	Ethernet	Green	Blinks when	No Ethernet traffic
				Ethernet traffic	on link
				on link
HSSI line module	SYNC	Port status	Green	If the port is	If the port is
				configured as	configured as DTE,
				DTE, the LED	the LED goes out
				lights when both	when either the
				the DCE and the	DCE or the clock
				clock source are	source becomes
				available.	unavailable.
				If the port is	If the port is
				configured as	configured as
				DCE, the LED	DCE, the LED
				lights when the	goes out when
				DTE is available.	the DTE becomes
					unavailable.
	YEL ALM	NOTE: This LED is not functional on the HSSI line module.
	RED ALM	Port status	Red	If the port is	If the port is
				configured as DTE,	configured as
				the LED lights	DTE, the LED goes
				when either the	out when both
				DCE or the clock	the DCE and the
				source becomes	clock source are
				unavailable.	available.
				If the port is	If the port is
				configured as	configured as
				DCE, the LED	DCE, the LED goes
				lights when the	out when the DTE
				DTE becomes	is available.
				unavailable.

106 Understanding Status LEDs to Troubleshoot