Juniper Networks 8 manual 107

Troubleshooting

Table 11: LED Identification and Activity Descriptions (continued)

LED Location	LED Label	LED Indicator	LED Color	OFF to ON	ON to OFF
X.21/V.35 line	ACTIVE	Port status	Green	Port configured	Port not
module					configured
	LOOPBK	Port status	Yellow	Port in local	Port not in
				loopback or	loopback
				remote loopback,
				depending on
				the type of
				connection.
	ERROR	Port status	Red	Port is enabled or	Port is disabled or
				comes online	goes offline
	V.35	Port status	Green	V.35 cable	V.35 cable
				connected	disconnected
	X.21	Port status	Green	X.21 cable	X.21 cable
				connected	disconnected
	DCE	Port status	Green	DCE cable	DCE cable
				connected	disconnected
	DTE	Port status	Green	DTE cable	DTE cable
				connected	disconnected
Other line	SYNC	Port status	Green	In frame	Not in frame
modules
	YEL ALM	Port status	Yellow	Far-end receive	No FERF present
				failure (FERF)
				exists
	RED ALM	Port status	Red	Loss of sync/frame	In frame

The following figures show a representative module for each of the three variations:

SRP module (Figure 47)

Ethernet line module (Figure 48)

Other line modules (Figure 49)

Understanding Status LEDs to Troubleshoot 107