Juniper E Series Hardware Manual page 119

Table 11: LED Identification and Activity Descriptions (continued)
LED Location LED Label
X.21/V.35 line ACTIVE
module
LOOPBK
ERROR
V.35
X.21
DCE
DTE
Other line SYNC
modules
YEL ALM
RED ALM
The following figures show a representative module for each of the three variations:
LED Indicator
Port status
Port status
Port status
Port status
Port status
Port status
Port status
Port status
Port status
Port status
SRP module (Figure 50)
Ethernet line module (Figure 51)
Other line modules (Figure 52)
LED Color OFF to ON
Green Port configured
Yellow Port in local
loopback or
remote loopback,
depending on
the type of
connection.
Red Port is enabled or
comes online
Green
V.35 cable
connected
Green X.21 cable
connected
Green
DCE cable
connected
Green
DTE cable
connected
Green In frame
Yellow Far-end receive
failure (FERF)
exists
Red Loss of sync/frame
Understanding Status LEDs to Troubleshoot
Troubleshooting
ON to OFF
Port not
configured
Port not in
loopback
Port is disabled or
goes offline
V.35 cable
disconnected
X.21 cable
disconnected
DCE cable
disconnected
DTE cable
disconnected
Not in frame
No FERF present
In frame
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