Juniper E Series Hardware Manual page 118

ERX 7.0.x Hardware Guide
Table 11: LED Identification and Activity Descriptions (continued)
LED Location LED Label
LINK
Ethernet line
modules
ACTIVITY
HSSI line module SYNC
YEL ALM
RED ALM
102
Understanding Status LEDs to Troubleshoot
LED Indicator LED Color
Ethernet Green
Green
Ethernet
Port status
Green
NOTE: This LED is not functional on the HSSI line module.
Port status
Red
OFF to ON ON to OFF
Ethernet link up Ethernet link
down
Blinks when No Ethernet traffic
Ethernet traffic
on link
on link
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.
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.