Juniper ERX - RELEASE 11.1.X HARDWARE GUIDE 03-23-2010 Hardware Manual page 113

For example, an OCx/STMx line module can pair with either an OC3-4 or an
OC12/STM4 I/O module. Consequently, the line module has four port status LEDs
for OC3/STM1 operation. However, only the top set of port status LEDs is active
during OC12/STM4 operation.
Table 10 on page 97 presents the functions of the module LEDs and port status LEDs.
Table 10: LED Identification and Activity Descriptions
LED
Location LED Label
All OK
modules
FAIL
ONLINE
All REDUNDANT
modules
SRP POWER A OK
module
POWER B OK
FAN OK
FAN FAIL
LINK
ACTIVITY
Ethernet LINK
line
modules
ACTIVITY
LED Indicator LED Color
Module status Green
Module status Red
Module status Green
Redundancy Green
NOTE: The REDUNDANT LED on the cOCx/STMx, FE-8, GE/FE, HSSI, OCx/STMx, and X.21/V.35
line modules is nonfunctional.
Power Green
Power Green
Fan Green
Fan Red
NOTE: When the LED alternates between OK and FAIL at 10-second intervals, a noncritical fan
failure exists.
Ethernet Green
Ethernet Green
Ethernet Green
Ethernet Green
OFF to ON
Self-test passed
Failure detected
Module online
See "Redundancy Status" on page 103.
Power online on source A
Power online on source B
Fan online
Critical fan failure
Ethernet link up
Blinks when Ethernet traffic
on link
Ethernet link up
Blinks when Ethernet traffic
on link
Understanding Status LEDs to Troubleshoot
Chapter 9: Troubleshooting
ON to OFF
Failure detected
Diagnostic test running
Module offline
Power off
Power off
Critical fan failure
Fan online
Ethernet link down
No Ethernet traffic on link
Ethernet link down
No Ethernet traffic on link
97