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APPENDIX B
Module LEDs
LED Identification
Table 18: LED Identification and Activity Descriptions
LED
Location
LED Label
All
OK
modules
FAIL
ONLINE
Copyright © 2010, Juniper Networks, Inc.
This appendix describes the LEDs found on ERX modules. Module LEDs can show you
the current status of a module and alert you to a problem with the module or one of its
ports. We recommend that you familiarize yourself with LED activity so that you can
easily detect and correct a module-related problem with minimal or no system downtime.
This appendix contains the following sections:
LED Identification on page 109
Redundancy Status on page 113
The system's modules have two sets of status LEDs. The top set indicates overall router
and module status. The bottom set indicates module-specific status, such as port status
(line modules) or fan status (SRP module).
The number next to the port status LED on a line module corresponds to the number of
the port on the I/O module. Some line modules have more port status LEDs than the
number of ports on the I/O module. In these cases, only the LEDs for the corresponding
ports on the I/O modules are active.
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 18 on page 109 lists the functions of the module and port status LEDs.
LED Indicator
LED Color
Module status
Green
Module status
Red
Module status
Green
OFF to ON
Self-test passed
Failure detected
Module online
ON to OFF
Failure detected
Diagnostic test running
Module offine
109
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