APPENDIX B
Module LEDs
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
LED Identification
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.
Table 18: LED Identification and Activity Descriptions
ON to OFF
OFF to ON
LED Color
LED Indicator
LED Label
LED
Location
Failure detected
Self-test passed
Green
Module status
OK
All
modules
Diagnostic test running
Failure detected
Red
Module status
FAIL
Module offine
Module online
Green
Module status
ONLINE
109
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