Understanding Status LEDs
ERX Edge Routers
8-3
Understanding Status LEDs
When you power up the system, it runs a series of tests for each module
installed in the system. Refer to the tables in this section to understand
normal and abnormal LED activity. For troubleshooting information, see
Tabl e 8-4.
LED Identification
The system’s modules have two sets of status LEDs. The top set indicates
generic router and module status. The bottom set indicates
module-specific status, such as port status (line modules) or fan status
(SRP module).
The number against the port status LED on a line module corresponds to
the num ber of t he port on the I /O modul e. Some line mod ules 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 two
sets of port status LEDs are active during OC12/STM4 operation.
Tabl e 8-2 shows the functions of the module and port status LEDs.
System shuts down. • Temperature too high
• Loss of power
Note: The following actions apply to all of the possible
problems.
1Verify that power connections are properly attached.
2Verify that system is receiving power.
3Check whether or not the LEDs are lit.
4Run diagnostics on SRP and line modules.
5If system will not reset, contact Juniper Networks
Customer Service.
Table 8- 1 Causes of power failures (continued)
Symptom Possible Problems Action s
Table 8- 2 LED identification and activity descriptions
LED Location LED Label LED Indicator LED Color OFF to ON ON to OFF
All modules
OK Module status Green Self-test passed Failure detected
FAIL Module status Red Failure detected Diagnostic test running
ONLINE Module status Green Module online Module offine