Juniper Networks ERX-1440, ERX-1410, ERX-700 Understanding Status LEDs, Symptom Possible Problems

Table 8-1Causes of power failures (continued)

Symptom	Possible Problems
System shuts down.	•	Temperature too high
	•	Loss of power

Understanding Status LEDs

ERX Edge Routers

Actions

Note: The following actions apply to all of the possible problems.

1Verify that power connections are properly attached.

2 Verify that system is receiving power.

3 Check whether or not the LEDs are lit.

4 Run diagnostics on SRP and line modules.

5If system will not reset, contact Juniper Networks Customer Service.

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 Table 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 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 two sets of port status LEDs are active during OC12/STM4 operation.

Table 8-2shows the functions of the module and port status LEDs.

Table 8-2LED identification and activity descriptions

LED Location	LED Label	LED Indicator	LED Color	OFF to ON	ON to OFF
	OK	Module status	Green	Self-test passed	Failure detected
All modules
	FAIL	Module status	Red	Failure detected	Diagnostic test running
	ONLINE	Module status	Green	Module online	Module offine