Juniper ERX - RELEASE 11.1.X HARDWARE GUIDE 03-23-2010 Hardware Manual page 117

NOTE: When you reboot the system after installing a new version of the software,
the line modules appear to boot twice.
Table 11: Normal Activity of Functional Status LEDS During Booting
If the system detects an error during booting, the FAIL LED lights. Some failure
conditions can cause the module not to boot. In this case, the LEDs might all be off.
The system then resets the module.
If the operational software detects an error, the FAIL LED lights. Some errors can
cause a module reset. Crash information is displayed at the console at the next reboot.
Table 12: Troubleshooting Abnormal LED Activity on Modules
Diagnostic Signs Possible Problems
POWER A OK LED
is not lit
POWER B OK LED
is not lit
FAIL LED lights
OK FAIL
off on
(off for GE-2 LM
and GE-HDE LM)
off on
on off
on off
System is not receiving
power from Power A.
System is not receiving
power from Power B.
The line module and I/O
module are incompatible.
A hardware failure, such as
a failed module.
ONLINE Status Process
off 1. Module is in the power-up restart state; the
FAIL LED stays on briefly.
off 2. Module is initializing, and diagnostic tests are
running; the FAIL LED stays on briefly.
off 3. Module passed the diagnostics; the system
boots.
on 4. Module is now up and running.
Actions
1. Make sure Power A and Power B terminal connections
are securely attached.
2. Verify that power switches are on.
3. Make sure connections to power sources are securely
attached.
4. If system still does not operate, contact Juniper Networks
Customer Service.
1. Make sure that the line modules and I/O modules are
compatible; replace if necessary.
2. If you replaced the I/O module only, issue the reload slot
slot_number command.
3. If you replaced the line module or if there was a hardware
failure, the system is supposed to automatically reset the
module.
4. If the condition persists, contact Juniper Networks
Customer Service.
Understanding Status LEDs to Troubleshoot
Chapter 9: Troubleshooting
101