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E120 and E320 11.1.x Hardware Guide
Troubleshooting Power Failures
The system's distributed power system is designed to consume low levels of power
and dissipate low levels of heat. See "System Specifications" on page 91 for
specifications of power consumption and heat dissipation. If you suspect a power
problem, see Table 9 on page 80.
Table 9: Causes of Power Failures
Symptom
Possible Problems
System does not
System is not receiving
power up.
power.
Module's power supply has
malfunctioned.
Power source cannot handle
system load.
System shuts
Temperature is too high.
down.
Power is lost.
Understanding Status LEDs to Troubleshoot
Module LEDs can show you the immediate status of a module and alert you to a
problem with the module or one of its ports. We recommend you familiarize yourself
with LED activity so that you can easily detect and correct a module-related problem
with minimal or no system downtime.
LED Identification
Most modules have two sets of status LEDs. The top set indicates basic functional
status of the router or module. The bottom set indicates system status for that module,
such as port status (line modules and IOAs) or fan status (SRP modules). See Figure
32 on page 81 and Figure 33 on page 81 for LED locations and labeling. See Table
10 on page 82 for descriptions of LED activity for all modules and IOAs.
80
Troubleshooting Power Failures
Actions
The following actions apply to all of the possible problems:
1.
Verify that all power connections are correct.
2.
Verify that the power supply is delivering the correct voltage,
current, and wattage to the system. See "System Specifications"
on page 91.
3.
If the system still does not operate, contact the Juniper Networks
Technical Assistance Center (JTAC).
The following actions apply to all of the possible problems:
1.
Verify that power connections are properly attached.
2.
Verify that system is receiving power.
3.
Look to see whether or not the LEDs are lit.
4.
Run diagnostics on SRP and line modules.
5.
If system does not reset, contact JTAC.
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Troubleshooting
