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Troubleshooting
Diagnosing LED Indicators
System Self-Diagnostic Test Failure
If the DIAG LED indicates a failure of the system power-on-self-test (POST), you can
use a console connection to view the POST results. The POST results may indicate a
failed component or help troubleshoot the problem. For more information on
connecting to the console port and using the CLI, refer to the
Management Guide.
Note a POST failure normally indicates a serious hardware fault that cannot be
rectified or worked around. If you encounter a POST failure, you should contact
your dealer for assistance.
Table 13: Troubleshooting Chart
Symptom
Action
PWR LED is Off
◆
Check connections between the switch, the power cord, and the AC
power outlet.
◆
Check the AC power outlet is supplying 110-240 VAC.
◆
Contact your dealer for assistance.
DIAG LED is blinking
Amber
◆
Power cycle the switch to try and clear the condition.
◆
If the condition does not clear, contact your dealer for assistance.
DIAG LED is blinking
Amber with PoE Mode
button pressed
◆
Turn off or unplug PoE devices until the condition clears.
◆
If the condition does not clear, contact your dealer for assistance.
Link/Act LED is Off
◆
Verify that the switch and attached device are powered on.
◆
Check the cable connectors are firmly plugged into both the switch
and corresponding device.
◆
If the switch is installed in a rack, check the connections to the
punch-down block and patch panel.
◆
Verify that the proper cable type is used and its length does not
exceed specified limits.
◆
Check the attached device and cable connections for possible
defects. Replace the defective cable if necessary.