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Troubleshooting
Diagnosing Switch Indicators
Symptom
Power LED is Off
Link LED is Off
Power and Cooling Problems
If the power indicator does not turn on when the power cord is plugged in, you may
have a problem with the power outlet, power cord, or internal power supply as
explained in the previous section. However, if the unit powers off after running for a
while, check for loose power connections, power losses or surges at the power
outlet, and verify that the fans on the unit are unobstructed and running prior to
shutdown. If you still cannot isolate the problem, then the internal power supply may
be defective.
Installation
Verify that all system components have been properly installed. If one or more
components appear to be malfunctioning (e.g., the power cord or network cabling),
test them in an alternate environment where you are sure that all the other
components are functioning properly.
Troubleshooting Chart
Action
• Check connections between the switch, the power cord and the wall
outlet.
• Check the power outlet by using it for another device.
• Contact your dealer for assistance.
• Verify that the switch and attached device are powered on.
• Be sure the cable is 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 adapter on the attached device and cable connections for
possible defects. Replace the defective adapter or cable if necessary.
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