A-1
Appendix A: Troubleshooting
Diagnosing Switch Indicators
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.
However, if the unit powers off after running for a while, check for loose power
connections, power losses or surges at the power outlet. If you still cannot isolate
the problem, then the internal power supply may be defective.
Table A-1 Troubleshooting Chart
Symptom Action
Power LED is Off • Check connections between the switch, the power cord, and the wall
outlet.
• Contact your dealer for assistance.
• Contact our Technical Support.
Link LED is Off • 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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