Appendix A: Troubleshooting

Diagnosing Switch Indicators

 

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.

 

 

Power LED is Amber

• Internal power supply or RPU has failed. System is being powered by

 

connected RPU. Contact your local dealer for assistance.

 

 

Power LED Flasing Amber

• RPU has failed.

 

 

Diag LED is Flashing Amber

• Power cycle the switch to try and clear the condition.

 

• If the condition does not clear, contact your local dealer for assistance.

 

 

PoE Status LED is Flashing or

• Flashing amber indicates a high temperature warning. On amber

On Amber

indicates a thermal shutdown for the whole system. Power off the unit

 

and allow time for it to cool.

 

• Check that cooling fans on the unit are operating properly. If

 

necessary, replace the unit.

 

 

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.

 

• 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.

 

 

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, 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.

A-1

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SMC Networks SMC8126PL2-F manual Appendix a Troubleshooting, Diagnosing Switch Indicators, Power and Cooling Problems