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PPENDIX
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T
ROUBLESHOOTING
Diagnosing Switch Indicators
Troubleshooting Chart
Symptom Action
Power LED is Off • Internal power supply has failed or is
disconnected.
• Check connections between the switch, the
power cord, the wall outlet.
• If the switch is installed in a rack, check the
connections to the punch-down block and patch
panel.
• Contact SMC Technical Support.
Power LED is Flashing • The switch is either downloading firmware or
running the Power-On Self-Diagnostics Test
(POST). If this LED does not stop flashing, then
POST has failed, and you should contact SMC
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.
• 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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