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4-2
Troubleshooting
Diagnosing With the LEDs
Diagnosing With the LEDs
LED patterns on the switch may indicate a problem condition.
1. Check in the table for the LED pattern that you see on your
switch.
2. Refer to the corresponding diagnostic tip on the next few pages.
Problem Resolution
Switch fails Power On
Self Test (POST)
Troubleshoot using the LEDs. See “Diagnosing With
the LEDs” on page 4-2
Link light does not light
when a cable is
connected.
Look for loose or obviously faulty connections. If
they appear to be OK, make sure the connections
are snug. If that does not correct the problem, try a
different cable.
LED Pattern Indicating Problems
Diagnostic Tips
Power Fault Port Link
Off with power
adapter plugged in
**
➊
On Prolonged On *
➋
On Off Off with cable
connected
➌
* This LED is not important for the diagnosis.