4-4
Troubleshooting
Diagnosing with the LEDs
Troubleshooting
Diagnosing with the LEDs
Table 3-1 shows LED patterns on the switch and the switch modules that
indicate problem conditions.
1. Check in the table for the LED pattern you see on your switch.
2. Refer to the corresponding diagnostic tip on the next few pages.
Table 4-1. LED Error Indicators
LED Pattern Indicating Problems
Diagnostic
Tips
Power Fault Self Test
Fan
Status
Port LED
(in Link view mode)
On with
power cord
plugged in
Flashing * * *
➊
On Prolonged On Prolonged On * *
➋
On Flashing
†
Flashing
†
**
➌
On Flashing
†
Off Flashing
†
*
➍
On Flashing
†
Flashing
†
*Flashing
†
➎
On Off Off * Off with cable
connected
➏
On Off Off * On, but the port is not
communicating
➐
* This LED is not important for the diagnosis.
†
The flashing behavior is an on/off cycle once every 1.6 seconds, approximately.
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