Specifications

4-4
Troubleshooting
Diagnosing with the LEDs
Troubleshooting
Diagnosing with the LEDs
Tables 4-1 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
Module Status
(one LED per
module)
Power Status
(one LED per
power supply)
Fan Status
Port Link
Off with
power cord
plugged in
* * *** *
➊
On Prolonged
On
Prolonged
On
*** *
➋
On Flashing
†
Flashing
†
Off ** *
➌
On Flashing
†
Flashing
†
Flashing
†
**Never On
➍
On Flashing
†
Flashing
†
Flashing
†
**On briefly,
then Off
➎
On Off Off Flashing
†
** *
➏
On Flashing
†
Flashing
†
Flashing
†
**Flashing
†
➐
On Flashing
†
Off * Flashing
†
**
➑
On Flashing
†
Off **Flashing
†
*
➒
On Off Off Off **Fast
Flashing
††
➓
On Off Off On **Off with cable
connected
* This LED is not important for the diagnosis.
†
The flashing behavior is an on/off cycle once every 1.6 seconds, approximately.
††
The fast flashing behavior is an on/off cycle once every 0.8 seconds, approximately
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