3Com SUPERSTACK 3 3226 User Manual

46 CHAPTER 4: PROBLEM SOLVING
Solving Problems
Indicated by LEDs
If the LEDs on the Switch indicate a problem, refer to the list of suggested
solutions below.
The Power / Self Test LED does not light
Check that the power cable is firmly connected to the Switch and to the
supply outlet. If the connection is secure and there is still no power, you
may have a faulty power cord or an internal fault. Check the power cord
by:
■ testing it in another device
■ connecting a working power cord to the ‘problem’ device
Then contact your supplier for advice.
On Powering up, the Power / Self Test LED lights yellow for about ten
seconds after which it starts flashing green.
On powering-up, the Power / Self Test LED remains yellow
This indicates one of the following:
■ A port has failed and has been automatically disabled. You can verify
this by checking that the Port Status LED is flashing Green/Yellow. This
could be due to loop back failure. If a port fails the Switch passes its
Power On Self Test and continues to operate normally.
■ An internal fan has malfunctioned. If a fan has stopped spinning,
power off the unit and check the air vents for obstructions.
■ The internal PSU has failed and power is being supplied by and
external Redundant Power Supply (RPS). Although the Switch has a
fault it will continue to operate normally.
On Powering up, the Power / Self Test LED lights yellow for about ten
seconds after which it starts flashing green. This is normal and does not
indicate any of the above conditions.
A Port Status LED is flashing green/yellow
The port has failed and has been automatically disabled. The Switch
passes its Power On Self Test and continues to operate normally, even if
one or more ports are disabled.
DUA1750-0AAA01.book Page 46 Friday, December 5, 2003 10:24 AM

3Com SUPERSTACK 3 3226 Specifications