3Com 9100 manual Troubleshooting, LEDs

C

TROUBLESHOOTING

	If you encounter problems when using the switch, this appendix may be
	helpful. If you have a problem not listed here or in the “Release Notes,”
	contact your supplier.
LEDs	Power LED does not light:
	Check that the power cable is firmly connected to the device and to the
	supply outlet.
	On powering-up, the MGMT LED lights yellow:
	The device has failed its Power On Self Test (POST) and you should
	contact your supplier for advice.
	A link is connected, but the Status LED does not light:

Check that

■All connections are secure.

■Cables are free from damage.

■The devices at both ends of the link are powered-up.

■Both ends of the Gigabit link are set to the same autonegotiation state.

Both sides if the Gigabit link must be enabled or disabled. It the two are different, typically the side with autonegotiation disabled will have the link LED list, and the side with autonegotiation enabled will not list. The default configuration for a Gigabit port is autonegotiation enabled. This can be verified by entering the following command:

show port config