3Com 3CR17451-91 manual Solving Hardware, Problems, Port Status LED is flashing green/yellow

Solving Hardware Problems 47

■ An internal fan has malfunctioned. If a fan has stopped spinning, power off the unit and check the air vents for obstructions. If this situation occurs, the Fault LED will light red.

■ The internal PSU has failed and power is being supplied by an 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.

A link is connected and yet the Port Status LED for the port does not light

Check that:

■ The Switch and the device at the other end of the link (or cable) are connected securely.

	■ The devices at both ends of the link are powered-up
	■ The quality of cable is satisfactory
	■ Auto-negotiation settings are the same at both ends.
	Auto-negotiation problems will occur with 10BASE-T, 100BASE-TX or
	1000BASE-T where auto-negotiation is disabled and incorrect cables
	are being used (cross-over or straight).
Solving Hardware	In the rare event of your Switch unit experiencing a hardware failure,
Problems	refer to the list of suggested solutions below.
	An expansion module is installed and the unit will not power up
	Ensure that the expansion module is fully seated in the slot and the
	connectors are engaged so that the securing screws can be tightened.