3Com 3C16491 manual Rear Panel, Power LED

10/100/1000BASE-T Ports

Status	Meaning
Yellow	The port is operating in full duplex mode.
Off	The port is operating in half duplex mode.

1000BASE-T only operates in full duplex mode. 10/100BASE-TX can be in half or full duplex mode.

Gigabit Combo Ports

Status	Meaning
Green	SFP is inserted in the slot.
Off	No SFP in the slot.

(5) Power LED

The Power LED shows the power status of the Switch.

Status	Meaning
Green	The unit is powered on and ready for use.
Yellow	Internal power, POST, or loopback test has
	failed. Switch is in fail-safe mode.
Off	The unit is not receiving power.
	■ Check that the power cord is connected cor-
	rectly.
	■ If the unit still does not operate, contact your
	supplier.

Physical Features 13

(6) Self-adhesive Pads

The unit is supplied with four self-adhesive rubber pads.

Do not apply the pads if you intend to rack mount the unit.

If the unit is to be part of a free-standing stack, apply the pads to each marked corner area on the underside of the unit. Place the unit on top of the lower unit, ensuring that the pads locate with the recesses of the lower unit.

Rear Panel

The rear panel of the Switch contains a power supply socket and a recovery button.

(7) Power Socket

The Switch automatically adjusts to the supply voltage. Only use the power cord that is supplied with the unit.

(8) Recovery Button

The recovery button reinitializes the Switch. This returns the Switch to the factory default settings if, for example, you have forgotten the default IP address, or forgotten your user name or password.

CAUTION: 3Com recommends that you back up your configuration settings before you recover the Switch, otherwise your configuration may be lost. Refer to “Resetting to Factory Defaults” on page 73 for details.