Physical Features 1310/100/1000BASE-T Ports1000BASE-T only operates in full duplex mode.10/100BASE-TX can be in half or full duplex mode.Gigabit Combo Ports(5) Power LEDThe Power LED shows the power status of the Switch.(6) Self-adhesive PadsThe unit is supplied with four self-adhesive rubber pads.Do not apply the pads if you intend to rack mount theunit.If the unit is to be part of a free-standing stack, applythe pads to each marked corner area on the undersideof the unit. Place the unit on top of the lower unit,ensuring that the pads locate with the recesses of thelower unit.Rear PanelThe rear panel of the Switch contains a power supplysocket and a recovery button.(7) Power SocketThe Switch automatically adjusts to the supply voltage.Only use the power cord that is supplied with the unit.(8) Recovery ButtonThe recovery button reinitializes the Switch. This returnsthe Switch to the factory default settings if, forexample, you have forgotten the default IP address, orforgotten your user name or password.CAUTION: 3Com recommends that you back up yourconfiguration settings before you recover the Switch,otherwise your configuration may be lost. Refer to“Resetting to Factory Defaults” on page 73 for details.Status MeaningYellow The port is operating in full duplex mode.Off The port is operating in half duplex mode.Status MeaningGreen SFP is inserted in the slot.Off No SFP in the slot.Status MeaningGreen The unit is powered on and ready for use.Yellow Internal power, POST, or loopback test hasfailed. 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 yoursupplier.