3Com 2426-PWR Installation And User Manual

Also see for 2226-SFP Plus: User guide

Contents

Supplying Power to the Switch 21CAUTION: The Switch has no ON/OFF switch. The onlyway to power on and power off the Switch is byconnecting and disconnecting the power cord. This iscalled “power cycling”.To power on the Switch:1 Plug the power cord into the power socket on the rearpanel of the Switch. Refer to “(9) Power Socket” onpage 15 for more information.2 Plug the other end of the power cord into a poweroutlet.When the Switch is powered on, the Power LED lightsup. If the Power LED does not light up, refer to “(7)Power LED” on page 15 for more information.Checking for Correct OperationAfter you power on the Switch, it automaticallyperforms a power-on self-test (POST). During POST, thePower LED on the front panel of the Switch flashesgreen.When POST is complete, the Power LED turns green. Ifthe Power LED turns yellow after POST, it means thatPOST failed and the Switch has entered fail-safe mode.The following summarizes the possible colors for thePower LED after POST.Table 8 Power LED POST IndicationsIf POST fails, try the following:■ Power off the Switch, and then power it on again.Check the Power LED and see if POST wassuccessfully completed.■ Reset the Switch. See “Resetting to Factory Defaults”on page 75.CAUTION: Resetting the Switch to its factory defaultserases all your settings. You will need to reconfigure theSwitch after you reset it.If these do not resolve the issue:■ Check the 3Com Knowledgebase for a solution. Tovisit the 3Com Knowledgebase Web site, start yourWeb browser, and then enterhttp://knowledgebase.3Com.com.■ Contact your 3Com network supplier for assistance.Status MeaningGreen The unit is powered on and ready to use.Yellow Power-on self-test or loopback test failed. TheSwitch is in fail-safe mode. This can happen if aport or ports fail when the Switch was poweredon.Off The unit is not receiving power:■ Verify that the power cord is connected cor-rectly, and then try powering on the Switchagain■ If the Switch still does not operate, contactyour 3Com network supplier