3Com Baseline 2226-PWR Plus User Manual

Also see for 3C16475BS: Datasheet

Contents

18 CHAPTER 2: I NSTALLING THE SWITCHWhen the Switch is powered on, the Power LED lightsup. If the Power LED does not light up, refer to “(6)Power LED” on page 12 for more information.Checking for Correct OperationAfter you power on the Switch, it automatically per-forms 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.If the Power LED turns yellow after POST, it meansthat POST failed and the Switch has entered fail-safemode.Table 4 summarizes the possible colors for the PowerLED after POST.Table 4 Possible Power LED Colors After POSTIf POST fails, try the following:■ Power off the Switch, and then power it on again.Check the Power LED and see if POST was success-fully completed.■ Reset the Switch. See “Resetting to FactoryDefaults” on page 51.CAUTION: Resetting the Switch to its factory defaultserases all your settings. You will need to reconfigurethe Switch 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 assis-tance.Connecting a Network DeviceTo connect a network device to the Switch, use Cate-gory 5 unshielded or shielded (screened) 100 Ohm TPcables (or Category 3 cables for 10 Mbps connec-tions).For optimal connections, ensure that the cable lengthfor each connection is not longer than 100 m (328 ft).Color StateGreen The unit is powered on and ready for useYellow Power-on self-test or loopback test failed.The Switch is in fail-safe mode. This canhappen if a ports or ports fail when theSwitch was powered on.Off The unit is not receiving power:■ Verify that the power cord is connectedcorrectly, and then try powering on theSwitch again■ If the Switch still does not operate, con-tact your 3Com network supplier