3Com Baseline 2226-PWR Plus User Manual

Also see for 3C16475BS: Datasheet

Contents

54 CHAPTER 6: T ROUBLESHOOTINGBy default, the Switch will allow a device to receivepower as long as the PoE power supply has 18 wattsspare in its power budget. If this much power is notavailable, the device will not be powered (unless it hasa higher priority than the ports that are currentlypowered) and a Power over Ethernet fault will bereported for that port. If enough power subsequentlybecomes available, the port will be powered.■ Verify that the port has not had a power limitimposed upon it.A PoE device is plugged in, but the PoE LED isoff.If a device is not supplied with power after you haveconnected it to the Switch 2226-PWR Plus, check thefollowing:■ The power budget for the Switch (156 watts) hasnot been exceeded.■ The cable used to connect to the device is in goodshape and is a Cat 5 or above grade.■ The device is Power over Ethernet compliant and isconfigured to receive Power over Ethernet. See thedocumentation supplied with your device.■ You are using ports 1 to 24.Solving Corrupted FirmwareIf the firmware becomes corrupted, you must either:■ Upgrade the firmware for the Switch■ Reset the Switch to factory defaultsWhen the firmware is corrupted, the Switch automat-ically goes into Fail-Safe mode.To upgrade a corrupted firmware:1 Download the latest firmware from the 3Com Website to the computer that you are using to access theWeb interface.2 Access the Web interface. The Fail-Safe Mode screenappears, as shown in Figure 29.3 Click Browse, and then follow the onscreen instruc-tions to upgrade the Switch to the required version offirmware.To reset the Switch to its factory defaults, follow theinstructions in “Resetting to Factory Defaults” onpage 51.CAUTION: Before recovering the Switch, save theSwitch’s current configuration. Recovering the Switchwill cause the current configuration to be lost.If the Problem PersistsIf the problem persists and the unit still does notoperate successfully, contact your 3Com networksupplier with the following information before return-ing the unit:■ Product number and serial number (printed on alabel supplied with the unit).■ A brief description of the issue