116 CHAPTER 12: P OWER MANAGEMENT AND CONTROLsupplied with power if all the existing power requirements can alsobe met. See “Configuring a Guaranteed Power Plan” below. Once power has been guaranteed to a port it will be reserved forthat port even if the device or port is not currently in use.Configuring aGuaranteed PowerPlanWhen you implement a guaranteed power plan, power is reserved fordevices you choose. The Switch 4400 PWR has a set of power profiles for3Com Power over Ethernet products.Configuring a port for a 3Com Power over Ethernet device is as simple asselecting the profile for that device. If you add a device to your Switchthat does not have a profile, for example a future 3Com device or adevice from another supplier, you can also guarantee power by specifyingthe maximum power required by the device. Refer to the documentationsupplied with your Power over Ethernet device.To ensure that the Switch is able to supply power to each device forwhich it has guaranteed power, the Switch reserves the maximum powerthat each guaranteed device can draw, regardless of whether the deviceis in use. Typically, this results in the Switch reserving more power forguaranteed devices than is actually supplied to these devices.If the Switch is not able to supply power to all your devices, you maywant to consider prioritizing your devices rather than guaranteeingpower. See “Implementing a Power Plan” on page 115.To configure a guaranteed power plan use the Physical Interface >Power > Configure operation in the Web interface. See the ManagementInterface Reference Guide, supplied on the CD with your Switch fordetails of the Physical Interface > Power > Configure operation.Monitoring PowerUsageThe Switch is able to allocate and monitor power on a port by port basisand is able to monitor power usage for the whole unit. As you increasethe number of Power over Ethernet devices you use, managing the wayyou use your power becomes increasingly important.
