What is Power over Ethernet?

Power over Ethernet (PoE) is an exciting and relatively new technology that allows networked devices to obtain power as well as data from existing Ethernet cabling. It is used to power VoIP phones, webcams and other devices such as Inova's OnTime digital clocks, analog clocks, and OnTrack X Series digital displays.

Power over Ethernet is a network standard, called IEE802.3af, approved by the IEEE Standards Board on June 12, 2003. It extends existing Ethernet standards, and offers the first truly international standard for power distribution. Delivering both data and power over one set of wires simplifies installation, saves space and eliminates the need for electrical outlets. Additionally, the option of centralized UPS backup allows PoE devices to continue running even in the event of a power failure.

What Do I Need to Support PoE?

Part of the beauty of PoE is that existing Ethernet switch equipment and cabling can be retained. Simply add a midspan power injector in a switch room or endpoint to inject power into the twisted pair LAN cables (midspan PoE power injectors are available from most network equipment vendors). PoE is fully compatible with both powered and non-powered 10/100BaseT Ethernet devices, featuring a "discovery process" specifically designed to prevent damage to existing Ethernet equipment.

For additional information about PoE please visit the Power over Ethernet Resource Center.