IEEE 802.3af

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A newer addition to the Ethernet standards, 802.3af allows power to be delivered alongside data on a single cable. Using otherwise unused conductors within conventional Category 5 cables, this system can provide up to 11 watts of power. This allows devices in remote locations to be serviced by a single cable run, reducing the complexity of the underlying infrastructure.

Note that there are a number of proprietary PoE implementations that don't comply to the 802.3af standard. These systems perform the same function, however they are only compatible with other devices using the same implementation.