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PoE (Power over Ethernet) describes any of several standardized or ad-hoc systems which pass electrical power along with data on twisted pair Ethernet cabling. This allows a single cable to provide both data connection and electrical power to devices such as wireless access points or IP cameras. Unlike standards such as Universal Serial Bus which also power devices over the data cables, PoE allows long cable lengths. Power may be carried on the same conductors as the data, or it may be carried on dedicated conductors in the same cable. PoE Network Switches (Power sourcing equipment) is a device such as a switch that provides (or sources) power on the Ethernet cable. The maximum allowed continuous Shipment power per cable in IEEE 802.3af is 15.40 W. A later specification, IEEE 802.3at, offers 25.50 W. When the device is a switch, it is commonly called an endspan (although IEEE 802.3af refers to it as endpoint). Otherwise, if it's an intermediary device between a non-PoE capable switch and a PoE device, it's called a midspan. An external PoE injector is a midspan device.
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