Power over Ethernet (PoE) allows devices to use an ethernet connection as a power source, most commonly found in IP phones. The ethernet cable provides the power for the device to operate as well as network connectivity.
Power over Ethernet or PoE describes any of several standard or ad-hoc systems which pass electric power along with data on twisted pair Ethernet cabling. This allows a single cable to provide both data connection and electric power to devices such as wireless access points, IP cameras, and VoIP phones.
There are several common techniques for transmitting power over Ethernet cabling. Three of them have been standardized by IEEE 802.3 since 2003. These standards are …