PoE
Power over Ethernet or PoE technology describes a system to safely transfer electrical power, along with data, to remote devices over standard category 5 cable in an Ethernet network. It does not require modification of existing Ethernet cabling infrastructure. The IEEE standardized version of PoE supplies up to 15.4 W of DC power (minimum 44 VDC and 350 mA ) to each device. Only 12.95 W is assured to be available at the powered device as some power is dissipated in the cable. An updated standard in progress referred to as PoE Plus or 802.3at introduces increases available power. Numerous non-standard schemes had been used prior to PoE standardization to provide power over Ethernet cabling. Some are still in active use.
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