PoE : Computer Hardware Buyers’ Glossary

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PoE

PoE (Power over Ethernet) lets you deliver power to devices on an Ethernet LAN (Local Area Network). It can deliver DC power over long distances typically to a camera. The original IEEE (Institute of Electrical & Electronics Engineers) 802.3af-2003 PoE standard provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA) to each device. Only 12.95 W is assured to be available at the powered device as some power dissipates in the cable. The updated IEEE 802.3at-2009 PoE standard also known as PoE+ or PoE plus, provides up to 25.5 W of power. The 2009 standard prohibits a powered device from using all four pairs for power.


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