Introduction of PoE (Power over Ethernet)

PoE (Power over Ethernet) is a technology of the local area network , to provide DC power to powered device, it has been widely used in industrial applications in the enterprise and via twisted pair.

According to statistics, in 2006, power over Ethernet deliveries is 32 million ports, in 2011, deliveries will grow to 145 million ports, the annual growth rate will exceed 30%. The current industry standard used for PoE IEEE 802.3 af, the standard provides a power supply device powered device powered via Ethernet to the 13W or less. It can meet demand for the traditional IP phones and network cameras, but with the advent of dual-band access, video telephony, PTZ video surveillance systems of high power applications, 13W power supply obviously can not meet the demand, therefore, IEEE began to develop new PoE standard 802.3at (PoE Plus) to improve PoE power which can be transmitted in 2005.

Compared with 802.3af, 802.3at can output power about 2 times, the output power of each port can reach in more than 30W, it can significantly broadened the application areas of PoE. 

Comparative 802.3at. Although 802.3ats not yet officially launched, but the industry manufacturers began to launch the standard devices to meet the pre-IEEE802.3at.

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Sept. 21, 2015