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Power over Ethernet (PoE) is defined by a standard set forth by the Institute of Electrical and Electronics Engineers (IEEE) 802.3af task force. The IEEE standard defines the functional and electrical characteristics of two optional power (non-data) entities, a Powered Device (PD) and Power Sourcing Equipment (PSE). These entities allow devices to supply or draw power using the same generic cabling as is used for data transmission.
PoE technology safely and reliably transmits data and operating power (15W, 48V) over existing Cat5/Cat5e/Cat6 LAN cables. This technology allows Wireless LAN access points, IP phones, and IP cameras to safely receive power over standard category 5 LAN cabling without modification to existing infrastructure.
Freescale has provided Power over Ethernet solutions in addition to standard product Powered Devices. SMARTMOS™ technology provides the robust precision analog circuitry as well as the digital logic needed to function in the 802.3af environment and provide the required functional and electrical characteristics. Freescale has been jointly developing advance ASICs for Power Sourcing Equipment since 2003. Freescale continues its participation with the IEEE in developing the next IEEE 802.3at standard known as Power over Ethernet Plus.
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