IEEE 802.3af-2003.pdf

IEEE Std 802.3af-2003
(Amendment to IEEE Std 802.3-2002,
including IEEE Std 802.3ae-2002)
IEEE Standard for Information technology Telecommunications and information exchange between systems Local and metropolitan area networks Specific requirements
Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications
Amendment: Data Terminal Equipment (DTE) Power via Media Dependent Interface (MDI)

Approved 12 June 2003
IEEE-SA Standards Board

Abstract:Support for optionally powering a 10BASE-T, 100BASE-TX or 1000BASE-T DTE device via the Power Interface (PI) using physical layers defined in Clauses 14, 25, and 40. The Power Sourcing Equipment (PSE) is located at an endpoint or midspan, separate from and between the MDIs, and provides power to the Powered Device (PD) over the Link Section. The PSE detection protocol distinguishes a compatible PD from non-compatible devices and precludes the application of power and possible damage to non-compatible devices. The PSE monitors the Maintain Power Signature (MPS) and removes power when it is no longer requested or required. Optional management function requirements are specified.

Keywords:802.3af, Link Section, midspan, MPS, PD, PI, POE, power, Power over Ethernet, PSE

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