IEEE 802.3at-2009.pdf

vip

IEEE Std 802.3at-2009
(Amendment to IEEE Std 802.3-2008)

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 3: Data Terminal Equipment (DTE)
Power via the Media Dependent Interface (MDI) Enhancements

Approved 11 September 2009

Abstract: This amendment includes changes to IEEE Std 802.3-2008 to augment the capabilities of IEEE Std 802.3 with higher power levels and improved power management information.
Keywords: Data Link Layer classification, MPS, PD, PI, POE+, power, Power over Ethernet plus,PSE, Type 1, Type 2

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lyhummer

看看，正好需要。。。。。