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P802.3az/D2.0, Jul 2009  -  IEEE Draft 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: Media Access Control parameters, Physical Layers and management parameters for Energy-Efficient Ethernet

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This amendment to IEEE Std 802.3-2008 specifies changes to several existing physical layers to enable energy efficient operation of Ethernet. Changes to 10BASE-T include a reduction in transmit voltage requirements. Changes to 100BASE-TX, 1000BASE-T, 10GBASE-T, 1000BASE-KX, 10GBASE-KX4 and 10GBASE-KR include the definition of a low power idle mode and mechanisms to communicate and manage the entry and exit into and out of low power idle and the operation of this mode. New LLDP TLVs are defined for negotiating system level energy efficiency parameters.

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