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EEE(Energy Efficient Ethernet)

2013年8月4日 / 385次阅读
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EEE(Energy Efficient Ethernet),802.3az, Nov 2010.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps4324/white_paper_c11-676336.pdf

(1)“BASE-T” interfaces (i.e. 10BASE-T; 100BASE-TX; 1000BASE-T; and 10GBASE-T) that operate over twisted pair wiring; (2) It was accepted that interfaces complying with the new standard might not save energy when connecting with older devices as long as the existing functions are fully supported; (3) The standard for EEE defines the signaling necessary for energy savings during periods where no data is sent on the interface, but does not define how the energy is saved, nor mandate a level of savings; (4) Edge devices may be able to enter a deep sleep state while maintaining a network link to help ensure security and to wake in response to a network request. In such a deep sleep, the edge device may require a longer wake time, which can be negotiated using the link layer protocol defined in the standard.
跟auto-negotiation一样,都是纯物理层的信号交互协商;

The fundamental idea of EEE is that the communication link should need to consume power only when real data is being sent. In order to save energy during times where there is a gap in the data stream, EEE uses a signaling protocol that allows a transmitter to indicate that there is a gap in the data and that the link can go idle. The signaling protocol is also used to indicate that the link needs to resume after a pre-defined delay.

Low Power Idle, LPI.

上层应用无需考虑EEE在正常转发和LPI之间的转换;但是由于wakeup需要时间,特别是从deep sleep起来,有一些时延特别敏感的业务,比如HPC,金融交易方面的业务,要考虑EEE增加的时延;

本文链接:http://www.maixj.net/ict/energy-efficient-ethernet-5303

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