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Power over Ethernet (PoE): an energy-efficient Ethernet solution

  Introduction: the power consumption of the Ethernet switch

    In the modern network infrastructure, information technology and data center managers is to reduce Ethernet switches, routers and server equipment to find the green power options. This requires a more environmentally friendly products on the market,tow rope thereby reducing operating costs. For example, the year of Internet traffic in 1993 totaled hundreds of TB. In the 17 years after 2010, the second of Internet traffic reached hundreds of TB. In fact, today, more than 50% of the data center operating costs for equipment cooling, namely fans and air conditioning systems to provide electricity.

    Traditional high-performance network equipment design requirements, while power and energy efficiency measure is not clear. battery clip Specifically, energy efficiency and support for Power over Ethernet protocol (PoE Protocol) network equipment out of touch. This result is in network markets, the rapid growth of power equipment, especially high-frequency applications processor device power consumption.

    Taking into account each year over three hundred million Ethernet switch ports sold, caused by the idle line power loss resulted booster cables in a significant and noteworthy common problem. IEEE Energy Efficient Ethernet standard came into being, the goal is to significantly reduce the 600 million sold each year in power in multiple Ethernet ports. However, this standard could not cope with this situation: When the Power over Ethernet system deployment, most of the power loss occurred in the Ethernet subsystem - not in the data part.

    In 2010, ratchet tie dowm nearly seven ten million Ethernet switch ports were sold to the system on the market. Ethernet system for deployment of power by the support of IP phones, WLAN networks, IP security applications and other enterprise applications, this is their focus. For example, a standard 48-port Ethernet switch to be allocated only 50 watts to 80 watts of power in the traditional Ethernet switches and transceiver IC. And the Ethernet switch on the power supply system, but need to supply 370 watts to 740 watts of electricity. The 8:1 contrast coefficient means that Ethernet power supply system to enhance energy efficiency on a small Ethernet switch can greatly improve the overall energy efficiency.

    Traditional Energy Efficient Ethernet (EEE)

    In response to the growing power of Ethernet switch, IEEE 802.3az research standards developed and approved. This standard called Energy Efficient Ethernet standard (EEE). The standard Base-T Ethernet transceiver (100Mb, 1GbE and 10GbE) and backplane physical layer provides a low-power idle (LPI) mode applications.

    Energy Efficient Ethernet standard is based on a basic concept: the capacity utilization is low or idle period of time, disconnect the power connection, and in the data transmission period, to restore the power connection. This concept is based on a well-known fact that standard network environment the client and server Ethernet connection is idle most of the time. The data traffic peak occurs only occasionally.

    EEE for low power idle (LPI) protocol in detail. The agreement ends the physical connection by sending signals to control connected devices to achieve rapid adjustment of power-saving mode - including in the absence of data during transmission, turn off the power to stop the system data transmission and reception. In addition, the Energy Efficient Ethernet standard is also another protocol in detail. The agreement to maintain the low power idle (LPI) mode of the Ethernet physical layer parameters to update the operating system, so as to maintain connection stability and to prevent disconnection. In addition, the Energy Efficient Ethernet standard is also the signals of the side agreement in detail. This agreement shows the physical connections when needed and to achieve fast recovery. As a result, the high level of Ethernet physical layer technology, low-power idle (LPI) Ethernet connection for each application can save a watt. Nevertheless, the Energy Efficient Ethernet Standard Ethernet can not respond to depletion of the problem, not solve the problem of how to reduce energy consumption.

    Ethernet power supply system (PoE) energy-saving mechanism

    The use of Power over Ethernet, rather than the traditional AC (AC) power supply module used in the device is an important reason is that it can remotely shut down equipment, can also reduce the amount of cabling. By controlling the device on and off, a lot of energy to be saved. For example, through a central control point, the camera used at night to use during the day can be turned off (or vice versa); IEEE802.11WLAN access point can be opened, thereby enhancing the coverage and bandwidth, or low-use period of closure; and IP phone at night, weekends or idle period can be closed.

    In the multi-port devices, data also proved the advantages of Power over Ethernet. A separate AC power supply module must supply a piece of equipment needed to power all modes of operation, and multiple Ethernet devices shared power mode can be adjusted based on the average energy efficiency - it is like being for many years of POTS telephony. This greatly reduces the idle phase switching power supply of the amount of energy loss. This part of the energy savings are usually accounted for the highest power load of 10% -20%. When it is necessary to provide more power, additional power supply device can be installed to the middle of Ethernet switches and Ethernet devices to ensure the power supply requirements based on business growth adjusted.

    Energy Efficient Ethernet power supply system (EEPoE): advanced energy-saving technologies Power over Ethernet

    With Power over Ethernet technology, from very low levels of electrical power (12.95 watts per port) to power up to 25.5 watts of power level. During this period, the Ethernet cable on the power consumption to grow exponentially. About 4.5 watts / port of power in the CAT5, CAT5e, CAT6, CAT6A cable loss in the 100 meters and 25,000 meters in length, after experiencing the worst cable loop resistance problems (for example, cable transmission efficiency is only 25.5 / 30, equivalent to 85% transmission rate). Even if the application of 54 volts to 50 volts, replace the transmission efficiency will not exceed 87%. Remember, each of the traditional energy-efficient Ethernet connection is usually no more than one watt energy saving. Response due to inefficient power transfer due to each Ethernet connection loss of 4.5 watts of power, we need to save more energy.

    In the same 25-ohm cable for power transmission, new energy-efficient Ethernet technology by simultaneous use of four pairs of wire in IEEE802.3at compatible with the technology can be transferred to 94% efficiency. Using four pairs of lines simultaneously, using all the available wires, equipment, power requirements can be met. For example, in IEEE802.3at-2009Type2 system 24-port (transmission power per port up to 25.5 watts), more than 50 watts of power to be saves.

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