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The high speed network becomes an important indicator of national power in information society. The bandwidth of LAN and WAN are over the Gbps but bandwidth of subscriber access network is dozens of Mbps. Task Force team for IEEE 802.3ah has accomplished the standardization of EPON which is one of next generation subscriber access networks but it doesn't still have the bandwidth wide enough to support the new service which demands high bandwidth. Therefore IEEE 802.3av Task Force studied 10G EPON technology. It expanded the updown bandwidth range of 1G EPON 10 times in order to support a next generation multimedia service demanding high bandwidth and which is proceeding the standardization of physical layer in IEEE 802.3av Task Force.
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