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概述Internet的爆炸性增长要求通信企业迅速地开发出新产品，它们具有高度灵活的结构体现，支持多种协议。随着在线用户数量快速地增长，访问图形丰富的的网址，传送大文件和在线收看视频，大量的Internet数据业务持续攀升。从用户中心到局“最后一公里”的带宽的需要增加，DSL
Overview The explosive growth of the Internet requires telecom companies to rapidly develop new products that have a highly flexible architecture that supports multiple protocols. With the rapid growth of online users, access to graphic rich web sites, sending large files and watching videos online, a large number of Internet data services continue to rise. The need for increased bandwidth from the user center to the “last mile” of the station, DSL