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随着光通信技术和高速调制技术的突破，用户对高速数据业务和多媒体业务需求迅速增加，接入网技术在90年代飞速发展，非对称数字用户线路（ADSL）技术在这种背景下应运而生。ADSL能在普通电话线上产生三个互不干扰的信息通道：用于用户下载信息的1.5Mb/s~9Mb/s高速下行通道；用
With the breakthrough of optical communication technology and high-speed modulation technology, the demand of users for high-speed data services and multimedia services has rapidly increased. The access network technology has been rapidly developed in the 1990s. Asymmetric Digital Subscriber Line (ADSL) technology should be transported in this context Health. ADSL can generate three non-interfering information channels on ordinary telephone lines: 1.5Mb / s ~ 9Mb / s high speed downlink channels for users to download information;