近年来，互联网的快速发展使上网用户不断增加，现有的用户网已难以满足用户上网需要，宽带接入设备需求开始大幅提升。据一项调查表明，未来4年内全球有线宽带用户数量将以每年62％的速度增长。由于ADSL产品无需重新铺设线路或对现有网络进行改造，而且每个用户独享接入线路， In recent years, with the rapid development of the Internet, the number of Internet users has been continuously increasing, and the existing user networks have hardly met the needs of Internet users. As a result, the demand for broadband access devices has started to increase dramatically. According to one survey, the number of wired broadband subscribers worldwide will grow 62% annually in the next four years. Because ADSL products do not need to re-lay the line or transform the existing network, and each user exclusive access line,