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随着Internet的爆炸式发展,在Internet上的商业应用和多媒体等服务也得以迅猛推广。要享受Internet上的各种服务,用户必须以某种方式接入网络。为了实现用户接入网的数字化、宽带化,提高用户上网速度,光纤到户(FTTH)是用户网今后发展的必然方向,但由于光纤用户网的成本过高,在今后的十几年甚至几十年内大多数用户网仍将继续使用现有的铜线环路,于是近年来人们提出了多项过渡性的宽带接入网技术,包括N-ISDN、Cable Modem、
With the explosive development of the Internet, commercial applications and multimedia services on the Internet have also been rapidly promoted. To enjoy the various services on the Internet, users must somehow access the Internet. In order to realize the digitization and broadband of the user access network and improve the speed of Internet access for users, FTTH is an inevitable direction for the future development of the user network. However, due to the high cost of the optical fiber user network, even in the next few years or even several Most user networks will continue to use existing copper loops within a decade, so in recent years many transitional broadband access network technologies have been proposed, including N-ISDN, Cable Modem,