用户光缆接入网沈海啸９０年代以来，通信的高速发展取得了令人瞩目的成绩。日益增长的通信需求不仅表现在传统的话音业务上，也体现在非话通信上。人们对通信服务的种类与质量的要求越来越高，除了普通电话、传真、电传外，还要有高速数据、可视图文、会议电视、高清晰度... Subscriber cable access network Shen Haosun Since the 90s, the rapid development of communication has made remarkable achievements. The growing demand for communications is not only reflected in traditional voice services, but also in non-voice communications. People are demanding more and more kinds of communication services and quality. In addition to ordinary telephone, fax, and fax, they also need high-speed data, video, teletext, high definition ...