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接入网是通信网发展和演变的主要方向之一，也是近年来我国电信技术界及运营业均感兴趣的热门话题之一。接入网是通信网的重要组成部分，是本地交换机和用户之间的传输系统。进入80年代后，随着电信技术和计算机技术的发展与融合，电信网迅速地向数字化、智能化、综合化和个人
Access network is one of the main directions for the development and evolution of communication networks. It is also one of the hot topics that both telecom technology circles and operators in China are interested in. The access network is an important part of the communication network and is the transmission system between the local switch and the users. Into the 80’s, with the telecommunications technology and computer technology development and integration, the telecommunications network to the digital, intelligent, integrated and individual