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接入网的现状郑泽胜熊兆飞谢晓明在早期的电话网中，电话机与交换机间以铜导线传送音频信号（３００～３４００Ｈｚ）就可以把用户接入到电话网。随着通信技术的发展，电话网在向ＩＳＤＮ网络过渡，用户的业务种类不再是单一的话音业务。用户要求能提供话音、数据、图文传...
Access Network Zheng Zesheng Xiong Zhaofei Xie Xiaoming Earlier in the telephone network, telephone and switch copper wire to send audio signals (300 ~ 3400Hz) will be able to connect users to the telephone network. With the development of communication technology, the telephone network is transitioning to the ISDN network, and the service type of the user is no longer a single voice service. Users can provide voice, data, text ...