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电信网正在从相对固定的网路向速率可变的灵活的传输网路发展,其最终目标是实现基于ATM的宽带ISDN.在开发新终端的过程中,一些新业务和新通信应用(特别是多媒体通信)也应运而生.ATM技术具有许多对网络体系结构有很大影响的特性,其中最主要的是:——传输速率和电路数量具有灵活性;——复用与传输速率无关;——可有虚通道;——可以统计复用.一、现状现在的情况是存在着无限的通信应用,有的面向各工业部门,有的是基于众多的应用.通信界的复杂性是由于人们使用了各种各样的网络.迄今为止,公众电话网是其中最大的网.通过电话网处理的各种数据应用,如经调制解调器和传真机的数据传输,使得公众电话网又成为最大的数据网,尽管它的数据传输速率极低.
The telecommunications network is moving from a relatively fixed network to a flexible, rate-agile transmission network with the ultimate goal of implementing an ATM-based broadband ISDN.In the development of new terminals some new services and new communications applications, in particular Multimedia Communication) also came into being.ATM technology has many characteristics that have great influence on the network architecture, the most important ones are: - The flexibility of the transmission rate and the number of circuits; - Reuse and transfer rate has nothing to do; There can be virtual channels; - Can be statistically multiplexed. First, the status quo The situation now is the existence of unlimited communication applications, and some for the various industrial sectors, some based on a large number of applications.The complexity of the communication community is due to the use of each To date, the public telephone network is the largest of these networks. Various data applications handled through the telephone network, such as modem and fax machine data transmission, have made the public telephone network the largest data network despite the fact that, Its data transfer rate is extremely low.