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通信网经历了模拟同、数模混合网、综合数字网几个发展阶段后,现正向综合业务数字网发展。ISDN是通信网发展的高级阶段,人们普遍认为ISDN将成为下一世纪的全球通信网络。ISDN具有许多优点,其中最突出的优点就是它有极大的综合服务能力,它将各业务网综合于一体。它不但提供了现有各专业网(电话网、数据网、电报网和
Communication network has gone through the simulation with the analog-digital hybrid network, integrated digital network after several stages of development, are now moving to the development of integrated services digital network. ISDN is an advanced phase of the development of communication networks and it is generally accepted that ISDN will become the global communications network of the next century. ISDN has many advantages, one of the most prominent advantage is that it has great comprehensive service capabilities, it will integrate the various business networks. It not only provides the existing professional network (telephone network, data network, telegraph network and