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“一线通”(ISDN)顾名思义,就是能在一根普通电话线上提供语音、数据、传真、可视电话、会议电视、图像等综合业务,用户只用一对电话线连接不同的终端,即可以进行不同类型的业务通信,并可连接8台终端或电话,有两台终端(例如:一部电话、一台计算机或一台数据终端)可以同时使用。家庭用户利用一对用户线可实现电话、传真、可视图文、数据通信等多种业务的通信。不同于普通电话从用户端到局域端是模拟线路,ISDN在“最后一公里”实现了数字连接。“一线通”
ISDN, as the name implies, provides integrated services such as voice, data, fax, videophone, videoconference, video and so on over an ordinary telephone line. Users only use one pair of telephone lines to connect different terminals, namely Different types of business communication are possible, and eight terminals or phones can be connected. Two terminals (for example, a phone, a computer, or a data terminal) can be used at the same time. Home users use a pair of subscriber lines to enable telephony, fax, videotex, data communications and other business communications. Unlike ordinary telephone lines from the client to the local end of the analog line, ISDN in the “last mile” to achieve a digital connection. “One-pass”