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本文叙述一种新的用户通讯系统及其基本设计原理.除电话通讯以外,系统同时能提供数据通讯、静止图片通讯等.系统的组成包括字包话音/数据终端、业务交换设备以及连接它们的数字用户环路.它有效地利用现有的用户线路,完全适合于未来的电话和数据公用数字网络.64Kb/S的PCM编码话音通话和48Kb/S的数据通讯、同时在96Kb/S的数字用户线上完成,距离可达2KM.
This article describes a new user communication system and its basic design principles.In addition to telephone communications, the system can provide data communications, still picture communications, etc. The system consists of a packet voice / data terminal, business switching equipment and connect them Digital Subscriber Line. It effectively utilizes existing subscriber lines and is well suited for future digital telephone and data digital networks. 64Kb / s PCM encoded voice calls and 48Kb / s data communications, while the 96Kb / s digital Users online to complete, the distance up to 2KM.