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数字用户线传输方式是研究综合业务数字网的关键课题之一。因此,世界各国都在积极地对这一课题进行研究。本文比较详细地介绍了利用现有二线用户线的双向数字传输系统的特点、传输方式的选择、系统参数的确定、线路码和时分双向数字传输系统的组成及其基本工作原理。
Digital subscriber line transmission is one of the key issues in the study of Integrated Services Digital Network. Therefore, all countries in the world are actively studying this issue. This paper introduces the characteristics of bidirectional digital transmission system using existing second-line subscriber lines, the selection of transmission mode, the determination of system parameters, the composition of line code and time-division bidirectional digital transmission system and its basic working principle.