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这一讲将叙述在数字数据交换方式中,有关线路交换方式的特点,构成线路交换的主要技术,用户接口以及连接结构和接续动作等。1.线路交换方式的特点线路交换力式是将各种速度的数据通信线路,按照图1所示的时分交换原理,通信时在收、发两终端之间确定线路的交换方式。其传输线路使用依 PCM 传输技
This lecture will describe the characteristics of the exchange mode of the circuit, the main technique of forming the circuit exchange, the user interface, the connection structure and the connecting action in the digital data exchange mode. 1. The characteristics of the circuit switching line switching power is a variety of speed data communication lines, according to the principle of time-sharing shown in Figure 1, the communication between the receiving and sending terminals to determine the line exchange. Its transmission line uses PCM transmission technology