计算机网络与数据通信 - 第7章 常用网络设备

通讯是将信息从一个本地传送到另一个本地的进程称为通讯。用以实现通讯进程的系统称为通讯系统。通讯系统的三要素：由信源、传输媒体、信宿三个部份组建
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(Communication is the process of transferring information from one local to another local is called communication. The system used to realize the communication process is called the communication system. Three elements of a communication system: composed of three parts: source, transmission medium, and sink
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