传真通信是一种远距离传输静止图像的通信手段，目前主要借助于庞大的公用电话交换网来完成通信任务。由于电话网主要是为传输话音而设计的，对高速、高质实现传真通信还存在一些不足，主要表现为：1．利用公用电话交换网进行传真通信是一种“传真机一传真机”的点到点的通信模 Fax communication is a long-distance transmission of still images means of communication, mainly by means of a large public switched telephone network to complete the communication tasks. Because the telephone network is mainly designed for transmitting voice, there are still some shortcomings on high-speed and high-quality facsimile communication. The main manifestations are as follows: 1. Facsimile communication using the public switched telephone network is a point-to-point communication module of a “facsimile-facsimile machine”