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７８．怎样选择用于计算机远程通讯的调制解调器？调制解调器是计算机远程通信的一种常用的数据传输设备。一般的调制频率都在３０００Ｈｚ以内，以适应在普通电话交换机上传送。调制解调器的通信方式有四线全双工、两线全双工和两线半双工三种；调制方式有双态频率调制（...
78. How to choose a modem for computer remote communication? Modems are a common type of data transmission equipment for computer remote communications. The general modulation frequency is within 3000Hz, in order to adapt to the transmission on the ordinary telephone switchboard. Modem communication with full duplex four-wire, two full-duplex and two half-duplex three-wire; modulation mode with bistatic frequency modulation (...