附录4:英文资料及中文翻译
Communicating with Datal
Data signals are transmitted over various types of telephone circuits. They travel on wire from telephone pole to telephone pole, through underground cables, from mountain top to mountain top over microwave facilities, on the ocean floor in submarine cables, and munications satellites from continent to continent. Some type of data conversion equipment is required to change the digital machine signals to a form suitable for transmission over these facilities.
The data machine which provides an input to the transmit section of the conversion equipment, or modulator ,can be a keyboard , printer, card reader, paper tape puter or ic tape terminal. The output from the receive section of the converter, or demodulator, can be applied to a tape punch, printer, card punch, ic tape unit, computer, or visual display terminal. Typically, both the modulator and demodulator sections of the converter bined into a two-way data transmitter-receiver, commonly called a data modem or data set.
The typical full-duplex data transmission system including the originating data processing equipment and the interface assembly which consists of buffer and control units. The interface assembly at the transmitter accepts data at the rate determined by the operating speed of the data processor. stores the data temporarily, and regenerates it at a patible with
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