By Housley, Trevor.
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Additional info for Data Communications & Teleprocessing Systems, Second Edition
Here we have a computer with an in-house teleprinter and visual display terminal (VDT) and a number of remote terminals connected by communication lines. For data communication to take place, it is not necessary to use telephone lines or special-purpose data lines. In fact, most organizations indulge in data communications right now. If you want to send information from one point to another, there are various media available to perform this task. You can use the mail for transmitting documents, cassettes, or floppy disks.
Given this rule, we can invent any code that we wish. We could produce a 27-bit code and dream up all kinds of exciting possibilities for the 227 available combinations. ) However, just as the English alphabet has been standardized so that we can communicate with people all over the world, certain standardized data communication codes have been developed. Two of the more commonly used codes are Baudot code and ASCII, and we now examine these in detail. Baudot code Baudot code is named after a French postal engineer who worked on telegraphy around 1874.
Figure 2-10 Either-way (half-duplex) system. o-R_ _ _--, ~ T + + Figure 2-11 Simple either-way (half-duplex) communication system. the arrangement as shown in Fig. 2-11. With A in transmit mode and B in receive mode, A can communicate with B by pressing the pushbutton and sending current through the loop to lamp B. At the end of the communication, both people can switch their transmit/receive switches to the opposite position, and then Bean communicate with A by pressing his pushbutton and sending current through the loop and lighting lamp A.
Data Communications & Teleprocessing Systems, Second Edition by Housley, Trevor.