By Housley, Trevor.
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Additional info for Data Communications & Teleprocessing Systems, Second Edition
Example text
We sometimes call the bit-an element or a level, so the character-handling ·capability of the code is limited by the number of bits, elements, or levels that the code contains. For example, a one-bit code means that you can have two characters, so that we could encode the letter A and the letter B where the letter A was represented by the 0 state and the letter B was represented by the I state. A two-element code would enable us to handle four characters. We could encode, for example, the letter A as the binary combination 00, B could be combination 01, C could be combination 10, and D could_ be combination 11.
It may incluqe priority informqtion; it may include date and time information relating to when the message was sent; it may identify the communication line that carried the message; it may contain security information; and so on. ~f---------0 - Direction of transmission Header Text block 1 Text block 2 Text block 3 Text block 4 Figure 2-19 Segmented message. 41 Transmission Codes The header is not usually relevant to the information content of the message; rather, it indicates how the message is to be handled on the way from the originator to the final recipient.
This way we have a two-way alternate data flow situation, which is correctly called an either-way transmission system but is more commonly referred to as a half-duplex system (abbreviated HDX). Polite conversation is half-duplex. I talk to you, then you talk to me. Pressto-talk radio systems such as those used in police cars and taxis are half-duplex. When the taxi driver presses the button on his microphone, he can talk to his base but he cannot hear his base; when he releases the button, he can hear the base but he cannot talk to the base.