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Communication is the conveyance of a message from one entity, called the source ortransmitter, to another, called the destination or receiver, via a channel3 of some sort. A simple example of such a communication system is conversation; people commonly exchange verbal messages, with the channel consisting of waves of compressed air molecules at frequencies which are audible to the human ear.4 This is depicted in Figure 0.1.

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Q: What is a data communication model?
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