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This chapter is designed to acquaint the reader with the fundamental terms and concepts that characterize the data and telecommunications worlds today. Now we can move deeper into the magic. In the next chapter, we introduce the design, philosophy, structure, and use of data communications protocols.
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1. 2. 3. What is the difference between telecommunications and data communications What is the difference between a protocol and a standard Why do you suppose the United Nations has global responsibility for the development of telecommunications standards Why are there so many different standards bodies How do they work together to ensure global acceptance of new standards Give examples of each of the following: simplex, half-duplex, and full-duplex services. Which are most common What is the difference between intelligibility and recognizability Define the following terms: amplitude modulation, frequency modulation, and phase modulation. Explain the difference between data encoding and signaling. It is possible to transport digital data across an analog facility. Explain. In simple terms, explain the difference between the work done by Harry Nyquist and Claude Shannon.
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Source: Telecom Crash Course
CHAPTER
Protocols
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Protocols
2
Click. One simple action that kicks off a complex series of events that results in the transmission of an e-mail message, or in the creation of a digital medical image, or in the establishment of a videoconference between a child and a grandmother. The process through which this happens is a remarkable symphony of technological complexity, and it is all governed by a collection of rules called protocols. This chapter is dedicated to them.
Data Communications Systems and Functions
If I were to walk up to you on the street in pretty much any Western country, and extend my hand in greeting, you would quite naturally reach your hand out, grab mine, and shake it. There is a commonly accepted set of social rules that we agree to abide by, one of which is shaking hands as a form of greeting. It doesn t work everywhere: In Tibet, it is customary to extend one s tongue as far as it can be extended as a form of greeting (clearly a sign of a great culture!). In China, unless you are already friends with the person you are greeting, it is not customary to touch in any fashion. You, of course, had a choice when I extended my hand. You could have hit it, licked it, spit in it. But, because of the accepted rules that govern Western society, you took my hand in yours and shook it. These rules that govern communication any form of communication are called protocols. And the process of using protocols to convey information is called data communications. It s no accident, incidentally, that the obnoxious racket that analog modems make when they are attempting to connect to each other is called a handshake. The noise they make is their attempt to negotiate a common set of rules that works for both of them for that particular session.
The Science of Communications
Data communications is the procedure required to collect, package, and transmit data from one computing device to another, typically (but not always) over a wide area network. It is a complex process with many lay-
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