Introduction to Data Communications

Data communication has been with us for a long time. Smoke signals, drum beats, and semaphore signals are examples that are commonly given; indeed, semaphore relay may be regarded as the first modern communication network [1]. But the most remarkable example must surely be alphabetical writing. The concept of conveying information by successive choices from a finite alphabet is the very essence of both writing and digital data communication [2]. In fact, many of the ideas of linguistics carry over to information theory, communications, and pattern recognition. It is the purpose of this first chapter, in a book devoted to the principles of data communications, to provide a perspective on the technology of data communications, and to highlight the broad applicability of the foundation technologies of modulation/demodulation, equalization, coding, and synchronization. In this text we will demonstrate the communication-theoretic origin and the broad application of these technologies to a variety of communication media, including the telephone channel, twisted pairs, radio, magnetic recording, and optical fiber.

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