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Consumer Electronics by S. P. Bali

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DATA SERVICES

Communication of discrete messages (data) is actually an ancient practice. In ancient times communication over distances greater than the range of human voice was provided by sight or sound of discrete signals. Further more, the first practical communication system to use electricity, the telegraph, is inherently digital. As telegraphy evolved from the original, manually based systems to fully automated systems, they developed into what are commonly referred to as message-switching networks.

As the need for modern electronic data communications increased, it was only natural that the telephone network would be used for data transmission services. The availability overshadowed numerous technical shortcomings of a network designed ...

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