TELECOMMUNICATIONS Telecommunications systems are devices and techniques used for the transmission of information via wire, optical fibre, optical wireless, or radio wave. These systems transfer a wide variety of information, including audio (e.g., voice and music), video (still-frame and full motion), computer (files and applications), and telegraphic data. In other words, radio, televisions, telephones and computer-based data exchange or retrieval systems are examples of telecommunications systems.
Telephone and telegraph networks (e.g. telex) have long been in operation. More recently, cable television and telemetry networks, such as those used in the remote
control of automobile traffic and widely distributed industrial operations, have become prominent. Rapid advances in computer technology also have led to a dramatic growth of data-retrieval and exchange networks. Computer-tocomputer communication has also become commonplace for owners of home computers. Subscribers to special information services can interact with a host computer to access educational and entertainment materials as well as news and stock-market reports.
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