LYCOS RETRIEVER 
Telecommunication: Signals
built 230 days ago
Modern telecommunication systems often make extensive use of a clock signal which is used to decode a transmitted data stream, synchronization. In order to accumulate and manage such streams a telco always provided the clock signal. With the advent of global communications it became necessary to have a single worldwide standard derived from a master atomic clock, or to secondary clocks synchronised to that clock. Synchronous circuits are often used between routers. Asynchronous Transfer Mode, ATM is a relatively new standard, operating at very high bit rates where synchronization outside of the data stream can result in errors.
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Advances in telecommunication and information technologies -- like the Internet and the World Wide Web -- are blurring the boundaries between traditional media and between communication industry segments. The continued trend toward a common digital representation for all kinds of signals is resulting in a convergence across many different applications. The prospects for interactivity in media that formerly were passive is creating new business opportunities. Shifts in communication policy and legislation have resulted in a major and continued restructuring of the telecommunication industry with national and global implications.
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Early forms of telecommunication include smoke signals and drums. Drums were used by natives in Africa, New Guinea and South America whereas smoke signals were used by natives in North America and China. Contrary to what one might think, these systems were often used to do more than merely announce the presence of a camp.[16][17]
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At the time of publication, telecommunication systems were predominantly based on analog electronic circuit design. The introduction of mass-produced digital integrated circuits that has enabled telecom engineers to take full advantage of information theory. From the demand of telecom circuitry, a whole specialist area of integrated circuit design has emerged, called digital signal processing.
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Modern telecommunication centres on the problems involved in transmitting large volumes of information over long distances without damaging loss due to noise and interference. shows the basic components of a typical digital telecommunications system capable of transmitting voice, facsimile, data, radio, or television signals.
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