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Checkpoint Siginals

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Checkpoint Signals

IT/242 March 16, 2012 Howard Sims

Although voice, data, and video signals travel along the same physical media as one another, many differences exist in the way these signals are actually transmitted. In order to transmit voice signals, a telephone uses a thin diaphragm in the telephone receiver to reproduce vibrations caused by the changing tones in a human voice. Electrical signals that are analogous to the waves produced by a caller’s headset diaphragm flow over the network medium. Voice signals require a dedicated circuit and are not able to use error control because of time restraints. If voice signals were to arrive out of order (like a data signal can afford to do because of the error-correcting information contained in data packets), then they would not be of much use; the voice would sound garbled an unintelligible. Data signals can arrive out of order with little detriment. Header information on packets allows the entire transmission to be reassembled in the correct order before the data is used by an application. Because of this leniency, data networks can make use of packet switching networks. Made up of data, video signals require the same reliability of signal delivery that data signals require, but also have the same time restraints inherent on voice

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