ELECTRONIC COMMUNICATIONS : Wired Digital Communications

Jun 30th, 2015
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Some of the earliest forms of electrical communications like telegraph used coding to send messages rather than direct transmission of voice. Again with advances in technology, digital communication is the promise to help ease the problems of overcrowded voice transmission facilities. The future will certainly bring more and more coded speech

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ELEC 382 ELECTRONIC COMMUNICATIONSChapter 9: Wired Digital CommunicationsCommunication Links and ProtocolsSome of the earliest forms of electrical communications like telegraph used coding to send messages rather than direct transmission of voice. Again with advances in technology, digital communication is the promise to help ease the problems of overcrowded voice transmission facilities. The future will certainly bring more and more coded speech, transmitted in digital format because of the following advantages:1. Less sensitive to noise,2. Less crosstalk (cochannel interference),3. Lower distortion levels,4. Faded signals more easily regenerated,5. Greater transmission efficiencyCoding is transforming messages or signals in accordance with a definite set of rules. There are many different codes available for use and most of the coding systems use two levels like a binary system. Communication Protocols (applied to both analog and digital systems):1. Simplex: Communication is in one direction only.2. Half Duplex: Communication is in both directions but only one can talk at a time.3. Full-duplex: Both parties can talk at the same time.Synchronous Communication: The transmit and receive data clocks are locked together.Asynchronous Communication: The transmit and receive data clocks are not locked together.Protocol Functions:To maintain order during the interchange of data, rules to control the process are necessary. Initially, procedures, allowing

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