By Martin Gandoff (Auth.)

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In this technique we treat each bit or byte as a digit and to divide each by a number (obtained from a 'generating polynomial' and find the sum of the remainders. At selected intervals, this sum is sent to the receiver that is performing the same calculation. A discrepancy indicates a failure. ARQ (Automatic Repeat Request) These redundancy-checking techniques are employed in the more general procedure called ARQ, in which the system either stops and waits for a reply ('ACK' usually indicating a successful receival and 'NAK' meaning that a repeat is required), or is continuous in that the sender continuously sends and receives signals.

Must be synchronised or 'in step'. It will otherwise be impossible to extract meaning from the The technique lends itself to applications where message. This must be a constant process because, characters are naturally presented as blocks, such however closely the two ends match, there will as the output from a terminal that sends lines or always be some slight differences which eventually pages of text, or particularly when such a terminal is receiving data files or text from a videotex will lead to loss of synchronisation.

Administration and supervision is in the hands of the Department of Trade and Industry. The Networks and exchanges Telecommunications Division is responsible for the licensing of the various networks offered whatever transmission medium they are based on.

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