Computers in Communication - download pdf or read online

By Gordon Brebner

ISBN-10: 0077091981

ISBN-13: 9780077091989

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Teletext has far less scope for interaction, compared with videotex. All of the available information is continuously broadcast in sequence, and then the television receiver has to filter out the information of no interest. This is in contrast to videotex, where a user explicitly initiates searches for information of interest. However, like videotex, teletext illustrates a convergence with computer-oriented communications. The rise of cable television illustrates a convergence between television and telecommunications.

This arises from the fact that perfection is not deemed necessary in order for humans to make sense of speech transmitted over the 22 COMPUTERS IN COMMUNICATION telephone. People can ignore hisses, crackles and the loss of occasional fragments of speech. In bit terms, a telephone link might have an error rate as bad as 1 in 10 000 bits sent being damaged, although modern digital links are far better. This compares with a figure of 1 in 1012 for many direct media, such as coaxial or fibre optic cable.

The key components of any particular communication are the information shared, the time period of the communication, and the space of computers and channels involved. Carrying out the communication requires agreement on the nature of the communication between the computers and channels, and the implementation of the required communication in terms of communications that can be physically realized. Communication protocols are central to this — these are rules for how communications proceed, agreed by human designers.

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Computers in Communication by Gordon Brebner


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