Download Data communications and networks 3 by R.L. Brewster PDF

By R.L. Brewster

ISBN-10: 0852968043

ISBN-13: 9780852968048

Assurance includesbroadband ISDN expertise, neighborhood sector networks (LANs), community administration and the ideas and methods on hand for the availability of information communications.

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Example text

Indeed, different toys can use different techniques. Provided the standards are met at the boundary or interface (in this case the air between the toy and the child) then communication will be successful. Notice that the standards impose no a priori restrictions on the choice of technology. Any existing sound reproduction technique can be used and the choice can be made on performance and economic grounds. Also, the way is left open for any new, as yet undiscovered, method to be used. This example shows that it is sufficent to standardise what happens at a boundary or interface.

A de facto standard (literally in fact ) is a standard which has been adopted informally by a community of interest. It is often a proprietary scheme which has been used because there is no de jure standard. An example of this is the well known AT command set for the control of dial-up asynchronous modems which was originally devised by a single modem manufacturer. Sometimes a de facto standard is adopted by a standards body and becomes dejure. Recently a number of industry fora have sprung up.

Data communications standards permit systems (that is computers and terminals) from different suppliers to be interconnected and communicate successfully. These standards also permit equipment to be connected to public communications networks. An example of the importance of this is the facsimile (fax) machine. If no standards existed this communications medium would be little used since Data transmission standards and interfaces 37 only machines from the same manufacturer would be able to communicate.

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