Download Computer Communications by Robert Cole (auth.) PDF

March 28, 2017 | Structured Design | By admin | 0 Comments

By Robert Cole (auth.)

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Finally, to protect the exchange equipment from damage, no DC (direct current) is allowed through the local exchange. 1, it can be seen that the speech signal never has the same voltage continuously, whereas the data signal consists almost entirely of a continuous voltage at one of two levels. 1 Comparison of Speech and Digital Signals 26 Computer Communications continuous voltage is the DC part which would be removed by the exchange. Removing the DC part would seriously distort a digital data signal.

The CCITT is a part of the United Nations. It is concerned with enabling the individual PTTs from all over the world to co-operate and provide an international service. The CCITT is one of the most authoritative standards organisations in communications, so any standard adopted by the CCITT is very important. All of the MODEMs discussed in this chapter conform to international standards for their operation, so it is possible for a terminal user in the UK to use a timesharing computer in Germany by dialling the computer.

The constraint on data transmission is due to a monopoly on the telephone service. In most countries the telephone system is operated by licence. This licensing arrangement means that certain individual companies or a government agency, such as British Telecom, are granted a licence to provide and operate a telephone system. Most countries have a government body to run the telephones. In the United Kingdom, British Telecom have been given a licence to operate a telephone service as a private company; competition is theoretically possible but unlikely in the near future.

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