Computers in Communication - download pdf or read online

By Gordon Brebner

ISBN-10: 0077091981

ISBN-13: 9780077091989

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In turn, the basic T1 and E1 carrier channels can be combined to share faster channels. 3 shows other members of the Tn and En families. Note that the higher members of the families have rates that are a little larger than the exact total of the rates that can share these members. This is to allow for the transmission of extra bits of control information. Apart from T1 and E1 themselves, T3 and E4 are the most common types found in practice for leased lines. These families, where higher transmission rate channels are shared by lower transmission rate channels, are known as the Plesiochronous Data Hierarchy (PDH).

How easy do you think it would be to implement these facilities? 12 Around 65 000 films have been made since the introduction of cinema. Do you think it is feasible to operate a video on demand service that allows any user to see any film that they want at any time? 13 Radio waves, infra-red and microwaves are three examples of electromagnetic phenomena used for bit transmission. How useful do you think visible light would be as an unguided transmission medium? 14 Obtain information about the various low-orbit satellite proposals, in particular find an explanation of why the Iridium project involves only 66 satellites, whereas the Teledesic project involves 840.

Transmission rates of around 50 Mbits per second are possible with microwaves over long distances. However, when a geostationary satellite is involved as an intermediary, the latency in receiving each transmitted bit is around 250 milliseconds because of the round-trip distance of 72 000 km to and from the satellite. This latency is distinctly high in computer terms. It is much reduced if a low-orbit satellite is used instead, since the round-trip distance is reduced by a factor of around 50. Copper cable In contrast to the above unguided media, copper cable is the traditional, and most widespread, guided transmission medium.

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Computers in Communication by Gordon Brebner

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