Download Computer Communications and Networks by John R. Freer BSc, DMS, CEng, FIEE (auth.) PDF

By John R. Freer BSc, DMS, CEng, FIEE (auth.)

Computer communications is without doubt one of the such a lot speedily constructing applied sciences and it's a topic with which all people within the computers career can be ordinary. desktop communications and networks is an creation to communications know-how and method layout for practicing and aspiring machine execs. the topic is defined from the pc method designer's standpoint instead of from the communications engineer's point of view. The presentation is acceptable for introductory examining in addition to for reference. The emphasis is on sensible, instead of theoretical, features and on know-how so that it will develop into extra vital sooner or later. the vast majority of the subject material applies to civil and army communications yet a few elements that are specific to army purposes were integrated the place thought of signifi­ cant. laptop communications is a speedily altering and hugely advanced topic. adequate functional wisdom of the topic isn't really frequently received at college or university yet is mostly built over a interval of numerous years through trial and mistake, attending classes, examining reference books and journals; this e-book makes an attempt to simplify and accelerate the method via bringing jointly a physique of data that is differently disbursed all through many books and journals. the data is gifted in a framework which makes a much broader knowing of the topic attainable. uncomplicated wisdom of communications is believed, a basic famil­ iarity with desktops is predicted in later chapters, and, the place appropriate, idea is explained.

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Intelsat III, launched in 1968, had two 225 MHz bandwidth repeaters at 4/6 GHz and Intelsat IV, launched in 1971, had twelve 36 MHz bandwidth repeaters. Intelsat V launched in 1980 was the first to use the higher-frequency Ku band (11 to 14 GHz). Intelsat VI satellites launched from 1987 onwards use narrow independent beams and satellite switched time division multiple access (TDMA) to improve efficiency. The Anik satellite launched in 1972 was the first domestic satellite; it provided twelve 36 MHz bandwidth repeaters for television and communications throughout Canada.

Twisted-pairs may be employed to reduce crosstalk by making coupling between conductors in the pair much greater than the coupling to other conductors. Individually screened pairs within a multicore cable provide the best cure for crosstalk but a considerable reduction is achieved by twisting each pair in the cable at a different rate. Multicore cable is extremely expensive and is not flexible; this makes installation difficult. It is also difficult to trace the source of a break or short associated with one core.

1940 1950 Fig. 3 Trends in the use of communications media for US domestic applications Satellite ... _ ... optic 1970 1980 1960 Year 25 on these twisted-pair cables permitting simultaneous transmission of digitised voice and data. Unshielded twisted-pair is also used extensively on trunk communications links. 048 Mbit/s may be up to 1 mile in length between repeaters but this separation is frequently reduced to achieve less than a one-bit error in a million bits transmitted. 5 shows the attenuation/frequency characteristics for a 24 AWG twisted-pair telephone cable.

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