John Cowley BA, Dip TEO, MSc, MEd (auth.)'s Communications and Networking: An Introduction PDF

By John Cowley BA, Dip TEO, MSc, MEd (auth.)

ISBN-10: 1846284880

ISBN-13: 9781846284885

ISBN-10: 184628645X

ISBN-13: 9781846286452

Communications and Networking: An Introduction presents a transparent and simple to keep on with remedy of the topic, written particularly for undergraduates who've no earlier event within the box. the writer takes a step-by-step process, with examples and workouts designed to provide the reader elevated self assurance in utilizing and figuring out communications systems.

Topics lined contain communications applied sciences, networking types and criteria, neighborhood sector and huge quarter networks, community protocols, TCP/IP-based networks and community management.

Key features:

• comprises lots of fabric on instant communications, either fastened and mobile

• deals insurance of community security

• positive aspects many explanatory diagrams

• contains a complete glossary

Written via John Cowley, a lecturer with a long time' event educating undergraduate programmes, the textual content takes the reader in the course of the necessities of networking and gives a complete, trustworthy and thorough remedy of the subject.

The Author's site presents additional fabric within the type of strategies, extra examples and different appropriate topic materials.

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Sample text

37. FSO systems can work over distances of several kilometres. The transceivers will work through windows and so it is not even necessary to mount them on the roof of a building. As with infrared systems, no licensing is necessary. 11 Summary This chapter has looked at some of the technologies that are used for computer communications. 37. Free space optics and duplex, half-duplex and full-duplex communications. The distinctions between data rate, bandwidth and throughput were then explained. Modulation and encoding, error control methods, switching and multiplexing were then discussed.

For this reason, high towers are commonly used to relay microwave transmissions (see Fig. 35). Rain can interfere with microwave signals. Various ways in which microwave transmission can be used are explored in Chapter 10. Satellites Microwave signals can be sent over very long distances using satellites. Although the cost of launching a satellite is high, it can carry a vast amount of traffic. 35. Line-of-sight microwave transmission a number of transponders (transmitter/responders). These listen for incoming radio signals, boost them and then retransmit them at a different angle from the angle at which they arrived.

The kind of cable that is necessary in such a situation is called a crossover cable. The way in which a crossover cable is used is shown in Fig. 32. Both these kinds of cables would normally be UTP, but STP or ScTP could be used instead. 31. 32. 2 Fibre Optic Cable Instead of using electrical currents to represent data, optical fibre carries a beam of light. The fibre cores are made of glass (or plastic). Cladding, consisting of glass (or plastic) of a refractive index different from that of the core, surrounds each fibre.

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Communications and Networking: An Introduction by John Cowley BA, Dip TEO, MSc, MEd (auth.)

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