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The Cable and Telecommunications Professionals' Reference, 3rd Edition by Goff Hill

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Part 2

Transmission Media

This part discusses the transmission media that are used in core telecommunications networks. Before 1980 the predominant transmission medium was copper cables (either copper pairs or coaxial cables). A smaller proportion of systems were carried over radio channels. However, since the advent of commercial optical fiber transmission systems in 1980, copper cables for transmission have been displaced either to the edges of the network or to connections within or between equipment. They are therefore not covered in this volume.

Microwave systems, on the other hand, are still widely used, although the proportion of traffic they carry in core networks is small compared to fiber systems. The basic principles of radio propagation ...

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