A bit of wet string
We learned in Chapter 4 how regional and core networks enable long-distance telephone calls to be set up between different parts of the country. Transmission systems provide the trunks that carry these calls from one telephone exchange to the next. In popular mythology, this part of the network is often characterized as being little more than a bit of wet string, but it is actually an area in which some very sophisticated technology can be found. This chapter considers how these links have evolved from wires carrying a single telephone call into fiber optic cables carrying voice, data and video traffic in mind-boggling quantities.
KeywordsOptical Fiber Radio Wave Communication Satellite Coaxial Cable Optical Amplifier
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