In the world of modern digital telecommunications, high speeds of exchange switching and transmission along bundles of hair-thick optical fibres, and the compression of microwave signals from base-stations and satellites, have replaced thick cables and wide spectrums of high-frequency radio-waves. This is important because it drives up the volumes of traffic the network can carry, and drives down the unit costs, and sometimes the absolute costs, of carrying it.
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Photo by Brian Cheng
