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Essential Guide to Computing: The Story of Information Technology, The by E. Garrison Walters

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Media

Communications media fall into two categories, wireless and wired, with a fair number of iterations in each.

Wireless

The various frequency bands used for wireless transmission belong to what is known as the electromagnetic spectrum. This topic, together with descriptions of how waves carry information, is covered in Chapter 10.

Radio

Radio waves, roughly 1 KHz to 1 GHz in the frequency spectrum, carry radio, television, cellular telephone calls, and communications from ships, planes, drug dealers, cops, good buddies, garage door openers, and lots more. Altogether, a heck of a lot of stuff is carried by radio waves. Still, relatively little of that is data. The problem with using radio frequencies for data is that this is both a very crowded ...

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