Awork of this magnitude is not a simple matter. It is the culmination of more than 35 years’ combined experience in telecommunications and incorporates knowledge drawn from thousands of articles and Web sites and hundreds of books. Most of those sources are very recent, but some of the books are more than 100 years old and still relevant for context, if not for their descriptions of contemporary cutting- edge thanks to all those authors who went before me and variously put ink to paper or fingers to a keyboard
