Just remember, the nation's telephone system was not designed, it evolved. Therefore, there are no absolutes. There probably still are Strowger switches around (Lord knows, maybe even a Panel Office) and some chicken farms out of Tonopah NV, may still be served on barbed wire and ground. What you won't read much about in the recommended literature is the impairments introduced by building wiring. As more buildings are being wired by contractors who had the lowest bid, you'll find more large residential buildings (especially) that have bel wire for communications. Try and run a high speed data service over it to the typical work-from-home user.
Ciao, Vic Ciao, Vic
