How Does the Telephone System Work? North American Numbering Plan, explained by AT&T Routing Calls through the Network, from BrainSpin at AT&T Labs Glossary of communication and networking terms, from Lucent Technologies Bell Canada's Guide to Inside Wire How Telephones Work from How Stuff Works
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"http://www.physics.udel.edu/~watson/scen103/less-phone.html" Phone cord from NYTimes, 12/11/96 Ringing phone from AT&T Labs Last updated March 1, 1999. Copyright George Watson, Univ. of Delaware, 1996.