Peter Hugill, Global Communications since 1844 (1999)
Attentuation (weakening of signal over longer lines)
Switching
Transmission
Batteries
Telephony was first an urban phenomenon.
Europe: state owns all PTTs [= Post, Telegraph, Telephones]
USA: different organisations operate PTTs
Showing posts with label attenuation. Show all posts
Showing posts with label attenuation. Show all posts
May 13, 2010
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