how an analog phone line works

Discussion in 'General Electronics Chat' started by tuanvoi, Nov 7, 2008.

  1. tuanvoi

    Thread Starter Active Member

    Oct 31, 2008
    56
    0
    Does anybody know or have a good resource that relates to "how an analog phone line works" (graphs, circuits...)? Thank you so much!
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Google "plain old telephone service". I don't think there is much mystery inherent in sending an analog signal down a wire, though. Bell Labs work on switchgear and such was quite important in developing modern communications theory.
     
  3. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
  4. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    If you want a book the

    Telephone Installation Handbook

    by Sterve Roberts and published by Newnes

    has good information.

    Earlier editions can be had very cheaply and contain all you rrequire.
     
  5. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287

    Actually, you'd be amazed at what they accomplished even on the analog level. Concepts of multilayer phantom circuits (phantoms of phantoms!), bidirectional (hybrid) amplifiers, line loading, time domain reflectometry......all stuff they knew about before the 1920s! Fascinating and, in my opinion, REQUIRED, reading for any electronics technician.

    eric
     
  6. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287

    Oh, yes...I forgot....in 1928, they had a system of time division multiplexing using MECHANICAL commutators! It was actually deployed in parts of New York.

    eric
     
Loading...