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AT&T Long Lines almost went digital in 1947?

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  • Albert LaFrance
    The Nov. 1947 Bell Laboratories Record contains an article titled A Preview of Radio Relaying , describing the experimental microwave link between the Labs
    Message 1 of 1 , Jan 4, 2004
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      The Nov. 1947 Bell Laboratories Record contains an article titled "A Preview
      of Radio Relaying", describing the experimental microwave link between the
      Labs locations in Murray Hill, NJ and West St. in New York City. The link
      is described as "a sort of 'bread-board' model" for the Boston-NYC system,
      which went into service that month.

      I'll be posting the entire article, but I wanted to call attention to the
      last paragraph because it suggests that AT&T planned to use digital
      transmission in its first broadband microwave system:

      "Tests intended to evaluate possible methods of transmitting multiplex voice
      signals were started this year. To date the most comprehensive tests have
      been made with a new type of pulse signaling called pulse code modulation.
      For these experiments, the New York terminal was converted to a repeater
      station and the Murray Hill equipment connected by coaxial lines to a
      skeletonized 96-channel PCM terminal in a laboratory room at Murray Hill.
      The New York-Murray Hill system provides a convenient facility for
      evaluating these and other possibilities in the transmission of multiplex
      voice signals. The results will be directly applicable to the system
      between New York and Boston as well as to future systems of the same general
      type."

      Albert
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