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The Telegraph-Telephone Frequency-Division Multiplex Transmission Engineers

  • John Bray

Abstract

Just as the growth of telegraph traffic and the pressure of economic factors led the early telegraph engineers to develop duplex and quadruplex telegraph systems capable of transmitting two or four messages simultaneously on a single wire, so the growth of intercity telephone communication created demands for providing ever more telephone channels on a pair of wires or a single coaxial cable. This was paralleled by the need similarly to provide more than just two or four telegraph channels on a single transmission path.

Keywords

Pass Range Carrier Wave Nonlinear Device Western Electric Wave Filter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    A History of Engineering and Science in the Bell System: The Early Years (1875–1925) (Bell Telephone Laboratories, 1975), p. 277 et seq.Google Scholar
  2. 2.
    John Stone Stone, “The Practical Aspects of the Propagation of High-Fre-quency Electric Waves along Wires/’ Journal of the Franklin Institute, October 1912.Google Scholar
  3. 3.
    J. R. Carson, Electric Circuit Theory and Operational Calculus ( McGraw-Hill, New York, 1926 ).Google Scholar
  4. 4.
    T. E. Shea, Transmission Networks and Wave Filters (Bell Telephone Laboratories, 1929 ).Google Scholar

Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • John Bray

There are no affiliations available

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