Phone

Plain old telephone system

By Sammyanguiano
  • Manual Operator

    Manual Operator

    Manual operation.
    Human control.
    Space/analog switching method.
    Plug/cord/jack network.
  • Step-by-step

    Step-by-step

    Electromechanical operation.
    Space/analog switching method.
    Control distributed stage by stage.
    stepping switch train network.
  • Crossbar

    Crossbar

    Electromechanical operation.
    Space/analog switching method.
    Common control.
    X-bar switching network.
  • Lucent ESS - First Generation

    Lucent ESS - First Generation

    Semielectronic operation.
    Space/analog switching method.
    Common control.
    Reed switch network.
  • Lucent ESS - Second Generation

    Lucent ESS - Second Generation

    Semielectronic operation.
    Space/analog switching method.
    Stored program control.
    Reed switch network.
  • Lucent ESS - Third Generation

    Lucent ESS - Third Generation

    Electronic operation.
    Time/digital switching method.
    Stored program common control.
    Pulse code modulation network.

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