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1), but how is this process performed?
In early telephone networks, call completion was dependent on an operator to complete the calls. When you wanted to place a call you would pick up the receiver and be connected to an operator at the Central Office (CO). The CO is the local telephone office which all local lines connect too and where circuit switching of subscriber lines occurs. The operator would determine which two lines need to be connected for the parties to talk and connect the lines. To connect the two lines the operator would plug a cord connecting the two ports on a cord board to bridge the two ports together...
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