Circuit switched data is a data communication method that maintains a dedicated communications path between two communication devices regardless of the amount of data that is sent between the devices. This gives to communications equipment the exclusive use of the circuit that connects them, even when the circuit is momentarily idle.

The original telephone service consisted of two phones in two separate locations connected by a single line. To call multiple locations required multiple phone lines. Cities across America began to be covered with a network of unsightly telephone wires. After the switchboard was invented, a person could call any other phone using a single telephone line.

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