Automatic switching system

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In data communications, an automatic switching system is a in which all the operations required to execute the three phases of Information transfer transactions are automatically executed in response to signals from a user end-instrument.

In an automatic switching system, the information-transfer transaction is performed without human intervention, except for initiation of the and the by a user.

In telephony, it refers to a telephone exchange in which all the operations required to set up, supervise, and release connections required for telephone calls are automatically performed in response to signals from a calling device. This distinction lost importance as manual switching declined during the 20th century.