AUTOMATIC SWITCHING SYSTEM

1. In data communications , a switching system 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. Note: In an automatic switching system, the information-transfer transaction is performed without human intervention, except for initiation of the access phase and the disengagement phase by a user. 2. In telephony , a system in which all the operations required to set up, supervise, and release connections required for calls are automatically performed in response to signals from a calling device. ( 188 )