Power source control system for data terminal equipment.

摘要

A power source control system is disclosed for a data terminal (4) which is connected to a communication line (l) through a modem (3) and a network control unit (2). A power source control unit is provided between the modem (3) and the data terminal (4) while interface between the modem (3) and the data terminal (4) is maintained so that when an incoming call to the data terminal is received and detected, a line establishing procedure is immediately executed with respect to the calling party in place of the data terminal (4), and a main power source of the data terminal is turned ON, making the data terminal (4) ready for a communication operation.