| 摘要 |
PURPOSE:To perform automatically data transmission through a specific communication circuit and two public communication circuits by providing an automatic communication control part which control a network controller of a public telephone circuit at a transmission destination of data through the specific communication circuit. CONSTITUTION:Automatic incoming control parts 16 and 17 function to accept telephone numbers sent out of data terminal devices 1 and 15, to originate automatically by controlling the network controllers 11 and 15 through the automatic incoming control parts 17 and 16, to inform the data terminal devices 1 and 15 of the data terminal devices 15 and 1 are busy when so, and to release public communication circuits by the indication from the data terminal devices 1 and 15 and further report that to the automatic incoming control parts 17 and 16. For example, the data terminal device 1, therefore, makes a circuit connection with the data terminal 15 only by dialing its number. |
