| 摘要 |
PURPOSE:To make an information transmission system automatic by providing a sharing unit for sharing a telephone line with a telephone set and a terminal equipment. CONSTITUTION:During the time when the communication to the center is permitted for terminal equipment 7, T relay 21 of sharing unit 4 is operated. Consequently, incoming detection circuit 23 is connected through contacts t1 and t2 and operates on a basis of call signals from the center. As a result, not only tape recorder 25 is connected but also H relay 27 of incoming holding circuit 26 is operated, thus forming a DC loop for the station. When the center is originating, center discrimiation signal detector 31 and center call display circuit 32 are operated, and simultaneously, terminal equipment 7 is connected to transmit information. In case of the incoming from a third party, it is displayed by buzzer 37, however, the verbal message is recorded on tape recorder 25 when answering is impossible because of absence. |
