| 摘要 |
PURPOSE:To perform efficient operation with a simple constitution, by concentrating the function to control a plurality of subscriber circuits to the specific terminal low in usage frequency such as public telephone at the trunk side, and commonly using the unit. CONSTITUTION:To the network 8 not flowing DC, the conventional subscriber circuit 5 and conventional telephone trunk circuit 7 are connected. Further, the subscriber circuit for public telephone 4 provides the audio/data signal terminal 40 connected to the network 8 corresponding to the specific terminal and the control signal terminal, and the control signal terminal connected to the processor 1, and the specific terminal provides the trunk circuit 6 commonly usable. Further, the circuits 4 and 6 are connected each other, by independently setting the bus for the audio/ data signal and the bus 12' for control signal. Thus, efficient operation can be made with as simple constitution. |
