| 摘要 |
PURPOSE:To connect control information of transmission button to a simplex communication line trunk without passing through any link by adding function storing information to which simplex communication line is connected at each talking device. CONSTITUTION:When a talking device 6 is connected to a simplex communication line trunk 10, the talking device 6 and the simplex communication line trunk 10 constitute a channel via a talking link 81. In this case, a relay 61A provided in the talking device 6 is actuated and it is stored that the device is under connection with a line corresponding to the simplex communication line trunk 10. The operation of the relay causes the contact 61 to be closed. In depressing a transmission button 6a, a transmission button information reception relay 10b in the simplex communication line trunk 10 is actuated through the contact 61, its contact 10c is closed and earth information is transmitted to a simplex communication equipment 9 as a transmission signal. Further, the talking device 6 is connected to the simplex communication line trunk 10 and it is possible to be connected to a simplex communication line trunk 20 or 30 by operating a switch for other simplex communication line trunk. |
