| 摘要 |
PURPOSE:To avoid the confusion of connection and to perform the assured communication control, by adding a signal to discriminate a radio link or a wire link to a base station to the control signal which is transmitted to a fixed station from a mobile station. CONSTITUTION:The calling is given to a fixed station 21 from a mobile station 41 by means of an ascending frequency f2. When this calling is received at a base station 1, the radio connection is decided for a control circuit 15. Then the output of a signal transmitter 13 is relayed via an attenuator 50 and with a descending frequency f2. A ringing tone is given to the station 21 among the fixed stations 21 and 22 that received the frequency f2 based on the group designation and a station designating code, and a call is carried out between the stations 21 and 41. When the calling is given to a fixed station 32 from a mobile station 42 with the wire connection, the outputs of the signal receiver 12 and transmitter 13 are connected to the hybrid 55 according to the identification number. Then the hybrid 55 is connected to a wire communication line 62 reaching the station 32 and selected by the group and station identifications. As a result, a call of simultaneous transmission/reception is possible between the stations 42 and 32. |
