| 摘要 |
PURPOSE:To eliminate the need for a connection cable between a telephone set and a subscriber circuit and to avoid a trouble by the use of the connection cable by devising the connection system such that the connection between plural telephone terminal sets (telephone sets) and subscriber circuits of time division private branch of exchanges (PBX) corresponding to respective telephone sets is implemented in a radio wave. CONSTITUTION:No connection cable is used between a telephone set and a subscriber circuit, the telephone set is fed by a power supply section 1, an identification code is given by an identification code provision means 8 to a speech signal from the telephone set, a radio section 2 having the 1st carrier FA sends the carrier, a code generation and decoding section 4 encodes a control signal for the exchange procedure respectively, an identification code provision means 8 gives an identification code and a radio section 6 having the 3rd carrier FC sends the result. A radio section 3 receives a speech signal in the carrier FA in the subscriber circuit, a radio section 7 receives the control signal in the carrier FC and an identification code discrimination means 11 fetches the signal when it discriminates the code to be the identification code of a corresponding telephone set. Moreover, the content of the encoded control signal is decoded by the code generation decoding section 5 and the signal is given to a PBX. The speech signal and the control signal from the subscriber to the telephone set are processed similarly. |
