| 摘要 |
PURPOSE:To call individually a branch telephone set by providing a multi-frequency signal reception means receiving a branch telephone set identification number by a multi-frequency signal for pushbutton dial transmitted from a calling telephone set. CONSTITUTION:A connection circuit 12 of a calling signal set 51 of a push-button telephone set 5 and a brake contact rr7 of an RR relay 6 are provided and telephone set terminals L1, L2 are connected to an exchange 4 via a telephone line, and connected in parallel with other branch telephone sets near the telephone set 5. Moreover, a multi-frequency signal receiver (REC) 10 is connected to the terminals L1, L2 via a make contact hr11 of an HR relay 9. Since the REC10 is connected to the telephone line when all branch telephone sets hook on, the REC10 receives a branch telephone set identification number transmitted from the calling telephone set at first at the incoming and controls whether or nor a current is given to the 1st winding of the RR relay 6 accordingly. |
