| 摘要 |
PURPOSE:To prevent a telephone system from damage due to anonymity by incorporating a circuit receiving a calling subscriber and a circuit displaying the calling subscriber's number in a telephone equipment to be used for an exchange system having a calling subscriber's number informing function transmitting the calling subscriber's number to the called subscriber's side, prior to a calling signal. CONSTITUTION:An input terminal of a calling subscriber's number receiving circuit 35 is connected to a subscriber's line 30 through a hook switch 40 and a coupling capacitor 41. The switch 40 is a contact interlocked with a hook switch in a transmitting/receiving circuit 32 and the subscriber's line is also connected to the circuit 35 through the capacitor 41 under the state that a hand set 33 is hooked. When the calling subscriber's number is sent under said status prior to a signal called from exchange equipment, the calling signal is received by the circuit 35 and demodulated. When the calling subscriber's number is received by the circuit 35, the number information is transmitted to a microcomputer 36 and the number is displayed on a display device 38. |
