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    • 4. 发明专利
    • INFORMATION TERMINAL UNIT WITH AUTOMATIC LINE DISCONNECTING FUNCTION
    • JPS5625867A
    • 1981-03-12
    • JP10127979
    • 1979-08-10
    • HITACHI LTDNIPPON TELEGRAPH & TELEPHONE
    • TAKEZAWA TERUHIROHIRAHATA SHIGERUSATOU KIYOMIISHIKAWA ISAO
    • H04M11/00H04M11/06
    • PURPOSE:To automatically return the line connection to the telephone set side, when the information is not incoming or the power supply at the terminal is disconnected, by providing the carrier detection circuit detecting the incoming of the information to the information terminal unit and the circuit discriminating the disconnection of the power supply. CONSTITUTION:The reception and giving of information between the line l and the telephone set 2 or information terminal is made with the line control section 1 of the line disconnection function information terminal unit to control the connection between the telephone set 2 or information terminal and the line l. At the secondary side of the hybrid transformer 13 connected to the lines L3, L4 at the information terminal side of the control section 1, the carrier detection circuit 16 detecting the presence of the information at the information terminal is connected. Further, the input terminals L7, L8 supplying the power supply to the line control section 1 is provided with the current detection transistor 12 detecting the flowing of the current in the signal line 100. Further, when the fact that there is no incoming of information to the circuit 16 or the disconnection of power supply is detected, the line l can automatically be returned to the telephone set 2 with the self-hold relay 7.
    • 9. 发明专利
    • JPH0644787B2
    • 1994-06-08
    • JP2180684
    • 1984-02-10
    • HITACHI LTDNIPPON TELEGRAPH & TELEPHONE
    • SHIBANO SHIYOUGOISHIKAWA ISAO
    • H04M3/44H04M3/54
    • PURPOSE:To attain transfer and registration of an incoming call from a remote place through any telephone all over Japan by providing a transfer/registration register to an automatic telephone exchange to attain an optional incoming all through an ordinary telephone. CONSTITUTION:When an incoming call transfer service subscriber dials the telephone number of an incoming call transfer/registration register ASRE from an outside telephone TEL, the exchange control is started with the ASRE number. Then the ASRE receives an incoming call through an incoming trunk ICT. The service subscriber dials both the incoming call transfer/registration number and a secret number after confirming the ASRE incoming call. Receiving these numbers, the register ASRE starts an incoming call transfer/registration action. The incoming call transfer/registration is carried out by the telephone number which is dialed by the service subscriber through the telephone TEL.