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13 条记录 (耗时 0.01 秒)

    Subscriber line interface circuit
    4.
    发明公开
    Subscriber line interface circuit 失效
    Teilnehmerschnittstellenschaltung。

    公开(公告)号：EP0212632A2

    公开(公告)日：1987-03-04

    申请号：EP86111530.1

    申请日：1986-08-20

    申请人： FUJITSU LIMITED

    发明人： Takato, Kenji ,  Tojo, Toshiro ,  Iketani, Yozo ,  Ayano, Mitsutoshi ,  Shibuya, Kiyoshi

    IPC分类号： H04M19/00

    CPC分类号： H04M19/005

    摘要： A balanced type subscriber line interface circuit (SILC) is ideally to be fabricated as a monolithic IC. A battery feed circuit (300) comprises three pairs of mirror circuits (A0, B0, A1, B1, A2, B2) to eliminate the longitudinal noise and noise induced in the voltage source. Overcurrent protection is done by varying a mirror ratio of current feeding mirror circuits (A0, B0, A1, B1) when the subscriber line current exceeds a threshold value. A 2- to 4-wire converter (400) is compensated in its frequency characteristics by feeding back a current with an impedance network composed of two impedance elements each having respectively an impedance N time as high as that of the load impedance Zo and the termination impedance Z. The supervising circuit (500) provides scan signals detecting the currents running through the sub­scriber lines. The circuit is provided with a ground separation circuits (600) to separate the grounds of high voltage source and low voltage source.

    摘要翻译： 平衡型用户线接口电路（SILC）理想地被制造为单片IC。 电池馈电电路（300）包括三对镜电路（A0，B0，A1，B1，A2，B2），以消除在电压源中感应的纵向噪声和噪声。 当用户线电流超过阈值时，通过改变电流馈电镜电路（A0，B0，A1，B1）的镜像比来实现过电流保护。 2到4线转换器（400）的频率特性通过用两个阻抗元件组成的阻抗网络反馈电流来补偿，每个阻抗元件分别具有与负载阻抗Zo相同的阻抗N时间，并且终端 阻抗Z.监控电路（500）提供检测通过用户线路流动的电流的扫描信号。 该电路设置有分离高压源和低电压源的接地的接地分离电路（600）。

    Feed circuit in exchanger
    6.
    发明公开
    Feed circuit in exchanger 失效
    交换机进线电路

    公开(公告)号：EP0446944A3

    公开(公告)日：1991-12-27

    申请号：EP91104033.5

    申请日：1991-03-15

    申请人： FUJITSU LIMITED

    发明人： Itoh, Shinichi ,  Ayano, Mitsutoshi

    IPC分类号： H04M19/00

    CPC分类号： H04M19/005 ,  H04M19/001

    摘要： A feed circuit (11, 13) in an exchanger supplies DC power to a subscriber line. The DC power is monitored and feedback-controlled so that the DC power can be automatically adjusted. Therefore, the feed circuit can satisfy various user's needs.

    Feed circuit in exchanger
    7.
    发明公开
    Feed circuit in exchanger 失效
    SpeilschaltungfürFernmeldevermittlungsanlage。

    公开(公告)号：EP0446944A2

    公开(公告)日：1991-09-18

    申请号：EP91104033.5

    申请日：1991-03-15

    申请人： FUJITSU LIMITED

    发明人： Itoh, Shinichi ,  Ayano, Mitsutoshi

    IPC分类号： H04M19/00

    CPC分类号： H04M19/005 ,  H04M19/001

    摘要： A feed circuit (11, 13) in an exchanger supplies DC power to a subscriber line. The DC power is monitored and feedback-controlled so that the DC power can be automatically adjusted. Therefore, the feed circuit can satisfy various user's needs.

    摘要翻译： 交换机中的馈电电路（11,13）向用户线路提供直流电力。 直流电源被监控并进行反馈控制，以便直流电源可以自动调节。 因此，馈电电路可以满足用户的各种需求。

    Calling signal transmission apparatus
    9.
    发明公开
    Calling signal transmission apparatus 失效
    呼叫信号传输装置

    公开(公告)号：EP0165516A3

    公开(公告)日：1988-06-01

    申请号：EP85106674

    申请日：1985-05-30

    申请人： FUJITSU LIMITED

    发明人： Takato, Kenji ,  Nojiri, Shoji ,  Iijima, Yoshimi ,  Ogawa, Kenichi ,  Miyazaki, Yasuo FUJITSU Dai 5 Ichiga-ryo ,  Ayano, Mitsutoshi ,  Shibuya, Kiyoshi ,  Serikawa, Atsuo

    IPC分类号： H04M19/02

    CPC分类号： H04M19/026

    摘要： Calling signal transmitting apparatus comprising a ring trip detecting circuit (14) for detecting a ring trip signal in response to an off-hook operation of the telephone set (T) during a signal state of an intermittent ringing signal, a loop detecting circuit (13) for detecting a loop signal in response to an off-hook operation of the telephone set (T) during a nonsignal state of the intermittent ringing signal, a logical OR gate circuit (18), for providing, as a status signal, a logical sum of the ring trip signal and the loop signal, and a supervising circuit (8) for supervising the status signal, wherein, under a state when an incoming call is being received by the telephone set (T), when the supervising circuit (8) detects an off-hook state in the status signal, the supervising circuit (8) stops the transmission of a ringing signal to the telephone set (T), and carries out a second supervising operation for supervising the status signal, and, if an on-hook state is detected during the second supervising operation, said supervising circuit (8) again transfers the ringing signal to the telephone set (T).