Subscriber loop range extender
    3.
    发明授权
    Subscriber loop range extender 失效
    订户循环范围扩展

    公开(公告)号:US3671676A

    公开(公告)日:1972-06-20

    申请号:US3671676D

    申请日:1969-12-17

    CPC classification number: H04M19/006

    Abstract: This disclosure describes a telephone subscriber loop range extender having a signaling mode and a transmission mode. In the former, a resistive shunt is applied across the loop with each dial pulse to aid operation of the pulsing relay for an originating cell. For a terminating call, the shunt is applied upon answer, either during ringing or during the silent interval, to aid operation of the ring-trip relay. In the transmission mode, voice frequency gain and greater transmitter voltage are applied to the loop. A control circuit consisting of logic, timing and relay driving circuits, acts upon loop voltage and current data to control shunt action and mode selection.

    Abstract translation: 本公开描述了具有信令模式和传输模式的电话用户环路扩展器。 在前者中,每个拨号脉冲在环路上施加电阻分流器,以帮助起始电池的脉冲继电器的操作。 对于终止呼叫,在应答时应用分路,无论是在振铃期间还是在静音间隔期间,都可以应用分流来帮助环路继电器的操作。 在传输模式下,语音频率增益和更大的发射机电压被施加到环路。 由逻辑,定时和继电器驱动电路组成的控制电路作用于环路电压和电流数据,以控制分流动作和模式选择。

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