Towel rack
    141.
    外观设计
    Towel rack 失效
    毛巾架

    公开(公告)号:USD450947S1

    公开(公告)日:2001-11-27

    申请号:US29140522

    申请日:2001-04-19

    Applicant: David Walker

    Designer: David Walker

    Electrical power and telephone ringer signal distribution system
    145.
    发明授权
    Electrical power and telephone ringer signal distribution system 失效
    电力和电话铃声信号分配系统

    公开(公告)号:US5682423A

    公开(公告)日:1997-10-28

    申请号:US654185

    申请日:1996-05-28

    Applicant: David Walker

    Inventor: David Walker

    CPC classification number: H04M19/08 H04M19/00

    Abstract: A telephony system includes a plurality of local network terminations connected to a street cabinet in turn connected to an exchange. The street cabinet has a power supply for supplying voltage, a clock for generating a master ringer signal, and a modulator for modulating the voltage with the ringer signal. The filters extract the DC voltage and the ringer signal. The extracted DC voltage and the extracted ringer signal obviate the prior art requirements to provide a separate DC power supply and a separate clock within each local network termination, thereby avoiding duplication of components within each local network termination.

    Abstract translation: 电话系统包括连接到街柜的多个本地网络终端,其又连接到交换机。 街道柜具有用于提供电压的电源,用于产生主振铃信号的时钟,以及用振铃信号调制电压的调制器。 滤波器提取直流电压和振铃信号。 提取的直流电压和提取的振铃器信号消除了现有技术的要求,以在每个本地网络终端内提供单独的直流电源和单独的时钟,从而避免了每个本地网络终端内的组件的重复。

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