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    • 11. 发明授权
    • Digital radiotelephone system
    • 数字无线电话系统
    • US5572531A
    • 1996-11-05
    • US399485
    • 1995-03-07
    • Koji NittaYuji Sumi
    • Koji NittaYuji Sumi
    • H04M1/72H04M1/725H04W84/16H04Q7/30
    • H04W84/16H04M1/72505
    • A digital radio telephone system for establishing communications between a main unit and a sub unit and between a plurality sub units. The system includes a main unit and a plurality of sub units. In order to establish communications with a sub unit, a calling signal including the sub unit extension number is first sent through the main unit to the sub unit. If the sub unit corresponding to an extension number in the calling signal is available, a calling acceptable signal is transmitted by the sub unit. The main unit includes an extension number multiplexer which multiplexes a plurality of sub unit extension numbers into one calling signal. Therefore, a calling signal from the main unit and calling signals from a plurality of sub units are multiplexed (combined) into a single calling signal. The main unit need only transmit a single multiplexed calling signal instead of a plurality of individual calling signals to each sub unit.
    • 一种用于在主单元和子单元之间以及在多个子单元之间建立通信的数字无线电话系统。 该系统包括主单元和多个子单元。 为了与子单元建立通信,首先通过主单元将包括子单元分机号码的呼叫信号发送到子单元。 如果与呼叫信号中的分机号相对应的子单元可用,则子单元发送呼叫可接受信号。 主单元包括分机号多路复用器,其将多个子单元分机号码复用为一个呼叫信号。 因此,来自主单元的呼叫信号和来自多个子单元的呼叫信号被多路复用(组合)成单个呼叫信号。 主单元仅需要发送单个多路复用呼叫信号而不是将多个单独呼叫信号发送到每个子单元。