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    • 4. 发明授权
    • Emergency communications system
    • 应急通信系统
    • US3939417A
    • 1976-02-17
    • US425908
    • 1973-12-18
    • Gary A. CannalteRichard J. CrouseRichard D. KoenigThomas J. RollinsDonald L. Walker
    • Gary A. CannalteRichard J. CrouseRichard D. KoenigThomas J. RollinsDonald L. Walker
    • H04B1/56H04B7/155H04B7/14H04B1/40
    • H04B1/56
    • A control console including a transceiver, a plurality of terminal stations positioned at spaced apart locations remote from the console and each including a transceiver connected to the console by RF or a wire line, and a plurality of call boxes positioned at spaced apart locations adjacent to each terminal station and including a transceiver in communication with the terminal station. When the hand set of a call box is lifted from the cradle a tone is transmitted through the adjacent terminal station to the console which then keys on all terminal station transmitters to indicate a busy line at other call boxes and to provide a ringing signal at the call box being used. Subsequent to transmission of the tone, a signal indicative of the address of the box and the condition of predetermined portions of the box is automatically transmitted to the console. When the console operator answers, full duplex communication is provided between the call box and the console.
    • 控制台包括收发器,位于远离控制台的间隔开的位置的多个终端站,并且每个终端站包括通过RF或有线线路连接到控制台的收发器,以及定位在相邻的间隔开的位置处的多个呼叫箱 每个终端站并且包括与终端站通信的收发器。 当一个呼叫箱的手机从支架上提起时,一个音调通过相邻的终端站发送到控制台,控制台然后在所有的终端站发射机上键入,以指示在其他呼叫方框中的忙线,并提供一个振铃信号 使用电话箱。 在发送音调之后,指示盒的地址的信号和盒的预定部分的状态被自动发送到控制台。 当控制台操作员回答时,在通话盒和控制台之间提供全双工通信。