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公开(公告)号：US4401847A
公开(公告)日：1983-08-30
申请号：US173622
申请日：1980-07-30
摘要： A multi-wire telephone system which facilitates voice and data communication between any two telephones connected to each other with one of a plurality of standard shielded twisted-pair cables. The telephones, which are battery-powered, feature standard telephone operation without a central switching and control station or PBX. Each telephone is provided with a microprocessor which can generate and decode all signals necessary to establish communication with any other telephone in the system. Since a PBX is not required, a break in any phone line will result in two systems operating independently of each other although somewhat degraded performance can be expected, depending upon the nature of the break. Whenever communication is established between two stations in the system, a direct current bias is impressed on the cable interconnecting those stations such that all other stations in the system can determine that that particular cable is in use and can select another cable for communication. Communication is initially established between stations with the use of frequency shift keyed signals sent from one station and retransmitted from the called station before voice communication is established. The telephone system has both private and page communication capabilities and can transmit data in the form of pulsed signals as well as voice signals. The system incorporates a main dispatcher station which can interrupt any private communication in emergency situations and for data transmission.
摘要翻译： 一种多线电话系统，其利用多个标准屏蔽双绞线之一彼此连接的任何两个电话之间的语音和数据通信。 电池供电的电话在没有中央交换和控制站或集团电话的情况下进行标准电话操作。 每个电话设置有微处理器，其可以生成和解码与系统中的任何其他电话建立通信所需的所有信号。 由于不需要集团电话，所以任何电话线路的中断将导致两个系统彼此独立运行，尽管根据中断的性质可以预期性能有所降低。 无论何时在系统中的两个站之间建立通信，在互连这些站的电缆上施加直流偏置，使得系统中的所有其他站可以确定该特定电缆正在使用并且可以选择另一电缆进行通信。 使用从一个站发送的频移键控信号，在语音通信建立之前，从呼叫站重新发送，首先在站间建立通信。 电话系统具有私有和页面通信功能，并且可以以脉冲信号和语音信号的形式传输数据。 该系统包含一个主调度台，可以在紧急情况下中断任何私人通信并进行数据传输。
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