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Resilient data communications system

  • US 4,879,716 A
  • Filed: 12/23/1987
  • Issued: 11/07/1989
  • Est. Priority Date: 12/23/1987
  • Status: Expired due to Term
First Claim
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1. A resilient data communications system for transferring information between a subscriber and a communication network, the data communications system comprising:

  • a. terminal means;

    b. relay switching means;

    c. a plurality of conversion means;

    d. a bus means;

    e. a plurality of network processor means;

    f. a computer means; and

    g. control module means,wherein in the data communications system;

    a. the terminal means is connected to the relay switching means;

    b. the relay switching means is connected between the terminal means and the plurality of conversion means;

    c. the plurality of conversion means is connected between the relay switching means and the bus means;

    d. the bus means is connected between the plurality of conversion means and the plurality of network processor means;

    e. the plurality of network processor means is connected between the bus means and the computer means, and there is also a connection from the plurality of network processor means to said communication network;

    f. the computer means is connected between the plurality of network processor means and said communication network; and

    g. the control module means is connected between the plurality of network processor means and a control input of the relay switching meansand wherein further in the data communications system;

    a. the terminal means is for passing serial digital data bidirectionally between the relay switching means and a subscriber operating a keyboard and viewing a display;

    b. the relay switching means is adapted to select one certain of the plurality of conversion means in response to a signal at its input from the control module means and to pass serial digital data bidirectionally between the terminal means and the one certain of the conversion means;

    c. the conversion means is adapted to convert data bidirectionally between serial digital data and parallel data bytes, to transmit parallel data bytes bidirectionally to or from the bus means, and to transmit serial digital data bidirectionally to or from the relay switching means;

    d. the plurality of network processor means is adapted to convert data bidirectionally between parallel data bytes and serial digital data, to transmit parallel data bytes bidirectionally to or from the bus means, and responsive to the computer means to transmit serial digital data bidirectionally to or from the computer means; and

    e. the computer means is adapted to transmit serial data bidirectionally from or to the communications network responsive to control signals thereon, and to send control signals to the plurality of network processor means,and wherein further the plurality of network processor means is adapted to detect, responsive to signals from the computer means, that the computer means has ceased to function and to thereupon request, via its connection to said communications network, control signals from the computer means of a different resilient communications systems, and the computer means is adapted to receive via said communications network requests for control signals from the network processor means of a different communications system and to provide such control signals via said communications network,whereby if at least two resilient communications systems are connected to a communications network, functionality of both may be maintained despite failure of the computer means of one of them.

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