Digital network access server

  • US 5,912,888 A
  • Filed: 08/27/1997
  • Issued: 06/15/1999
  • Est. Priority Date: 06/09/1994
  • Status: Expired due to Term
First Claim
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1. In a system comprising a multiplexed digital telephone line carrying a digital first telephone signal resulting from modulation of a first digital computer signal representing digital first data from a digital first computer, said telephone line also carrying a digital second telephone signal resulting from modulation of a second digital computer signal representing digital second data from a digital second computer, said system also comprising a network for receiving a digital first network signal comprising blocks of digital signals representing digital third data from a digital third computer and for receiving a digital second network signal comprising blocks of digital signals representing digital fourth data from a digital fourth computer, improved communication apparatus for enabling bilateral transmission of said digital data between said digital telephone line and said network, comprising in combination:

  • a telephone control interface responsive to said first telephone signal generating a digital first telephone bus signal representing said first data and responsive to said second telephone signal generating a digital second telephone bus signal representing said second data;

    a network control interface responsive to said first network signal generating a digital first network bus signal representing said third data and responsive to said second network signal for generating a digital second network bus signal representing said fourth data;

    a first modem responsive to said telephone control interface and said network control interface modulating said first network bus signal to form a digital third telephone bus signal representing said third data and demodulating said first telephone bus signal to form a digital third network bus signal representing said first data;

    said first modem modulating said first network bus signal to form said digital third telephone signal representing said third data without conversion of said third data to an analog telephone signal;

    a second modem responsive to said telephone control interface and said network control interface for modulating said second network bus signal to form a digital fourth telephone bus signal representing said fourth data and for demodulating said second telephone bus signal to form a digital fourth network bus signal representing said second data;

    said second modem modulating said second network bus signal to form said digital fourth telephone bus signal representing said fourth data without conversion of said fourth data to an analog telephone signal;

    a telephone bus responsive to said telephone control interface for transmitting said first and third telephone bus signals between said telephone control interface and said first modem and for transmitting said second and fourth telephone bus signal between said telephone control interface and said second modem; and

    a network parallel bus responsive to said network control interface transmitting said first and third network bus signal between said network control interface and said first modem and transmitting said second and fourth network bus signals between said network control interface and said second modem;

    whereby said first and third computers bilaterally communicate via said telephone line while said second and fourth computers bilaterally communicate via said telephone line.

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