Modem input/output signal processing techniques
First Claim
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 apparatus for enabling bilateral transmission of said digital data between said digital telephone line and said network comprising in combination:
- telephone control means responsive to said first telephone signal for generating a digital first telephone bus signal representing said first data and responsive to said second telephone signal for generating a digital second telephone bus signal representing said second data;
network control means responsive to said first network signal for 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;
first modem means responsive to said telephone control means and said network control means for modulating said first network bus signal to form a digital third telephone bus signal representing said third data and for demodulating said first telephone bus signal to form a digital third network bus signal representing said first data;
second modem means responsive to said telephone control means and said network control means 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;
telephone bus means responsive to said telephone control means for transmitting said first and third telephone bus signals between said telephone control means and said first modem means and for transmitting said second and fourth telephone bus signals between said telephone control means and said second modem means; and
network parallel bus means responsive to said network control means for transmitting said first and third network bus signals between said network control means and said first modem means and for transmitting said second and fourth network bus signals between said network control means and said second modem means, 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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0 Petitions
Accused Products
Abstract
Apparatus and method for enabling bilateral transmission of digital data between a local area network and telephone company networks employing both analog and digital telephone lines. A modem modulates signals responsive to signals from a local area network representing an outgoing call to form digital telephone signals suitable for transmission by a telephone line and suitable for demodulation by receiving analog modems. A circuit switched time division multiplex bus transmits the digital telephone signals to the telephone line. The modem also demodulates incoming digital telephone signals to form digital network bus signals divided into packets. A packet bus transmits the digital network bus signals to a network interface which processes the signals and transmits them to the local area network.
145 Citations
43 Claims
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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 apparatus for enabling bilateral transmission of said digital data between said digital telephone line and said network comprising in combination:
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telephone control means responsive to said first telephone signal for generating a digital first telephone bus signal representing said first data and responsive to said second telephone signal for generating a digital second telephone bus signal representing said second data; network control means responsive to said first network signal for 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; first modem means responsive to said telephone control means and said network control means for modulating said first network bus signal to form a digital third telephone bus signal representing said third data and for demodulating said first telephone bus signal to form a digital third network bus signal representing said first data; second modem means responsive to said telephone control means and said network control means 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; telephone bus means responsive to said telephone control means for transmitting said first and third telephone bus signals between said telephone control means and said first modem means and for transmitting said second and fourth telephone bus signals between said telephone control means and said second modem means; and network parallel bus means responsive to said network control means for transmitting said first and third network bus signals between said network control means and said first modem means and for transmitting said second and fourth network bus signals between said network control means and said second modem means, whereby said first and third computers bilaterally communicate via said telephone line while said second and fourth computers bilaterally communicate via said telephone line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. 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, said network enabling the transmission of said first and second network signals according to a predetermined protocol, an improved method for enabling bilateral transmission of said digital data between said telephone line and said network comprising in combination the steps of:
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forming said first network signal into a parallel digital first network bus signal comprising packets of digital signals representing said third data; processing said first network bus signal in order to modulate said third data to form a digital third telephone signal representing said third data; demodulating said first telephone signal to form a parallel digital third network bus signal comprising packets of digital signals representing said first data; forming said second network signal into a parallel digital second network bus signal comprising packets of digital signals representing said fourth data; processing said second network bus signal in order to modulate said fourth data to form a digital fourth telephone signal representing said fourth data; demodulating said second telephone signal to form a digital fourth network bus signal comprising packets of digital signals representing said second data; transmitting said third and fourth telephone signals to said telephone line; processing said third and fourth network bus signals to form third and fourth network signals; and transmitting said third and fourth network signals to said network, whereby said computers can bilaterally communicate via said telephone line. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 43)
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38. Apparatus for enabling bilateral transmission of digital data between a digital telephone line carrying multiple data channels with synchronized information and a network, said apparatus comprising in combination:
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a plurality of modems coupled between a circuit switched time division multiplex bus and a parallel bus; telephone control means coupled to said circuit switched time division multiplex bus and said digital telephone line for coupling said data channels to said circuit switched time division multiplex bus, said circuit switched time division multiplex bus maintaining the synchronization of said information in said data channels; and network control means coupled to said parallel bus and said network for coupling said parallel bus to said network, the bandwidth on said parallel bus available to each of said modems. - View Dependent Claims (39, 40, 41, 42)
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Specification