System for connecting computers via telephone lines
First Claim
Patent Images
1. A local area computer network for connecting a plurality of computer products, the network comprising:
- a telephone cable containing four or more wires at least two of which are not used to transmit telephone signals, said telephone cable including at least two predetermined signal lines selected form the unused wires in the telephone cable that are unshielded and are used to transfer signals between computer products on the network while simultaneously allowing a telephone to use a remaining pair of wires in the telephone cable; and
a connector associated with each computer product for connecting a computer product through the at least two predetermined signals lines to a second computer product for exchange of information between computer products in a network;
wherein said connector comprises;
a first connection for receiving signals from and for passing signals to each of the two predetermined singal lines;
a second connection having at least two signal lines for connecting to a computer product for sending signals to, and for receiving signals from, said computer product according to the E.I.A. RS-422 standard; and
means connected to the first connection for suppressing static that appears at the first connection and for transferring signals between the first and second connections.
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Abstract
A system for connecting a plurality of computers and computer peripherals into a network using two unshielded lines of the type included in a telephone cable. A floating ground isolation circuit is used to aid suppression of non-zero static voltages and voltage surges.
64 Citations
20 Claims
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1. A local area computer network for connecting a plurality of computer products, the network comprising:
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a telephone cable containing four or more wires at least two of which are not used to transmit telephone signals, said telephone cable including at least two predetermined signal lines selected form the unused wires in the telephone cable that are unshielded and are used to transfer signals between computer products on the network while simultaneously allowing a telephone to use a remaining pair of wires in the telephone cable; and a connector associated with each computer product for connecting a computer product through the at least two predetermined signals lines to a second computer product for exchange of information between computer products in a network;
wherein said connector comprises;a first connection for receiving signals from and for passing signals to each of the two predetermined singal lines; a second connection having at least two signal lines for connecting to a computer product for sending signals to, and for receiving signals from, said computer product according to the E.I.A. RS-422 standard; and means connected to the first connection for suppressing static that appears at the first connection and for transferring signals between the first and second connections.
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2. A local area network connector for connecting a computer product to the signal lines in a local area network, comprising:
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a first connection for receiving signals from and for passing signals to each of two signal lines in the local area network; a second connection having at least two signal lines and being connectable to the computer product for sending signals to, and for receiving signals from, the computer product according to the E.I.A. RS-422 standard; and means connected to the first connection for suppressing static at the first connection and for allowing transfer of signals between the first and second connections.
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3. A local area computer network for connecting a plurality of computer products, the network comprising:
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a telephone cable containing four or more wires at least two of which are not used to transmit telephone signals, said telephone cable including at least two predetermined signal lines selected from the unused wires in the telephone cable that are unshielded and are used to transfer signals between computer products on the network while simultaneously allowing a telephone to use a remaining pair of wires in the telephone cable; and a connector associated with each computer product for connecting a computer product through the at least two predetermined signal lines to a second computer product for exchange of information between computer products in a network;
wherein said connector comprises;a first connection for receiving signals from and for passing signals to each of the two predetermined signal lines; suppression means connected to the first interface means for limiting voltage surges and for suppressing static that appears tat the first connection; a second connection having at least two signal lines for connecting to a computer product for sending signals to, and for receiving signals, from, said computer product according to the E.I.A. RS-422 standard; and an electrical isolator connected between the first connection and the second connection for transferring signals between the first and second connections. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. A local area network connector for connecting a computer product to the signal lines in a local area network, comprising:
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a first connection for receiving signals from and for passing signals to each of two signal lines in the local area network; suppression means connected to the first connection for limiting voltage surges and for suppressing static that appears at the first connection; a second connection having at least two signal lines and being connectable to the computer product for sending signals to, and for receiving signals from, the computer product according to the E.I.A. RS-422 standard; and an electrical isolator connected between the first connection and to the second connection for allowing transfer of signals between the first and second connections. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A local area computer network for connecting a plurality of computer products, the network comprising:
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a telephone cable containing four or more wires at least two of which are not used to transmit telephone signals, said telephone cable including at least two predetermined signal lines elected from the unused wires in the telephone cable that are unshielded and are used to transfer signals between computer products on the network while simultaneously allowing a telephone to use a remaining pair of wires in the telephone cable; and a connector associated with each computer product for connecting a computer product through the at least two predetermined signal lines to a second computer product for exchange of information between computer products in a network;
wherein said connector comprises;a first connection for receiving signals from and for passing signals to each of the two predetermined signal lines; suppression means connected to the first connection for suppressing static that appears at the first connection; a second connection having at least two signal lines for connecting to a computer product for sending signals to, and for receiving signals from, said computer product according to the E.I.A. RS-422 standard; and an electrical isolator connected between the first connection and the second connection for transferring signals between the first and second connections. - View Dependent Claims (19)
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20. A local area network connector for connecting a computer product to the signal lines in a local area network, comprising:
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a first connection for receiving signals from and for passing signals to each of two signal lines in the local area network; suppression means connected to the first connection for suppressing static that appears at the first connection; a second connection having at least two signal lines and being connectable to the computer product for sending signals to, and for receiving signals from , the computer product according to the E.I.A. RS-422 standard; and an electrical isolator connected between the first connection and the second connection for allowing transfer of signals between the first and second connections.
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Specification