System for connecting computers via telephone lines

  • US 5,003,579 A
  • Filed: 09/07/1989
  • Issued: 03/26/1991
  • Est. Priority Date: 08/22/1986
  • Status: Expired due to Fees
First Claim
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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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