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Hospital digital data transfer system

  • US 4,885,795 A
  • Filed: 11/06/1987
  • Issued: 12/05/1989
  • Est. Priority Date: 11/06/1987
  • Status: Expired due to Fees
First Claim
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1. A digital data transfer system comprising:

  • (a) a DC voltage source;

    (b) a load;

    (c) a direct current path between the DC voltage source and the load comprising;

    (i) a coaxial cable having a central conductor which includes first and second ends;

    (ii) a first end conductive path for connecting the DC voltage source to the first end of the central conductor; and

    (iii) a second end conductive path for connecting the load to the second end of the central conductor;

    (d) first end switch means in the first end conductive path having an open state in which the flow of DC current from the DC voltage source to the load is interrupted and a closed state in which the flow of DC current is uninterrupted;

    (e) first end bit receiving means for receiving a digital bit from a first source of such bits external to the digital data transfer system and for switching the first end switch means into its open state for a period of time corresponding to the duration of the bit;

    (f) second end switch means in the second end conductive path having an open state in which the flow of DC current from the DC voltage source to the load is interrupted and a closed state in which the flow of DC current is uninterrupted;

    (g) second end bit receiving means for receiving a digital bit from a second source of such bits external to the digital data transfer system and for switching the second end switch means into its open state for a period of time corresponding to the duration of the bit;

    (h) first end bit generating means for sensing an interruption in the flow of DC current through the first end conductive path produced by the second end switch means and generating a digital bit in response thereto; and

    (i) second end bit generating means for sensing an interruption in the flow of DC current through the second end conductive path produced by the first end switch means and generating a digital bit in response thereto.

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