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LINE AND LINK SENSING TECHNIQUE FOR PABX TELEPHONE SYSTEM

  • US 3,729,594 A
  • Filed: 07/22/1971
  • Issued: 04/24/1973
  • Est. Priority Date: 07/22/1971
  • Status: Expired due to Term
First Claim
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1. A communication system including:

  • a plurality of peripheral circuits including a plurality of lines, a plurality of trunks, and a plurality of registers;

    a switching network for interconnecting said peripheral circuits;

    marker means connected to said switching network;

    a central processor operated to control said marker means to operate said switching network to selectively interconnect said peripheral circuits;

    scanning means under control of said central processor operated to periodically determine the busy/idle status of said switching network;

    said switching network comprising, a plurality of matrices each including a plurality of crosspoints operable in response to said marker, to establish circuit connections through said switching network between said peripheral circuits, a portion of said crosspoints each including associated means for indicating the operational state of said associated crosspoint;

    said scanning means periodically operated under control of said central processor to scan said indicating means to determine the operational state of said associated crosspoints, whereby the operated status of connecting paths through said associated crosspoints is determined, permitting said central processor to select connecting paths through said switching network between said peripheral circuits.

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