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Multi-line telephone system

  • US 4,631,367 A
  • Filed: 08/29/1984
  • Issued: 12/23/1986
  • Est. Priority Date: 08/29/1984
  • Status: Expired due to Fees
First Claim
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1. A multi-line telephone system comprising:

  • a plurality of telephone station sets operably connected together;

    at least one of said station sets being adapted to interface with telephone CO lines;

    at least one of said station sets being adapted to interface with a common power source;

    a bus means operably connecting said station sets together in bussed loop fashion;

    said bus means including at least one status signal conductor for providing CO line status information to said station sets;

    each said station set having drive circuit means for impressing variable value CO line status signals on said one status signal conductor in accordance with the line status imparted by the respective said station set, and detector circuit means for detecting the varying values of such a line status signal;

    reference voltage generating means located in each said station set and independently operable from such a common power source to generate in each said station set reference voltages for comparison with such a line status signal by said detector circuit means to determine CO line status; and

    each said station set further including indicator means which are operable in response to the line status signal detected by the said detector circuit means of the respective said station sets to inform users of said respective station sets of CO line status.

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