The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 11, 1979
Filed:
Aug. 14, 1978
Applicant:
Inventors:
Robert A Durance, Richmond, CA;
John A Cribb, Ottawa, CA;
Assignee:
Mitel Corporation, , CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; H04Q / ;
U.S. Cl.
CPC ...
1791 / ; 179 / ;
Abstract
A junctor checking system for an electronic PABX which checks the potential of the junctor under control of a microprocessor. A voltage level sensing circuit is connected to the junctor to be checked; a resistor connects the input of the voltage level sensing circuit to a voltage source. In the event the impedance of the junctor to ground is not as expected with respect to at least one threshold, the junctor is considered faulty and a different idle junctor is selected.