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:
Jun. 07, 1977
Filed:
Jun. 28, 1976
Applicant:
Inventor:
Richard Scott Hoppough, Greensboro, NC (US);
Assignee:
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
1791 / ; 324 62 ;
Abstract
Apparatus which may be used in the performance of at least six tests on a telephone subscriber's line is disclosed. The apparatus operates to force the tip and ring leads of a line to particular potential levels and then produces output voltages related to the currents flowing in the tip and ring leads. These output voltages may be processed to perform the following test: dc Thevenin, ac three-terminal admittance, ac foreign emf, percent imbalance, swept loaded loop and detection of unauthorized equipment. The apparatus may be used when performing tests on other three-terminal circuits.