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:
Nov. 02, 1999
Filed:
Dec. 21, 1998
Applicant:
Inventor:
Jack Needle, Dix Hills, NY (US);
Assignee:
Nynex Science & Technologies, Inc., White Plains, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; G01R / ;
U.S. Cl.
CPC ...
379-6 ; 379 24 ; 379 26 ; 379 30 ; 379 32 ; 324519 ; 324525 ; 324527 ;
Abstract
A telephone wire pair is qualified for digital signal transmission by central office testing. The tip-to-ring capacitance of the wire pair is measured while applying to the wire pair an AC test signal at 600 Hz. The test signal at this frequency minimizes errors due to line inductance and/or a ringing device connected to the wire pair. Reliable measurement of the length of the wire pair is achieved. Flaws in cable sheathing can also be detected based on measurement of tip-to-ground capacitance and/or ring-to-ground capacitance.