Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2006-07-04
2006-07-04
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
C324S645000, C379S027030
Reexamination Certificate
active
07071700
ABSTRACT:
The structural and termination characteristics of a telephone or other wiring circuit can be determined by generating a continuous stream of low-energy electrical signals, injecting these into the circuit under test, and analyzing the energy reflected at impedance changes in the frequency domain. Standing waves occurring in the circuit can be identified as a function of frequency and analyzed to locate the impedance discontinuities. An unambiguous numerical representation of the circuit can be generated and used to categorically determine if two circuits are indeed alike, or whether the structural and termination characteristics of a particular circuit has remained the same or changed over time. Waveforms are employed that are not sensed by circuits that carry digital telephone traffic, so that the invention is useful in characterizing and providing security protection for those type of circuits in situ.
REFERENCES:
patent: 4229626 (1980-10-01), Peoples
patent: 4630228 (1986-12-01), Tarczy-Hornoch et al.
patent: 4634813 (1987-01-01), Hensley
patent: 5994905 (1999-11-01), Franchville
patent: 6177801 (2001-01-01), Chong
patent: 6477238 (2002-11-01), Schneider et al.
patent: 6507199 (2003-01-01), Ahrndt et al.
patent: 6538451 (2003-03-01), Galli et al.
patent: 6566889 (2003-05-01), Warke
International Search Report; Mar. 19, 2004 (1 Page).
Angeli Michael de
Deb Anjan
Wire Eye Co.
LandOfFree
Characterizing analog and digital telephone circuits and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Characterizing analog and digital telephone circuits and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Characterizing analog and digital telephone circuits and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3609382