Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent
1997-04-28
1999-01-26
Loomis, Paul
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
With blocking of normal usage
379 24, 379 26, 379 30, 379 32, 324525, 324519, 324527, H04M 124, G01R 3108
Patent
active
058646027
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.
REFERENCES:
patent: 4113998 (1978-09-01), Ashdown et al.
patent: 4139745 (1979-02-01), Ashdown et al.
patent: 4602338 (1986-07-01), Cook
patent: 4611101 (1986-09-01), Walter et al.
patent: 4710949 (1987-12-01), Ahuja
patent: 4777645 (1988-10-01), Faith et al.
patent: 5073920 (1991-12-01), Masukawa et al.
patent: 5128619 (1992-07-01), Bjork et al.
patent: 5465287 (1995-11-01), Egozi
patent: 5521959 (1996-05-01), Walsworth et al.
Loomis Paul
Nynex Science & Technologies, Inc.
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