Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1998-11-30
2000-07-04
Kuntz, Curtis A.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379 6, 379 24, 379 26, 379 32, 324519, 324525, 324527, H04M 124, H04M 308, H04M 322
Patent
active
060849460
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 an test signal in the 20-30 Hz range to the wire pair. The tip-to-ring capacitance is used to compute a first length, and the first length is compared to a pre-determined length. If the first length exceeds the pre-determined length, then the wire pair is qualified based upon another comparison of the measured capacitance to a pre-determined capacitance. On the other hand, the first length is less than the pre-determined length, the tip-to-ring capacitance is measured at a frequency of, preferably, 600 Hz. The test signal at this frequency minimizes errors due to resistive and inductive components of the primary constants of the wire pair and/or a ringing device connected to the wire pair. A final comparison between the pre-determined capacitance and the measured capacitance at the higher frequency determines whether or not the pair qualifies for digital transmission.
REFERENCES:
patent: 4862492 (1989-08-01), Zwick
patent: 5347225 (1994-09-01), Graham
patent: 5864602 (1999-01-01), Needle
patent: 5978449 (1999-11-01), Needle
Bell Atlantic Network Services Inc.
Kuntz Curtis A.
Michaelson Peter L.
Nguyen Duc
Peoples John T.
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