Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent
1997-11-06
1999-02-09
Loomis, Paul
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of network terminating interface, subscriber trunk...
379 30, 379 32, 324534, 324544, H04M 124, G01R 3111, H01H 3102
Patent
active
058704515
ABSTRACT:
A line test system for diagnosing and segmenting faults in a switched telephone network. The system includes a remote measurement unit installed at a switch and a test system controller. The test system controller stores data about operating parameters of each of the subscriber lines when they are believed to be free of faults. When a fault is reported, the parameters are measured again. By comparison of the measured parameters with the stored parameters, the fault can be segmented between the premise and the network. Segmentation is performed using knowledge based analysis techniques. The actual source of the fault once it is repaired is also stored by the test system controller. This historical information is used to improve the accuracy of the knowledge based analysis techniques used for segmentation. The line test system is capable of detecting the presence of high impedance ringers. Information on high impedance ringers is used to distinguish between lines that contain open circuit faults and lines that are terminated with high impedance ringers.
REFERENCES:
patent: 5083086 (1992-01-01), Steiner
patent: 5319311 (1994-06-01), Kawashima et al.
patent: 5606592 (1997-02-01), Galloway et al.
Groessl David J.
Schmidt Kurt E.
Winkler Richard G.
Loomis Paul
Teradyne, Inc.
Walsh Edmund J.
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