Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1996-05-17
1999-02-02
Kuntz, Curtis A.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379 1, 379 30, 370241, H04M 124, H04M 308, H04M 322
Patent
active
058675574
ABSTRACT:
A communication line diagnostic unit (10, 10') that allows telephone central office equipment to perform a test of a communication line and determine the ability of the line as a communication medium is shown. The device is completely passive and transparent during normal operation and responds only to a unique trigger signal generated from the central office verification controller (VC). The unit is powered from a capacitor storage element (C1) charged by the communication line through an AC coupling network (pins 11, 12 and 8) as well as through a DC network comprising voltage regulator device (Q2; Q23; Q24, Q25) when the unit is awakened. Upon receipt of the trigger signal the device responds as by disconnecting the subscriber apparatus and then providing certain electrical terminations through a single solid state switch (Q10) to allow for identification, loop resistance, noise and frequency response measurements. The unit proceeds with a preselected test sequence providing that enough energy is present on capacitor storage element (C1) prior to disconnecting the subscriber. The voltage of storage element (C1) is continually monitored and if it ever reaches a minimum energy amount required to reconnect the subscriber, the subscriber is reconnected and the test is aborted. The subscriber apparatus is disconnected by means of a latching relay (K1) in one embodiment and FET switches (Q12, Q13) in alternate embodiments.
REFERENCES:
patent: 4807277 (1989-02-01), Perry
patent: 5210477 (1993-05-01), Rowlette et al.
patent: 5604785 (1997-02-01), Pryor et al.
Charland Claude A.
D'Andrea Anthony G.
Baumann Russell E.
Donaldson Richard L.
Grossman Rene E.
Kuntz Curtis A.
Texas Instruments Incorporated
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