Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Patent
1993-04-30
1995-08-01
Chin, Stephen
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of trunk or long line
379 1, 379 26, 379 27, 379 28, 379 30, H04M 124, H04M 322
Patent
active
054386063
ABSTRACT:
An open power loop detector for digital transmission line elements using a pulsed, direct current test. The element detects when a fault in transmission lines has been corrected and the element should move from a loop powered mode back to a normal through powered mode. The detector includes a voltage regulator, voltage booster, current detector, and controller. The controller periodically activates the voltage booster to increase the direct current load between the transmit and receive cable pairs of the transmission lines. The current detector then senses whether a current is flowing between the center tap leads of the transmit cable pair. If no current is detected, indicating that the downstream transmission line still has a discontinuity, the controller waits a predetermined period of time before again activating the voltage booster and performing another test. When the current detector detects current during such a test, indicating that the cable incontinuity has been repaired, the controller moves the element to a through powered mode of operation.
REFERENCES:
patent: 4926458 (1990-05-01), Reger et al.
patent: 4937851 (1990-06-01), Lynch
patent: 5003573 (1991-03-01), Agah et al.
Intel--"8-Bit Embedded Controllers" Handbook and U.S. and Canada Literature Order Form--1991.
Intel--"Advance Information" brochure--Oct. 1989--pp. 8-139 to 8-151.
Oki--"Data Book for Microcontroller"--Jun., 1990 (Fifth Ed.).
Philips--"Data Handbook for 80C51-Based 8-Bit Microcontrollers"--Feb., 1992.
Signetics--"Microcontroller Products"--Product Specification--Feb. 5, 1992--pp. 541-559.
National--"Telecommunications Databook"--1992 Edition--pp. i-iii, 1-17-87, 1-128-144.
Ericsson--Booklet "PBL 3798 Subscriber Line Interface Circuit"--Sep., 1989.
Chin Stephen
Shankar Vijay
Teltrend Inc.
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