Bradley R Tidwell

US Patent:

7023963, Apr 4, 2006

Filed:

Mar 31, 2003

Appl. No.:

10/403321

Inventors:

Fred T. Chu - Madison AL, US
Dennis B. McMahan - Huntsville AL, US
James Ernest Owen - Huntsville AL, US
Bradley Dwayne Tidwell - Harvest AL, US

Assignee:

Adtran, Inc. - Huntsville AL

International Classification:

H04M 1/24
H04M 3/08
H04M 3/22

US Classification:

379 1505, 379 2202, 379 2203, 379 2204

Abstract:

A digital subscriber loop line card-installed mechanism conducts parametric measurements on the wireline to which the line card is connected, and adjusts taps of an echo cancellation operator in accordance with the response of the wireline to an electrical stimulus imparted to the wireline. The echo canceler tap coefficients are then processed to determine the location of a fault, such as a short circuit, open-circuit and the like, on the wireline. Fault information measurement data is then reported to a supervisory control location, which dispatches the appropriate technician to resolve the cause of the problem.

US Patent:

7203159, Apr 10, 2007

Filed:

Jun 11, 2002

Appl. No.:

10/167012

Inventors:

Dennis B. McMahan - Huntsville AL, US
Bradley D. Tidwell - Harvest AL, US

Assignee:

Adtran, Inc. - Huntsville AL

International Classification:

G01R 31/08

US Classification:

370216, 370522, 370228, 370465

Abstract:

A back-up channel line card-installed ESF framing mechanism independently sources an FDL signaling channel for the transport of protection switch signaling information, taking advantage of the fact that DSL multiplexer equipment is capable of accepting and processing ESF framed digital data, including embedded FDL-based signaling information. Upon completion of transport of the FDL-based signaling information, the back-up channel is used for data transport in place of a faulty channel.

US Patent:

7302047, Nov 27, 2007

Filed:

Dec 8, 2005

Appl. No.:

11/297131

Inventors:

Bradley Dwayne Tidwell - Harvest AL, US
Steven M. Robinson - Madison AL, US
James Michael Hawkins - Albertville AL, US

Assignee:

Adtran, Inc. - Huntsville AL

International Classification:

H04M 1/24
H04M 3/08
H04M 3/22
H02H 3/00

US Classification:

379 2203, 379 2204, 379 2705, 379 2901, 361 42

Abstract:

Whether or not protection circuitry for a span-powered remote digital subscriber loop unit is properly connected to earth ground is determined by the deliberate assertion and detection of a ground fault from a central office line card location. The span-powered remote unit is augmented to place a controllable conduction path in circuit with the span-powered loop and an earth ground pin. If the earth ground pin has been properly connected to earth ground, applying the conductive path will place a ground fault on the span, which is detected by a ground fault detector within the central office line card. If the ground fault detector does not detect a ground fault in response to the application of the conductive path, the line card forwards a negative ground fault event message to a test center, so that a service technician may be dispatched to the remote unit to correct the problem.

US Patent:

20040190686, Sep 30, 2004

Filed:

Mar 31, 2003

Appl. No.:

10/403308

Inventors:

Bradley Tidwell - Harvest AL, US
Steven Robinson - Madison AL, US
James Hawkins - Albertville AL, US

Assignee:

ADTRAN, INC. - Huntsville AL

International Classification:

H04M001/24
H04M003/08
H04M003/22

US Classification:

379/022070

Abstract:

Whether or not protection circuitry for a span-powered remote digital subscriber loop unit is properly connected to earth ground is determined by the deliberate assertion and detection of a ground fault from a central office line card location. The span-powered remote unit is augmented to place a controllable conduction path in circuit with the span-powered loop and an earth ground pin. If the earth ground pin has been properly connected to earth ground, applying the conductive path will place a ground fault on the span, which is detected by a ground fault detector within the central office line card. If the ground fault detector does not detect a ground fault in response to the application of the conductive path, the line card forwards a negative ground fault event message to a test center, so that a service technician may be dispatched to the remote unit to correct the problem.