Bradley I 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.