Cynthia H Lin

US Patent:

6975676, Dec 13, 2005

Filed:

Sep 25, 2000

Appl. No.:

09/670047

Inventors:

Richard L. Goodson - Hunstville AL, US
Steven R. Blackwell - Huntsville AL, US
Ayman Ghobrial - Huntsville AL, US
Cynthia Lin - Madison AL, US

Assignee:

Adtran, Inc. - Huntsville AL

International Classification:

H04B001/10

US Classification:

375231, 375326, 375350, 375354

Abstract:

A timing loop is used in a data communications receiver to time lock the receiver to a transmitter sending data across a communications loop, where the receiver includes a linear equalizer for correcting signal distortion associated with the communications loop. The timing loop includes a timing equalizer filter functionally positioned to provide an equalized signal to the phase detector portion of the timing loop. After the linear equalizer trains, the equalizer coefficients are copied to the timing equalizer.

US Patent:

20030123487, Jul 3, 2003

Filed:

Jun 28, 2002

Appl. No.:

10/187263

Inventors:

Steven Blackwell - Huntsville AL, US
Cynthia Lin - Madison AL, US

International Classification:

H04J001/00

US Classification:

370/485000

Abstract:

Techniques that allow SHDSL-based systems to share the same transmission line with low frequency voice services such as POTS are disclosed.

US Patent:

6876696, Apr 5, 2005

Filed:

Sep 25, 2000

Appl. No.:

09/668856

Inventors:

Richard L. Goodson - Huntsville AL, US
Steven R. Blackwell - Huntsville AL, US
Ayman Ghobrial - Huntsville AL, US
Cynthia Lin - Madison AL, US

Assignee:

Adtran, Inc. - Huntsville AL

International Classification:

H04B001/38

US Classification:

375219, 375232, 375341, 375354, 375231, 375355, 375220, 370497

Abstract:

A method of training and operating a dual-duplex, four-wire communications system to provide for time alignment in the receivers of data that is time aligned in the transmitters, even in the presence of a differential transmission delay in the wire pairs. In a training mode, a known sequence of training data is concurrently sent across each wire pair such that equalizers in the receivers are forced to train together. After the equalizers have been trained to eliminate the differential delay, the system is switched to a data mode.