At&t Intellectual Property I, LP

Sbc Knowledge Ventures, L.p.

Westell Technologies, Inc.

Thomas J McCabe

Gregory L Bella

Gregory W Gough

Charles Feucht

Thomas F Nielsen

A method is provided that includes selectively engaging impedance circuits one at a time from a plurality of selectable impedance circuits in-line with a communication channel. Each of the plurality of selectable impedance circuits includes a hybrid circuit responsive to a modem and to the communication channel. The method further includes determining a performance characteristic for each of the impedance circuits and selecting one of the plurality of selectable impedance circuits for transmission based on the respective performance characteristic.

Selectable hybrid circuitry for transmission systems and method therefor

An XDSL system comprising a hybrid circuit in operative communication with a transmission line and an XDSL modem associated with a subscriber premises. The hybrid circuit comprises a plurality of selectable impedance circuits having different impedance values. A controller selectively engages each of the impedance circuits in-line with the XDSL modem and the transmission line. The controller records the performance of the modem with each circuit engaged, and selects the desired impedance circuit as a function of the performance characteristics associated with each of the impedance circuits. The impedance circuit which provides the best performance characteristic is selected as the impedance circuit for normal modem operation.

XDSL system having selectable hybrid circuitry

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Romeoville, IL, United States of America

Thomas J McCabe