Nortel Networks Corporation

Bigband Networks Bas, Inc.

J David Unger

John Ulm

Wilson E Sawyer

Eugene E O'Neil, Jr

The signal distortion present in a transmitted signal is measured and used to generate filter coefficients. The coefficients are stored in memory. A modulator generates an intermediate frequency signal. The modulator inputs the signal to a programmable predistortion filter. The characteristics of the filter are altered by the filter coefficients that have been programmed into the filter. The resulting filtered signal is upconverted to a frequency in a transmit frequency band.

Transmit pre-equalization in a modem environment

A method and apparatus for initialization and operation of cable modems comprising initializing the cable modems over management channels and transferring the cable modems to a data channel for operation. Initialization over a management channel overcomes certain prior art constraints associated with initialization over the data channel.

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Windham, NH, United States of America

J David Unger