Tut Systems, Inc.

Kevin Braun

Martin H Graham

Matthew Taylor

Mark S Miller

Patrick L Corder

Daran G Hermans

An xDSL modem apparatus for installation on a telephone jack wall plate. The apparatus includes a port for transmitting and receiving carrier waves, a low-pass filtering means, a high-pass filtering means, and a band-pass filtering means. The low-pass filtering means isolates low-frequency component of a received composite carrier wave below a first frequency and transmitting the isolated low-frequency component of the composite carrier wave. The high-pass filtering means isolates a high-frequency component of the composite carrier wave above a second frequency. The band-pass filtering means isolates a power component of the composite carrier wave, the power component being in a frequency range between the first and second frequencies. The apparatus also includes an xDSL modem for demodulating the high-frequency component of the composite carrier wave in order to recover a computer readable bitstream and for modulating a high-frequency carrier wave with a received computer readable bitstream. The xDSL modem transmits the demodulated computer readable bitstream and the modulated carrier wave. The apparatus also includes a means for utilizing the power component of the composite carrier wave to provide operating power for the xDSL modem.

DSL modem and a method of providing operating power for same

An encoding and decoding mechanism for communicating digital data where the binary states are represented by a duration of time between transitions of a signal. For instance, the time between zero crossings of a signal are used to represent binary states. These times can be selected so as to avoid ambiguities between the binary state being detected even where the transmission medium is irregular. A typical application is the creation of a LAN in a home using twisted pair telephone lines. The LAN can be made to be transparent and independent of telephone service received over lines shared with the LAN.

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Pleasanton, CA, United States of America

Kevin Braun