Echelon Corporation

Kurt A Stoll

Stephen F Dreyer

Donald D Baumann

Rod G Sinks

W Mike Berke

Karl F Osterlund

A transceiver module for coupling between cells in a distributed intelligence network and a twisted pair line. The module receives power from the line and provides power to its respective cell. At the end of transmitting a packet, the transceiver transmits a code violation, then an anti-code violation to dissipate energy in the line. This is followed by clamping the line for the dead time between packets. N transceivers may be connected (without a cell) to form a repeater. The transceiver module may be used in a network having free topology; that is, an ideal transmission line, with terminators is not needed.

Method and apparatus for interfacing between a twisted pair and an

A transceiver for transmitting and receiving digital data represented as stair-stepped sinusoidal waveforms over twisted pair lines interconnecting nodes of a network. The transmitter of the transceiver converts square waves into the stair stepped sinusoidal waveforms by utilizing a number of current sources for supplying differing amounts of current to a resistor coupled across the twisted pair lines. Shift registers control a set of switches which control the direction and the amount of current flowing through the resistor. Thereby, the output voltage across the resistor can be controlled to produce the stair-stepped sinusoidal waveform by clocking the digital signal to the shift registers. The receiver of the transceiver re-converts received stair-stepped sinusoidal waveforms back to their respective digital signals.

Transceiver for transmitting and receiving stair-stepped sinusoidal

A transceiver module for coupling between cells in a distributed intelligence network and a twisted pair line. The module receives power from the line and provides power to its respective cell. At the end of transmitting a packet, the transceiver transmits a code violation (pulse), then an anti-code violation (pulse of opposite polarity) to dissipate energy in the line. This is followed by clamping the line for the dead time between packets. N transceivers may be connected (without a cell) to form a repeater. The transceiver module may be used in a network having free topology; that is, an ideal transmission line, with terminators is not needed.

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Fremont, CA, United States of America

Kurt A Stoll