Patent ID: 6052050
Filing Date: 2000-04-18
Classification: H04L

Abstract:
A signal transmitter for transmitting an alternating current (AC) signal through an electrical contact, wherein the electrical contact has a minimum voltage rating and a minimum current rating that respectively exceeds a voltage level and a current level of the AC signal, the signal transmitter comprising:remote circuit means for sensing the AC signal;a direct current (DC) power source;local circuit means for biasing the AC signal with said DC power source;interconnection means having solely two conductive paths for electrically interconnecting said remote circuit means with said local circuit means;wherein a biased AC signal is formed by adding a DC signal bias that is provided by said DC power source to said sensed AC signal at said remote circuit means, thereby to exceed the minimum voltage and current rating of the electrical contact; andwherein said DC signal bias is removed from said sensed AC signal at said local circuit means after being transmitted through the electrical contact via said interconnection means.