Patent ID: 7003023
Filing Date: 2006-02-21
Classification: H04L,H04M

Abstract:
1. An isolation system for providing an isolated telephone line communication channel for digital data signals in a forward direction and in a reverse direction across an isolation barrier, the system comprising: a plurality of isolation elements which form the isolation barrier, at least two of the isolation elements being isolation capacitors, the at least two isolation capacitors comprising at least a first isolation capacitor and a second isolation capacitor; a powered system on a first side of the isolation barrier, the powered system coupled to the isolation barrier for driving a forward direction digital differential signal across at least the first isolation capacitor and the second isolation capacitor; an isolated system on a second side of the isolation barrier, the isolated system coupled to the isolation barrier for driving a reverse direction digital differential signal across at least the first isolation capacitor and the second isolation capacitor; and an analog to digital converter located on the second side of the isolation barrier, the analog to digital converter configured to allow offset calibration; wherein the forward direction digital differential signal and the reverse direction digital differential signal are both driven through the same first and second isolation capacitors so that the first and second isolation capacitors bidirectionally transfer the forward direction and reverse direction digital differential signals; wherein the isolated system receives at least some power transferred from the powered system from across the isolation barrier for providing a power supply on the second side of the isolation barrier; and wherein the isolated system receives a clock signal from the powered system through at least one of the plurality of isolation elements.