Patent ID: 7283584
Filing Date: 2007-10-16
Classification: H04L,H04M

Abstract:
1. Powered side circuitry for digital direct access arrangement circuitry for terminating a phone line connection at a user end of a phone line, comprising: a communication interface capable of being coupled to an external user end device; an isolation interface capable of communicating digitally with user end phone line side circuitry through a user end isolation barrier that comprises a plurality of isolation elements; and encode circuitry within said isolation interface to generate an encoded digital differential signal from a digital data stream for transmission across at least two of the isolation elements of said isolation barrier, the at least two isolation elements comprising at least a first isolation capacitor and a second isolation capacitor, and the isolation interface being capable of communicating bi-directionally across said first and second isolation capacitors of said isolation barrier; wherein said encoded digital differential signal comprises control data added to said digital data stream and wherein said encoded digital differential signal comprises framing data added to said digital data stream for data synchronization within said phone line side circuitry; wherein the powered side circuitry is configured to provide a clock signal to the phone line side circuitry through at least one of the plurality of isolation elements; and wherein the powered side circuitry is configured so that power is capable of being provided from the powered side circuitry to the phone line side circuitry while still maintaining the isolation required by the phone line isolation regulatory standards.