Patent ID: 7200167

Claim:
Powered side circuitry for digital direct access arrangement circuitry for terminating a phone line connection at a user end of an analog phone line, comprising: a communication interface within said powered side circuitry, said communication interface having at least one data input or data output capable of being coupled to an external user end device; an isolation interface within said powered side circuitry and coupled to said communication interface, said isolation interface capable of communicating digitally with user end phone line side circuitry through a user end isolation barrier; and encode circuitry within said isolation interface to generate an encoded digital signal from a digital data stream for transmission across said isolation barrier, wherein said encoded digital signal comprises control data added to said digital data stream, wherein the isolation interface is configured to transmit the encoded digital signal in a first direction across the user end isolation barrier and is configured to receive information provided in an opposite direction across the isolation barrier from the user end phone line side circuitry, wherein information within the digital data stream is converted to an analog form within the user end phone line side circuitry prior to transmission on the analog phone line.