Integrated modem and line-isolation circuitry and associated method powering caller ID circuitry with power provided across an isolation barrier

A telephone line isolation system, comprising:

• a line-side line-isolation integrated circuit, the line-side integrated circuit configured to be coupled between a phone line isolation barrier and a phone line;
• a power supply within the line-side line isolation circuit, the power supply configured to be generated from power transmitted across the phone line isolation barrier;
• and
• a caller ID circuit integrated within the line-side isolation integrated circuit, the caller ID circuit configured to receive caller ID data from the phone line and to be powered by the power supply, the caller ID circuitry comprising analog-to-digital converter circuitry configured to output digital data representative of caller ID information.

A method for combining line-isolation and modem data processing, comprising:

• providing a phone line isolation barrier comprised of at least one capacitor;
• providing a system-side line-isolation integrated circuit capable of transmitting digital data across the isolation barrier and capable of receiving digital data across the isolation barrier;
• providing a line-side line-isolation integrated circuit capable of transmitting digital data across the isolation barrier and capable of receiving digital data across the isolation barrier;
• providing a caller ID circuit within the line-side line-isolation integrated circuit, the caller ID circuit being powered by power transmitted across the isolation barrier, and the caller ID circuitry comprising analog-to-digital converter circuitry configured to output digital data representative of caller ID information;
• communicating digital information between the line-side line-isolation integrated circuit and the system-side line-isolation integrated circuit through the isolation barrier, the digital information from the line-side line-isolation integrated circuit being configured to include the digital data representative of caller ID information;
• processing the digital data transmitted or received across the isolation barrier with a digital processor within the system-side line-isolation integrated circuit;
• and
• also processing the digital data transmitted or received across the isolation barrier with a modem processor within the system-side line-isolation integrated circuit.