Modem having a programmable universal data access arrangement

Details Modem having a programmable universal data access arrangement Modem having a programmable universal data access arrangement

1998-11-16

2000-06-27

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 9305, H04M 1100

Patent

active

060815868

ABSTRACT:
A modem utilizing a DAA having line side circuitry including a telephone network interface and system side circuitry including a host system interface, the line side circuitry and the system side circuitry being separated by a high voltage isolation barrier. A CODEC is provided in the line side circuitry, such that encoded information generated by the CODEC, as well as information for decoding by the CODEC, are communicated across the high voltage isolation barrier. These communications are accomplished in a digital manner. In an alternate embodiment of the invention, the line side circuitry of the modem further includes programmable detection and measurement circuitry that is programmable to measure electrical characteristics (e.g., tip/ring voltage and loop current) of the telephone line interface connection and is capable of corresponding adjustments to enable compliance with applicable regulations. The system is software programmable via control signals sent across the high voltage isolation barrier to establish electrical parameters corresponding to a specific country where the equipment may be used.

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Silcon Laboratories, Direct Digital Access Arrangement (DDAA), Si3032, pp. 1-28, Preliminary Rev. 0.9, Feb. 1998.
Siemens, User's Manual--ICs for Communication, PSB 4595 Version 2.0 and PSB 4596 Version 2.1, pp. 1-100, Apr. 1997.

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