Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting
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United States of America Patent
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Dec 24, 2002
Issued Date -
N/A
app pub date -
Jun 16, 1998
filing date -
Apr 22, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable means for the DC termination for a variety of international phone standards. The invention may also be utilized with means for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DC holding circuit is provided in which a programmable DC current limiting mode is available. In the current limiting mode, power may be dissipated in devices external to a DAA integrated circuit. Moreover, much of the power may be dissipated in external passive devices, such as resistors.
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