Pulse or digital communications – Miscellaneous
Reexamination Certificate
2006-05-16
2006-05-16
Fan, Chieh M. (Department: 2634)
Pulse or digital communications
Miscellaneous
C379S090010, C379S251000, C379S350000, C379S377000
Reexamination Certificate
active
07046755
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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