Pulse or digital communications – Miscellaneous
Reexamination Certificate
2008-04-22
2008-04-22
Ghayour, Mohammed (Department: 2611)
Pulse or digital communications
Miscellaneous
C375S257000, C375S220000, C375S285000, C379S412000, C379S090010, C379S399010
Reexamination Certificate
active
10292290
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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Copending U.S. Patent Application, filed currently herewith, “Digital Access Arrangement Circuitry And Method For Connecting To Phone Lines Having A DC Holding Circuit With Programmable Current Limiting”.
Copending U.S. Patent Application, filed currently herewith, “Digital Access Arrangement Circuitry And Method For Connecting To Phone Lines Having A DC Holding Circuit With Switchable Time Constants”.
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Silicon Syst
Dupuis Timothy J.
Scott Jeffrey W.
Sooch Navdeep S.
Tuttle George Tyson
Welland David R.
Ghayour Mohammed
Malek Leila
O'Keefe, Egan Peterman & Enders LLP
Silicon Laboratories Inc.
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