Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate
2006-05-16
2006-05-16
Tran, Sinh (Department: 2646)
Telephonic communications
Subscriber line or transmission line interface
C379S399020, C379S413010, C379S413020, C379S413040
Reexamination Certificate
active
07046793
ABSTRACT:
A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end to provide a communication path for signals to and from the phone lines. Briefly described, a means for providing a proper hookswitch transition for a variety of international phone standards is provided. The invention may also be utilized with means for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DAA circuitry may be utilized which satisfies many or all hookswitch transition standards without the use of additional discrete devices. The hookswitch transition standards may be satisfied by ramping down the current flowing through the hookswitch prior to transitioning the hookswitch state. In this manner the hookswitch current change as a function of time (di/dt) may be decreased. Thus, the current through the hookswitch may be actively controlled prior to switching the hookswitch from an off-hook condition to an on-hook condition. By controlling the current drawn from the phone lines through the hookswitch, the maximum voltage seen at the phone company exchange may be decreased.
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Scott Jeffrey W.
Sooch Navdeep S.
Tuttle George Tyson
Welland David R.
O'Keefe Egan & Peterman, LLP
Silicon Laboratories Inc.
Singh Ramnandan
Tran Sinh
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