Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate
2005-07-26
2005-07-26
Tran, Sinh (Department: 2644)
Telephonic communications
Subscriber line or transmission line interface
C379S413010, C379S413030, C379S413040
Reexamination Certificate
active
06922469
ABSTRACT:
A communication system of the present invention utilizes ring detection circuitry on both sides of an isolation barrier. More particularly, the ring detection circuitry may include ring burst circuitry on the phone line side of the isolation barrier and ringer timing circuits on the powered side of the isolation barrier. The digital burst peak signal may be transmitted through the isolation banier to the finger timing circuits. By splitting the ring detection circuitry so that the ringer timing circuits are placed on the powered side of the isolation barriers, a significant reduction in the power usage on the phone line side of the barrier related to the ring detection function may occur. The outputs of the ringing timing circuits may be provided to circuits on either side of the isolation barrier. Thus, the ring detection function may be accomplished in a system utilizing an efficient bidirectional capacitive barrier while still minimizing power usage on the line side of the barrier.
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Hein Jerrell P.
Scott Jeffrey W.
Sooch Navdeep S.
Welland David R.
O'Keefe Egan & Peterman, LLP
Silicon Laboratories Inc.
Singh Ramnandan
Tran Sinh
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