Telephonic communications – Subscriber line or transmission line interface – Network interface device
Reexamination Certificate
2005-12-13
2005-12-13
Tran, Sinh (Department: 2644)
Telephonic communications
Subscriber line or transmission line interface
Network interface device
C379S399010, C379S399020, C379S403000, C379S404000, C379S413010, C379S413030, C379S413040
Reexamination Certificate
active
06975723
ABSTRACT:
A communication system is provided which draws virtually no loop current during a ringing burst and only draws on-hook loop current during the caller ID field. More particularly, ringer burst circuitry may be powered from the user powered circuitry by the transmission of power across the isolation barrier rather than being powered from the phone line. Thus, loop current need not be drawn from the TIP/RING lines during ringer bursts. The isolation barrier may be a capacitive isolation barrier which allows bidirectional communication and extraction of power from signals transmitted across the barrier.
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Hein Jerrell P.
Krone Andrew W.
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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