Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate
2005-05-03
2005-05-03
Isen, Forester W. (Department: 2644)
Telephonic communications
Subscriber line or transmission line interface
C379S399020, C379S402000, C379S413010, C379S413020, C379S413030, C379S413040, C379S090010, C379S093010, C379S093050, C379S093090
Reexamination Certificate
active
06888939
ABSTRACT:
The invention relates to an SLIC circuit (1), which is connected directly to a telephone line (2), for joint transmission of voice and data via the telephone line (2), with adequate echo attenuation achieved even at high data frequencies in that a first current which corresponds to the sum of the transmission and received currents (Ia, Ib), and a second current (Id) which corresponds to the current produced by the transmission power level (Vtx) at the data frequency, are produced, and the difference between the first current and the second current (Id) is emitted.
REFERENCES:
patent: 5841841 (1998-11-01), Dodds et al.
patent: 6172992 (2001-01-01), Hoffman
patent: 196 50 833 (1998-03-01), None
patent: 0 691 753 (1996-01-01), None
English Translation of PCT International Preliminary Examination Report, dated Mar. 14, 2001, 5 pgs.
Corless Peter F.
Edwards & Angell LLP
Hartnell, III George W.
Infineon - Technologies AG
Isen Forester W.
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