Subscriber interface circuit

Details Subscriber interface circuit Subscriber interface circuit

2006-02-28

2006-02-28

Swerdlow, Daniel (Department: 2646)

Telephonic communications

Subscriber line or transmission line interface

Network interface device

C379S093010

Reexamination Certificate

active

07006626

ABSTRACT:
A subscriber line interface circuit is provided that posses an output impedance that may be greater than about 2.2 Kohms at at least some frequencies associated ADSL communications. In at least some embodiments, such ADSL frequencies include frequencies greater than about 30 KHz. In some embodiments, the subscriber line interface circuit includes an output driver that provides voice signals on a telephone line on which digital data is also provided by a data driver and a filter coupled to the output driver wherein the output impedance of the subscriber line interface circuit is greater than about 2.2 Kohms at at least some frequencies greater than 30 KHz.

REFERENCES:
patent: 6002684 (1999-12-01), McVerry
patent: 6285672 (2001-09-01), McVerry et al.
patent: 6483904 (2002-11-01), Yucebay
patent: 2002/0098863 (2002-07-01), Ferianz

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