Multiplex communications – Generalized orthogonal or special mathematical techniques – Fourier transform
Reexamination Certificate
1998-06-25
2003-04-15
Hsu, Alpus H. (Department: 2665)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Fourier transform
C375S233000, C375S350000
Reexamination Certificate
active
06549512
ABSTRACT:
TECHNICAL FIELD
This invention relates to modem data communications between telecommunications networks and remote or end user installations over twisted metallic wire pairs.
BACKGROUND OF THE INVENTION
The background of the invention is given in copending Ser. No. 08/667,267, filed Jun. 20, 1996, entitled “Multimode Digital Modem”; U.S. Pat. No. 5,285,474; U.S. Pat. No. 5,400,322; U.S. Pat. No. 5,479,447; U.S. Pat. No. 5,623,513; ANSI TI.413-1995, “Network and Customer Installation Interfaces—Asymmetric Digital Subscriber Line (ADSL) Metallic Interface” (1995); and ANSI TI.413 Issue 2, “Interface Between Networks and Customer Installation—Asymmetric Digital Subscriber Line (ADSL) Metallic Interface” (draft May 4, 1998); the entireties of all of which are incorporated herein by reference.
SUMMARY OF THE INVENTION
The invention provides a medium rate digital subscriber line modem solution for modem data communications between telecommunications networks and remote or end user installations over twisted metallic wire pairs.
REFERENCES:
patent: 4683578 (1987-07-01), Betts et al.
patent: 5400322 (1995-03-01), Hunt et al.
patent: 5479447 (1995-12-01), Chow et al.
patent: 5999563 (1999-12-01), Polley et al.
patent: 6052380 (2000-04-01), Bell
patent: 6389062 (2002-05-01), Wu
Cheng Yaqi
Shaver Donald P.
Wu Song
Brady III Wade James
Franz Warren L.
Ho Duc
Hsu Alpus H.
Telecky , Jr. Frederick J.
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