System and method for selectable mask for LDSL

Details System and method for selectable mask for LDSL System and method for selectable mask for LDSL

2007-09-18

2007-09-18

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Transceivers

Modems

C375S219000, C375S224000, C375S220000

Reexamination Certificate

active

10714907

ABSTRACT:
The present invention overcomes various problems by defining two upstream masks (U1, U2) and two downstream masks (D1, D2) and using a mask selectable system for the long reach digital subscriber line (LDSL), in which a unique modem feature is activated during handshake to automatically check for physical layer status in terms of spectral compatibility and, thus, automatically optimize the boosted mode with the use of the mask selectable system choose the best combination of upstream/downstream masks in any physical layer noise scenario.

REFERENCES:
patent: 6333920 (2001-12-01), Nguyen et al.
Ginis et al., “Vectored Transmission for Digital Subscriber Line Systems,” IEEE Journal on Selected Areas in Communications, vol. 20, No. 5, Jun. 2002, pp. 1085-1104.
International Search Report dated May 21, 2004 for Application No. PCT/US03/36843.
Feng Ouyang et al., the first step of long-reach adsl:smart dsl technology, readsl, Topics in Broadband Access, IEEE Communications Magazine, Sep. 2003, pp. 124-131.

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