System and method for selectable mask for LDSL
AssigneeBrooktree Broadband Holding, Inc.
InventorsPatrick Duvaut, Ehud Langberg
Life of this patent
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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.
Claims6
A method for selecting a spectral mask for use with a DSL system, the method comprising:
- obtaining a weighted ratio of upstream rates and downstream rates;
- determining whether a cost function, based in part upon the weighted ratio, is greater than a predetermined value, wherein determining whether a cost function is greater than a predetermined value further comprises:
- determining a cost function according to the relation:
- cost function =2*(dsrate(2)−dsrate(1)/dsrate(1)+(usrate(2)−usrate(1))/usrate(1), wherein dsrate(1) is the downstream rate of a first mask, dsrate(2) is the downstream rate of a second mask, usrate(1) is the upstream rate of the first mask and usrate(2) is the upstream rate of the second mask;
- and
- selecting a spectral mask based in part upon the determination of whether the cost function is greater than a predetermined value.
Dependencies are inferred from the claim text.