Multiplex communications – Diagnostic testing – Determination of communication parameters
Reexamination Certificate
2006-08-29
2010-11-02
Nguyen, Steven H (Department: 2473)
Multiplex communications
Diagnostic testing
Determination of communication parameters
C370S276000, C370S286000, C375S215000, C375S225000
Reexamination Certificate
active
07826387
ABSTRACT:
To improve the performance of DSL modems, a DSL duplexing ratio for a new communication is selected according to the communications needs of an application. A required upstream and downstream bit rate for application communications is determined. From the ratio of these bit rates, a desired duplexing ratio is calculated. The operation of the modem is then adapted to choose a duplexing ratio that approximates the desired duplexing ratio for the application. To optimize modem operation, the size and position of the upstream and downstream bandwidths used for transmission are intelligently selected when the bit rate necessary for making the transmission is less than the total available bandwidth provided by the chosen duplexing ratio. By intelligently selecting a minimum number of subcarriers for Digital Multi-tone (DMT) signal transmission, a reduction in line driver power consumption is effectuated. Additionally, by intelligently selecting the position of the used bandwidth within the total available bandwidth, near-end crosstalk (NEXT) noise may be minimized.
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Jorgenson Lisa K.
Nguyen Steven H
STMicroelectronics Inc.
Szuwalski Andre M.
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