Patent
Wireline modem, communication system and method of setting-up such
TLDR
In this article, the authors propose a line balance assessment for each sub-channel carrier within the system to avoid spurious energy radiation from a wireline communication resource supporting data over voice, such as in xDSL.Abstract:
To avoid spurious energy radiation from a wireline communication resource (42-44) supporting data over voice, such as in xDSL, modems (40, 46) supporting a multi-carrier transmission scheme undertake a line balance assessment (136-138) for each sub-channel carrier within the system. Specifically, an addressed modem (40) measures, for example, the signal to noise ratio of a differential transmission mode and a common transmission mode to provide the balance assessment (138). More particularly, a receive chain in the addressed modem is selectively switched (84) to receive the differential mode as appearing across the terminals of an isolation transformer (66) or the common mode (as seen with respect to ground) from a center tap (88) in a line-side winding (70) of the isolation transformer (66). Any sub-channel carrier that fails to provide a predetermined level of balance (140) is de-selected (141) by the modem and not used for traffic. Generally, the modems (40, 46) at both ends of the wire-line connection (42-44) notify one another of selected sub-channels, while the concept can be employed in a dynamic in-call fashion (152, 158-160).read more
Citations
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Patent
Performance customization system and process for optimizing XDSL performance
Gordon Bremer,Craig Matthews +1 more
TL;DR: In this article, a system and process for customizing the performance of an xDSL communication system in which a transmitting modem and/or a receiving modem will negotiate a performance parameter for adjustment is presented.
Patent
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Patent
Method for providing dynamic adjustment of frame encoding parameters in a frame-based communications network
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Method of sharing information among a plurality of stations in a frame-based communications network
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References
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Patent
Method for equalizing a multicarrier signal in a multicarrier communication system
Jacky S. Chow,John M. Cioffi +1 more
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Patent
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