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In modern DSL networks, crosstalk among different lines (i.e., users) is the major source of performance degradation. Dynamic Spectrum Management (DSM) refers to a set of techniques to mitigate the effect of crosstalk leading to spectacular performance gains. However the main research efforts in DSM aim at only physical layer performance whereas the true end user experience depends on what they see at the application rather than the physical layer. Upper layer performance metrics like throughput and delay may be much more important to improve the user satisfaction. To that end, the authors provide a framework to study upper layer performance by looking at scheduling and DSM together.
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