Band preference in dynamic spectrum management

The use of band preference in DSL systems with dynamic spectrum management (DSM) is investigated. Specifically, band preference is a DSM center's allocation of approximate PSD masks for subsequent use in the commonly encountered fixed-margin or “iterative” water-filling DMT DSL systems is found to improve data rates when DSL line lengths differ. The results of fully optimized spectrum management are shown to be achieved, but without the need for full central control of spectra.