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DSL Advances by Peter J. Silverman, John M. Cioffi, Massimo Sorbara, Thomas Starr

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10.6. The Spectrum Management Classes

Early in the development of the spectrum management standard, a proposal was considered to specify a single 0-to-infinity PSD mask that would apply to all systems. Later it was determined that no such single PSD mask would suffice because it would have to be overly restrictive to protect the basis systems. Thus, it was determined that a family of more narrow-band masks would best way to specify an easy-to-use method of determining spectral compatibility.

The spectrum management standard T1.417 defines a set of nine spectrum management classes, whereby any DSL system that meets the PSD limitations, total average power limitations, longitudinal output voltage, and transverse balance requirements for any one ...

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