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

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3.3. Swapping and Advanced Swapping/Loading Methods

One of ADSL's most important and essential features is the bit-swapping described in [1]. Bit swapping accomplishes several features either crucial or desirable for DSL operation by:

  1. Allowing continuous response to line changes caused by environmental effects.

  2. Responding to changing crosstalk situations as other DSLs energize or deenergize.

  3. Allowing the data rate to be changed when/if desirable in some applications without restart.

  4. Allowing multiple DSL lines to be mutually compatible within power-spectral-density constraints.

  5. Enabling features such as the SRA described earlier.

The first two features are essential to proper operation of the DSL modem. DMT modems use minimal equalization, which ...

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