64D-Link DSL-520B ADSL2+ Modem User Manual
Section 9 - Advanced Setup
Advanced Settings
Thefrequencybandof ADSL is splitinto 256 separate tones, each
spaced4.3125kHzapart.Eachtonecarriesseparatedata,sothemodem
operates as if 256 separate modems were running in parallel. The tone
range is from 0 to 31 for upstream and from 32 to 255 for downstream.
Do not change these settings unless directed by your ISP.
The test mode can be selected from the ADSL Advanced Settings page.
Testmodesincludenormal,reverb,medley,noretrain,andL3.Afteryou
makeyourselection,clickonApply to save these settings rst before
you go to Tone Selection.