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D-Link Wireless ADSL2/2+ 4-port Ethernet Router DSL-2640U User Manual

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The test mode can be selected from the DSL Advanced Settings page. Test modes
include—normal, reverb, medley, no retrain, and L3. After you make your

selections of the test mode, click on Apply to save these settings first before you
go to Tone Selection.

ADSL Tone Settings


The frequency band of ADSL is split up into 256 separate tones, each spaced 4.3125

kHz apart. With each tone carrying separate data, the technique operates as if 256
separate routers 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.