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32D-Link DSL-2540B ADSL2+ 4-Port Router User Manual
Section 7 - Advanced Setup
ADSL Tone Settings
The frequency band of ADSL is split into 256 separate tones, each spaced 4.3125 kHz apart. Each tone carries separate
data, so the router 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.