D-Link P.DG A4001N A-000-1A1-AE User Manual page 65

Appendix A – Troubleshooting
Select the desired DSL test mode and then click the Apply button.
Click the Tone Selection button to modify the upstream and downstream
tones.
Select the appropriate upstream and downstream tones for your ADSL
connection. Click the Apply button to let your settings take effect.
4Port 2x2 wireless ADSL modem User Manual 65