D-Link DSL-2750 - DSL Test

79D-Link DSL-2750B Wireless N300 ADSL2+ Modem Router User Manual
Section 3 - Conguration
DSL Test
WAN
Connection:
Select the connection from the drop-down menu that you
would like to test. Then Click Run Diagnostic Tests to run the
test.
The DSL section provides a way for you to test your DSL connection.