Here's how a typical set-up would look like in our homes. Please take some time to locate (A), (B), (C) and (D) before moving on to the troubleshooting steps below.
A: Power Adapter
B: ADSL Modem
D: Wall socket
Below would be the steps for troubleshooting:
Ensure ADSL Modem (B) is connected to the supplied power adapter (A).
Attach the cable from ADSL port at (B) DSL Port to Splitter port at (C).
Attach the cable from Splitter line port at (C) to the wall socket (D) using an RJ11 cable.
Ensure the ADSL Modem (B) power LED light is on. If you are still having connection issues, click here.