If you have Fibre to the Home, have a look at Fibre to the Home: Check your wiring and set-up for information.
Otherwise, follow the instructions below:
If you're having trouble with your broadband, a few simple checks can get you up and running again. First, you'll need to check your type of master socket. This is the main telephone socket where the phone line enters your home (usually found in the hallway near the front door).
Click on a link or picture.
My master socket has one socket >
My master socket has two sockets >