I have a newly installed BT master socket with a clip-on Mk4 faceplate. The telephone extensions are wired directly to two screw terminals on the master socket backplate, not plugged into the faceplate. Is this correct? How are they filtered? Isn't the filter in the faceplate? I thought the whole point is that they would be filtered by the faceplate filter. What am I not understanding here?
Solved! Go to Solution.
They should be connected as shown here, nowhere else, as they are the filtered terminals.
This is what I've got. Which I think is the save as what you're showing.
that's where your extensions should be wired
Later ones were white.
That should only be your extension wiring. You can prove this by leaving the front plate off, then plugging a phone into the test socket at the top.
You should get dial tone at that test socket. If you do not, then the socket is incorrectly wired.
As @imjolly has said, the only wires connected to that white block, should be the ones going to your phone extension. There must be no incoming wires from the external network connected to that block.