I have a five year old new build (3 story) townhouse. The master socket is located on the ground floor at the front of the property, with two extension sockets located at the front of the property on the first floor, and a couple on the second floor.
My cordless phones + ADSL router is located centrally on the first floor, which gives good coverage to the ground, first and second floors, and to the small back garden, and I typically receive around 15-17MB. My master socket just has a wired phone for emergencies.
Now I've been pondering upgrading my BT to FTTP fibre (other providers say that I cannot get FTTC), and I am aware that this may require the router be relocated to the ground floor via a new master socket.
In an attempt to see how this would affect signal quality throughout the house, I relocated my ADSL router to try it. However when I plugged it directly into the master socket, speeds dropped to around 6-7MB. I Unscrewed the master socket and exposed the test socket, and when I tried that, it reverted back up to full speed 15-17MB.
What does this imply? That when wiring my house, they somehow moved the master socket to the extension somehow? And how would it affect things if I upgraded to FTTP? Which floor would the router be located?