You must have two master sockets. One for each line. If I understand you correctly that's what you have, back-to-back with the wall in-between?
That makes sense as the incoming cable from outside has two or three pairs, for this purpose. It isn't really what you would call an extension cable between the two masters.
So I agree with what the others have said. If you haven't got a power point near the master in your room, you need the Home Wiring Solution
, (which used to be and often still is called a data extension cable
). This is free, but you need to make sure your ISP orders it automatically. Most do. That can be used in a few ways.
1) It can be wired into the existing master socket giving an extension somewhere else that only feeds the modem.
2) The original master can be turned into a simple junction box and the new master placed where you want it.
3) As (2) but with back-wiring within the cable to the original master which becomes a phone only extension. Not a recommended solution but works for people who have it in the hall and want a phone still to be there.
4) There will be other variations as well but (1) or (2) are the best technically for the fibre speed. Or of course you could provide power to near the current master in the first place, as the router can as far away from the modem as you like. That's the best of all.
My broadband basic info/help site - www.robertos.me.uk
| Domains,website and mail hosting - Tsohost
Connection - Plusnet
Extra Fibre (FTTC). Sync ~ 54.0/14.9Mbps @ 600m. - BQM
"Where talent is a dwarf, self-esteem is a giant."
- Jean-Antoine Petit-Senn.
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.