In that case I would use some solid core Ethernet Cat6 or above and terminate it into the back of the vdsl filter faceplate and the other end upstairs into a single gang pattress box which you can then fit a rj11 faceplate to. The distinction is that the extension cable that goes into the front of the vdsl filter faceplate is stranded cable but if you want to do it the neat way with a socket upstairs that it would terminate to then you would use solid core Ethernet cable.



