Cheers Walter,
It's because of that very link to the face plate that I'm asking, and confused. Read so much recently about syncs, cables, filter and the rest that I'm getting overload lol.
The extension I installed myself into the back of my existing NTE5 face plate because I can't connect my router (or phone) to the master, hence the need for an extension. I want one of these filtered plates but as I can't plug the router into the master I'm confused as to whether it's redundant - can I fit one of these face plates to the extension upstairs?
The other thing I can't get my head around is if I have the ring wire connected. Definitely not on the master as I wired that but my master only has 2 wires connected, both of them orange.
I welcome any explanations