That's not an acceptable answer, just I know best, with no explanation or evidence.

Evening All,

Apologies for the delay in replying. Just been catching up on the comments and thought it would be a simple question.

Thank you for all the comments. I think I will try both pairs (if I have time) and see if there is any difference. I don't expect there to be much difference but I thought someone may have tried this previously.

Just to clarify, there is currently a master (not SSFP) and I will just run an extension which will be a simple BT extension (with BT 431A socket) which is where the router will plug into - nothing fancy (also have a deadline so not much time to go back and forth testing different setups).

Thanks again.

/thread closed..

From the OP’s last post ….

Just to clarify, there is currently a master (not SSFP) and I will just run an extension which will be a simple BT extension (with BT 431A socket) which is where the router will plug into

That set up will produce a bridge tap. There will be errors, and the occasional drop out.