Hi
BBN,
Somewhere, I do have an image from an official
Openreach document that shows the "Data Extension Kit" being used to carry the VDSL2 signal from the
SSFP at the
NTE to a newly installed socket into which the VDSL2 modem is plugged. Hence it shows exactly the situation you wish to have implemented. So, in answer to your first question, there should be no problem. Just explain to the installing engineer exactly what you would like. (In parenthesis, I'll say that the "Data Extension Kit" cable is a Cat5e cable and so is perfectly capable of being used in either scenarios -- as an extension between the
SSFP and the modem or as an extension between the modem and the router.)
My current knowledge is that very few (a tiny minority) users have replaced the official
Openreach modem (currently classified as part of the
Openreach network and not to be replaced, according to the service T&Cs) with their own devices. As for the router, you are in the "free for all" territory. Your ISP provides you with one. It is up to you if you actually use it.
In your case, as you are migrating to
BT Infinity, you will be provided with a
Home Hub 3. As long as it is the newer
Type B, it should operate well. (I have heard that the earlier
BT HH3, Type A is a bit of a "pig's ear", performance wise.)
At a personal level, if I were migrating to
BT Infinity, I would say "
Thank you" for the
HH3 and promptly stash it away in my grotto. In its place, I would use a
2Wire 2701HGV-C -- which is also known as the
Type 2 BT Business Hub, Version 3.0. Why? Because I am an enthusiast for the
2Wire hardware.