. . . terminals 2 & 5 plus A & B on the back of my NTE2005 filtered faceplate . . .
Terminals 2 & 5 are for the (filtered) telephony connection.
Terminals A & B are for the (unfiltered) xDSL connection.
Looking at the PDF file for the socket you have purchased, I can see it is not what you were possibly expecting it to be. It certainly is not what I expected it to be. Let me explain . . . the terminal 2 & 5 should be supplied with an unfiltered signal. There is a low-pass filter within that socket which is interposed between between the 2 & 5 terminals and the telephone socket on the front of it. The 2 & 5 terminals are also directly connected to the xDSL socket on the front of it. The F2, F3 & F5 terminals are from where further telephone extension sockets may be daisy-chained. (They are provided with the signal via the low-pass filter, just like the telephone socket.)
To make use of that
Solwise ADSL-FFP85D socket, you will need just one twisted pair of a cable run between the
NTE5/A +
NTE2005 combination and the
Solwise ADSL-FFP85D socket. Then . . .
(1) Connect the
blue/white (or soild
blue) wire to the
B terminal of the
NTE2005.
(2) Connect the
white/blue (or solid
orange) wire to the
A terminal of the
NTE2005.
(3) Connect the
blue/white (or solid
blue) wire to terminal
2 of the
ADSL-FFP85D.
(4) Connect the
white/blue (or solid
orange) wire to terminal
5 of the
ADSL-FFP85D.
. . . and the job is done.
There is also a page in the
Kitz wiki that explains the
Internal Wiring colours.