The NTE5 is your actual Master Socket and the filter is before that? Or you have something else as your Master Socket then the NTE5, which is what your previous message implied. Or am I reading that wrong?
My master socket is the NTE5.
Yeah, the NTE5 is the master, but there's an inline filter before the NTE5, I've taken some pictures:
The filter exterior
The black wire is the incoming from the DP, the white goes off to the NTE5 Master.
Orange/white pair going into the coil, then to the blue/brown pair to NTE5.
NTE5 with V1 ADSL faceplate
Engineer install master socket and NTE5
I had to mount this, thankfully the template was accurate
ECI Box Label
In case anyone is bothered