Our NTE5's are made by the same people who supply BT, they are the latest revision with the bell wire filter that can improve ADSL performance.
Installing an NTE5 is very easy, first off we should point out that officially speaking you should not fit the NTE5 directly to BT's wiring (the wiring that comes from outside the building). However you are very unlikely to get into any trouble over fitting one yourself. Here is what an NTE5 consists of :-
The front lower plate comes off :-