dmt tool and netgear question

[#1]

i had an overnight problem appear with my speed dropping and line noise going up from 5bd to 12db
so i unplugged everything and put my spare netgear router in the master socket with a different micro filter .....
tried to use the dmt tool but it will not connect ( well it says connected but will not display values and cannot resync )  but works
fine with the other netgear router ... the only difference been the one that works is v4 and the one im trying to connect to is v2 ?
any ideas chaps ? 
model is  DG834g
thanks

[#2]

v2 is the wrong chipset

[#3]

is there a dmt download that will work on it jim ?

regards andy

[#4]

There is nothing which will allow you to tweak the noise margin.
If you just want to monitor it try Routerstats

[#5]

thanks jim ... i was after tweaking 
the older router has 3.5db lower line attenuation for some reason .....
not to worry ... i have the newer one running now and just waiting to see what plusnet say on a line test
connection is  over 1mb slower than normal( usually connect at 2500mb now its 1100mb) and the noise margin has risen to 12db from 4ish ...........
fingers crossed its a line fault as im plugged into the master socket and everthing else is unplugged