Agree with Mike only other thing I'd say is if you can force the modulation try between adsl2 and adsl2+, 2+ is double the frequency and can give you more interference on longer lines. You can also try to remove the ringwire, but the faceplate filter is an easier less fiddley option. I've also got a filtered faceplate at the master socket. I have also tried out a few RJ11 cables and have noticed a difference in the downstream att.
I''m sitting on a 61db and applying the faceplate filter, snr tweaking to a stable 6db and adsl2
ADSL Link Downstream Upstream
Connection Speed 2908 kbps 763 kbps
Line Attenuation 61.0 db 37.9 db
Noise Margin 6.2 db 6.0 db
On the advice of Mike i've ordered a 5M metre RJ11 to RJ11 Extension ADSL Modem Lead Cable. Looks better quality than the one I'm using and will see if it makes any difference to my connection. Every kbps helps when you live miles from the exchange!
Edited by deleted (Wed 08-Feb-12 00:13:01)