Your downstream SNR at 6.4dB with line attenuation of 54.0dB is perfectly fine. You cannot go lower than that on SNR because of long line. If you reduced snr to 3.0dB then your line will be total unstable as plusnet wouldn't put u on snr of 3 because of line attenuation is way too high.
Best way is get this cable from here: http://www.tandyonline.co.uk/electronics/telecoms-ds... (0.5m is best for reduced line attenuation) plug this cable from BT Master Socket to your router. And get this faceplate too: http://www.tandyonline.co.uk/electronics/telecoms-ds... (these are the best professional high quality faceplate will also reduced your stable snr)
I use both of it cable and faceplate and had reduced line attenuation by 2dB off and the faceplate had reduced SNR and stay stable at 3.1dB for 72 days. My line attenuation was 30.0dB before was 32.5dB
Edited by adslmax (Thu 21-Nov-13 14:34:39)