Johnatan56
Honorary Master
I do have another router, which I could test with later.
I'm not sure what the reason for the attenuation SNR contrast is. I noticed that when my area got its own exchange earlier this year (one of the new VDSL ones). The exchange is 300 meters away from my house.
YouTube test: http://puu.sh/kVOFa/e7df27cbb9.jpg
Try testing it with the other router and see if the line stats change. Do you have any noise on your line when making a call?
At 300m your SNR should be way higher, you should be able to sync at 40Mbps easy.