I have BT infinity, and I've read people's comments about ''noise margin'. But never really understood the low and high values lol.
My current noise margin is "Noise margin "14.8 / 12.3". And I use to use a Cat 6 RJ11 cable which had a margin of 18. This is a custom cable from eBay.
Out of curiosity, is it a good thing to have a lower margin?