http://whrl.pl/RbTWf4Tried the C10 and Jacksons and an HPM RFI and EMI filter, even shielding on the phone line, baums, load balancers and ferrite cores in desparation but ACS brand inline filter for some reason just cuts it above all the rest and is better alone on the line.
Dunno what an inline filter means there but I hope it helped.
Edit: Seems the VMG1312/8324/8924-B10A
have it, for example. If an inline filter on the way to the modem can be improved/added (no idea), it should help with errors but from my knowledge has the effect of slightly "extending the line", so the "max attainable sync" would be from an
irrelevant bit to a
considerable bit lower. But, it's proven to help with errors, and its impact on real-world speed can be positive,
if there were errors at the current sync, or preventing from syncing higher. (or if it's a bad filter, it might only be detrimental to everything
).
See also:
https://kitz.co.uk/adsl/rein.htmEdit2: @j0hn True, but a filtered faceplate also has an inline filter. I wasn't suggesting what filter to buy. AFAIR, I'm still using ADSL2 filters on my VDSL2 and have the stats you've seen.
Seeing what this guy said, it makes sense.