I use this replacement filter that kindly provided by my operator. I'm VDSL, a few dozen meters from the center and I could have lost daily timings and a very variable rate (5 to 20 Mb / s to a few seconds apart).
This filter has corrected the problem of loss of synchronization and the flow is almost constant. I solved my problems flow "insufficient" by giving me this cable:; psc = 1 and I can now enjoy my 45 Mb / s fluid and stable manner.