Interesting, I wonder why. Did your attempts at sync capping in the other thread noticeably reduce the FEC count?
Something I have noticed though is I get a slight drop (by 1.0 dB) in downstream SNRM and one single upstream CRC error occurs each time I pick up the phone, then the SNRM returns to normal and a second CRC occurs upon hanging up. This is not causing me any issues so I will not be doing anything about it, but I'm just wondering if this is normal on VDSL2? I'm using a known good (on my old ADSL2+ line anyway) VDSL Mk3 faceplate for filtering. Perhaps if I ever upgrade to the 80/20 product and end up running at 3 dB target SNRM it might cause a problem as I'd then be dropping from 3 dB to 2 dB instead of 13.4 dB to 12.4 dB?
Yeah if you look at that thread I went from something like 20,000+ FECs an hour to about 10,000. Sorry I slightly over-exaggerated with the millions, although it doesn't take many days to get into the millions.
It's probably just a noisy line to be honest, I can't really be bothered to go into the reasons why, it's always been slightly baffling why I sync quite high on the downstream side of things for my line length (750m) but a bit low on the upstream side.
Your line is a bit shorter than mine but you'll see you have a higher upstream sync but a lower potential downstream. Doesn't make sense to me!
I wonder if 10,000 FECs per hour is the magic number and I would simply need to cap my DS sync more to see a benefit, might try that if I get bored.
Regarding the SNRM drop, it shouldn't do that. Sounds like the start of an HR fault to me.