Here's an odd thing. I was on the recent DLM trial and I've now got a fixed profile (interleaving off, SNR 6 both ways). Variations in sync speed are mainly determined by when the resync happens - faster in daytime, slower at night. I've been pretty happy with this, as I don't get the big swings associated with the DLM.
Usually, until recently, there's no variation in my upstream sync speed. It's normally 816 if interleaving is off (and it was a bit slower before and during the trial when interleaving was on). Since the end of March, though, after a resync it seems to have been going gradually down - not with every resync but maybe every second or third one. Each time, the speed drops by exactly 8kb/s. So I've gone from 816 to 808, then 800 and now (following what seemed to be a brief power interruption on the whole line this evening) 792. Upstream SNR is 5, as it always is.
I'm not (yet!) too worried about this, but is there an explanation?
Graham
