Getting FTTC on Monday. Currently on up to 8Mbps with Zen. I synch at 8064/448 Kbps since the ?17c change last October. Trouble is, it's less than stable and will often lose synch at odd times during the day (and night.) SNR drops below 6 then that's it. Also lots of errors. Interleaving is on at a depth of 32.
I've done all the usual things (test socket etc etc.) It's a dedicated line used solely for broadband - no phone attached. I think this may be caused by electrical interference caused by overhead street light cables passing about ten feet from the copper line from the phone pole. I can hear this using an AM radio.
Will this lack of stability get worse with FTTC? I say this on the basis of more speed equals less stability (as a general rule.) I'm aware problems between the exchange and cabinet will be more-or-less eradicated with FTTC but if the problem is what I describe above, I fear I might get an unusable line.