There are several threads around where people are being advised not to disconnect or re-sync during the initial 10-day training period, and that the DLM will seek out the best settings and possibly increase the speed during the period. One such advisor apparently being a BT FTTC installation engineer.
It has always been the case before FTTC that the above or similar advice is nonsense, even though peddled by BT Broadband support never mind all other ISPs. All the period does is set the MSR and FTR. It never of its own volition triggers a reconnection to achieve a sync increase.
I assume that it is also nonsense on FTTC. However there seem to be a number of reports on longer-installed FTTC lines of re-syncs occurring and the IP Profile rising almost immediately, after a previous fall, as though the DLM has been altered.
If the DLM in normal running has indeed been changed, then this could also be the case during the 10-day training.
Anybody actually know, as in quotable specifications, as opposed to what have been told by someone else, even a superior in BT, who possibly has it wrong?