10 training period is a myth on VDSL2
Agreed, that is to get a standard 6dB SNR/margin. However there is an ongoing training period that allows the drop to 5dB, 4dB and finally 3dB.
That's not an ongoing training period though.
That continues for the duration the line is active.
On FTTC the DLM is in effect from day 1.
While it can optimise the connection and lower the SNRM this can happen on day 10 or day 1,000.
The 10 day training period is specific to the ADSL DLM.
For whatever reason ISP's trot the same 10 day training period nonsense on FTTC.
It's a convenient excuse to brush off the customer for 10 days.
The same 10 day training period nonsense was given when FTTC launched back when every line started off on fastpath from day 0.
They continued to quote the 10 day training period for years before lower SNRM dB's were even a thing so it's stretching it a little to suggest that's the reason for a training period being mentioned.
Those on ECI cabinets with no lower dB SNRM's still get quoted the 10 day training period.
It simply doesn't exist on FTTC. It is a myth.
Edited by j0hn83 (Tue 30-Jun-20 19:12:05)