MrSaffron gave it in short, or to be more precise wrote in English what Openreach say in their definition of FTTC. Specifically Section 2.2.1 of
this document.
See
this page about the BT Wholesale 10-day period on ADSLx. Note what actually happens at the end of the ten days.
That doesn't apply on Sky, who do start ADSL2+ LLU line at normally 4Mbps then ramp them up over a few days. TalkTalk I don't know, but have never heard it mentioned in relation to ADSL2+.
Nor, fairly obviously, can it really apply on FTTC, over which BT Wholesale have little control. The fault reporting speeds on FTTC are also determined by Openreach and are not set in any 10-day period.
I think you have been told this by someone at TalkTwaddle.
Re your error counts, remember on ADSLx the copper is used all the way from the exchange to you, with all the scope for problems that entails. On FTTC only the distance from the FTTC cabinet, (through the PCP), to you is copper.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
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