Indeed, unfortunately the line has been banded presumably due to one or more of the following:
- Multiple resyncs in a short timeframe
- MTBR red threshold has been exceeded
- SNRM variance exceeded a certain threshold within a 24 hour timeframe (I believe this to be 4 dB) *
* I've noticed banding happens, without interleaving, when this occurs. The patent for the ADSLx DLM mentioned an SNRM variance threshold and in that document it was 4 dB. I believe this to be the case for VDSL2/FTTC as well.
I believe TalkTalk Business are part of the remote DLM reset trial, I'm not sure about TalkTalk Retail though.