The only one I know a lot about is Be LLU, where everyone reckons the cut-off point is about 16Mbps download speed. So you are just above that.
At 16Mbps it comes out at not much upload increase, but 2.5Mbps download decrease
That's because the way Annex M works is to take the lower part of the downstream frequencies and use them for upstream. Those frequencies provide a lot of the downstream capacity, and it seems the higher frequencies are so attenuated at the attenuation that results in 16Mbps down that they can't compensate for the loss.
For some reason as well, when those lower frequencies are used for upstream, they too attenuate so much as to provide little
The higher the original Annex A downstream, the more benefit you get on upstream, and the less you lose from downstream. IIRC once the original Annex A downstream is above 20Mbps you get 2Mbps or more upstream and no downstream loss.
Re ISPs, Be as mentioned - on their Pro product, AAISP via both BT-based and Be-based I think, vivaciti are still Entanet resellers, as are Aquiss. I have a feeling Eclipse may do Annex M as well. There are probably others but those spring to mind.
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