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Ah yes - I've seen a few of Adtran's presentations before. Of note is that their graphs indicate that the distances quoted are for 26AWG (0.4mm), and they can be multiplied by 1.3 when wires are 24AWG (0.5mm) - which is what we tend to have on the D-side here.
In that case, I'd have to take issue with your use of the word "best" then, as IgnitionNet corrected the bit about loop distance.
Because of what vectoring achieves (ie restores speeds back to the value you'd get as a lone user of a cabinet), then it certainly achieves the highest speeds for those closest to the cabinets, and the highest gain in speed. If, by "best", you mean fastest, then you are right.
However, vectoring continues to work effectively at distances far greater than 1kft (300m), as can be seen by other graphs in the same presentation. It is still having a noticeable effect (30% uplift) out at 5kft (1500m).
There are probably more people out there with speeds in the 10-40Mbps region, who will get uplifted, than those within 300m. The way you use "best" makes it sound like it will be ineffective for those people, when that is far from the truth. To my mind, vectoring is probably more "important" for people out beyond 600m. BT seem to be treating it that way too.
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