If your noise margin is "good enough", then you're not pushing the limits of your copper lines, and fastpath should be technically feasible (i.e. sufficiently low error rates), right?
Especially if you qualify for a higher speed tier, one would think you'd be eligible for fastpath on every other lesser speed tier (requiring much reduced sync-rates). And therein perhaps lies the problem?:
ATT never wants a customer presented with a choice between: paying more for the higher speed tier at interleaved, versus staying on a cheaper tier because (in addition to the cost savings) it gives them fastpath?
There must be some kind of marketing idiom about such a policy: the fear of 'feature tradeoffs' cannibalizing your highest margin products?
Excepting the expected eventuality of vectoring, it might be a theoretical opportunity 'some day', similar in theme to the small speed bumps within tiers: they could open up fastpath for folks with the stats to support it, delivering a welcome small improvement. (If an RG were rooted, could it be used to enable fastpath, or still likely to be locked out via settings in the VRAD cards)?
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