When the connection is syncing slower, the output power is also lower, as less tones are used.
Thank you for that clarification.. if you mean what I think you mean... then I tried to cover that in "Under performing lines that are capable of much higher speeds or not reaching their full potential will also show reduced power
If it meant something else it (less tones used) then that got me thinking on the question " if its tones in use or all available tones across the spectrum
".. so therefore if less tones = less power and knowing that the output should in theory be the same between syncs (ignoring the reserve for bitswap), then it would imply power is calculated across all tones regardless if in use or not.
A bit of digging in some router manufacturers documents, would seem to confirm at least some (all?) routers calculate across all the available tones in the spectrum.