[Sephiroth]

It's 16 channels that hit the modem and you tune to 4, 6 8 or whatever. The whatever doesn't matter.

If all the power levels were equal (say 23 dBmv which is really a small amount of milliwatts), then add 3d Bmv if the number of channels doublws from 1 to 2; add 3 dBmv if the number of channels doubles to 4; add 3 dBmv if the number of channels doubles to 8; add 3 dBmv if the number of channels doubles to 16.

Then 23+3+3+3+3 = 35

It's a sort of reverse logic based on 3dB increase doubles the power, You can see that's goota be right becasue if everyone was 2.1 dBmv with 16 channels coming in, you'd bust the power limit. Clearer?