Also remember cumulative power (in any sense that matters) is the amount of RF power coming in through the tuner. The tuner may not be 8 channels wide (i.e. exactly 40Mhz). Remember the VMNG300 had a 126Mhz tuner, even though it "could" only use 20Mhz of the bandwidth, any channel power in the remaining 106Mhz would still be going through the downstream ICs, so you would have to add up the power of anything in that remaining space.
The average doesn't matter, it's the total that counts. Although mathematically the average and total are directly linked anyway...
---------- Post added at 05:56 ---------- Previous post was at 04:48 ----------
Quote:
Originally Posted by Sephiroth
Your SH currently sees a spread of 16 DS channels (each 8 MHz wide) in your set from which you can actually use 4 or 8 (or whatever VM set) according to the valid BPI+ key associated with your lease.
But all that stuff hits your SH and is sifted by the tuners. 16 = 2^4 so the aggregate downstream power is at least 4 x 3 dBmv = 12 dBmv (when the reported power is 0 dBmv).
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Ah, I see you've already covered this to some extent. Though I'm not sure how you know the SH's tuner is 16 channels wide. I can't find any info on it myself...