Re: what are ideal power levels and snr
When 8 channels arrive, the lower frequency channels should have a higher power level than the higher frequency channels. Attenuation at higher frequencies riser faster with distance than lower frequencies. So you may see a c. 2 dBmv gap between the highest and lowest power levels. Nothing to worry about. The SNR isn't affected by the number of channels.
Have a read of the attached document. It explains how 11 dBmv on each channel can bust the modem; -1 dBmv won't bust it.
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Seph.
My advice is at your risk.
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