"If you've got a signal of +6 on your HSD carrier, you're going to run a little slow...if you have something like -10 or -11 on your HSD carrier, you're going to fly. You don't want to go anything lower than -13 though...and yes, the correct thing to do is use an directional coupler."
Bullcrap...It all depends on the quality of your downstream and upstream levels. Downstream 256qam with 34 or greater MER's is what is important with levels from +7/-7 dbmv. Upstream depends on your transmission level from 42-52dbmv with good port SNR of 28 or >
The DC or 2-way at the house is based up your tap value to achieve your desired level at the CMTS in your hub or head-end.
Re: Cable modem installation
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