I'm not sure that I have ever had all tvs running, but there is one in each of the 4 bedrooms, one in the library, two in the basement, and one in the great room. the most we have ever had on at one time is 4, running on 4 different channels, two of which ere premium or pay-per-view...this is a bit odd I suppose, but i don'twatch tv except for the nat'l news.
The cable modem carrier signal is not affected by the number of tv's, however, as that is a completely separate waveform, so however many tvs tyou have running is immaterial. What I didnotice at the last place (beforethe move) was that as the neighborhood became saturated with more cable modem users, performance did degrade somewhat. I suspect the same thing will happen eventually in the new sub, although if you look at the amount of data a half dozen computers carrying even streaming data is, it isn't really much bandwidth.
CAT 5 cable, which is used for both phone and ethernet in the house, has the ability to carry two cable modem lines, or 4 telephone numbers (the guy wiring the place didn't know about the computers, and wanted to know why I needed 12 different phone lines in each of the rooms - lol). however, I ran each computer as a "home run" - that is it is point to point to the hub, rather than sharing lines, and that does make a performance/interference reduction difference.
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