I apologize for the question since it's been discussed several times on here. However, I can't make sense of those threads because I know very little about this stuff.
My modem's power level at the first jack/point of entry in my house is +12 dBmV downstream and 47 dBmV upstream. Downstream SNR is 38 dB for all 4 channels.
In the attic at night where it's ~80° F, downstream power level is +3 dBmV and upstream is 53 dBmV. Downstream SNR is 39 dB for all 4 channels. A 2-way/3.5 dB splitter connects the modem to the wall here.
How can I bring that upstream power level down to between 40-48 dBmV while maintaining the downstream power level, or bringing that closer to zero? A Comcast technician will come over in 4 days so I plan to buy whatever is necessary so he can install it for me (unless Comcast supplies their own?).
Unfortunately, my dad refuses to place the modem at the first point of entry. It must remain in the attic where it can climb to 90° F in Houston summers. Since December till last week, the modem was flawless. I suspect the change in weather (lot hotter now) has something to do with this. This is a relatively new 3-story house if it's pertinent.
Location: Houston, Texas
Modem: Motorola SB6141 (White)
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