Any way to adjust Cable Modem Downstream Power Levels?
My internet connection has been terrible for the past two months. I have had a technician come now and nothing has been resolve. After researching around the web, I believe the issue is due to the power level my cable modem is receiving (see attached). Are the power levels normal? If you're unable to see the picture, the power levels are all between -10 to -23.
Is there any way to adjust the power level?
Based on your screenshot, the connection between your modem and the Cox CMTS looks like it could be very noisy as suggested by your very low SNRs (i.e. 26.6 dB, 30.6 dB). Ideally, you want to see those SNRs at 36 dB or higher. You could start by trying to bypass as many, if any, splitters you have between your modem and the network termination point for Cox at your location and reseat your connections to the network termination point (demarc).
After that, if you find little to no change, the next Cox technician should show up with line testing and RF spectrum analyzing equipment to test and isolate the problem. Please be sure to ask for Tier 2 the next time you contact Cox Tech Support and share with them the very low SNRs you are seeing on your downstream channels. Good luck.