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Solved
CM500 status log for high db power on upstream
1 Locked ATDMA 53 5120 Ksym/sec 34800000 Hz 54 dBmV 2 Locked ATDMA 54 5120 Ksym/sec 27900000 Hz 54 dBmV 3 Locked ATDMA 55 5120 Ksym/sec 21000000 Hz 54 dBmV ...
Upstream power is still too hot (ideally should be dropped by 6 dB if possible). I think someone at the ISP side need to reduce one of the attenuators in the upstream direction.
are you facing any dropouts?
Looks like your ISP (most probably comcast) has enabled something called "Extended Upstream Power" on your account (which is good thing).
Knowing that your Cable modem literally need to transmit at such high power, it is probably because you have too many splitters in your home or you have too much attenuation in your RF line coming into your home