Cable Modem Signal Levels
Here is a Sticky for 50Mb power levels across all platforms
Downstream
* Knowsley networks using QAM64 are: -7 to +3 dBmV.
* Knowsley networks using QAM256 are: -3 to +7 dBmV.
* Langley & Bromley networks using QAM64 are: -10 to 0 dBmV.
* Langley & Bromley networks using QAM256 are: -4 to +6 dBmV.
Upstream
* Upstream signal levels (from the modem) should be between 34 and
55dBmV.
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