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risc19
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Docsis 3.1 Modulation & SNR

DOCSIS 3.1 recommended SNR

Modulation orderSNR
256-QAM≥ 29~30 dB
512-QAM≥ 31~33 dB
1024-QAM≥ 34~36 dB
2048-QAM≥ 37~39 dB
4096-QAM≥ 40~42 dB

 

The PLC signal level should be ≥ -15 dBmV

I thought this my come in handy when diagnosing.

My Broadband Ping - Virgin Lagfest Modem Mode