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#95499 by lbmofo
Wed May 02, 2012 10:17 pm
murphy wrote:Connect to the status web page in your cable modem

Find the downstream and upstream power in dBmV and the Signal to Noise Ratio (SNR) and report back.

The downstream signal power should be between -10 and +10 dBmV. (Some say between -15 and +15 but I feel that is pushing your luck)

The SNR should be 35 or more.

The upstream power level should be less than 55 dBmV.

Apparently, Comcast has tightened the tolerances for DOCSIS 3.0

Signal to Noise Ratio (SNR): 32 dB - 50 dB
Power Level: -5 dBmV to 5 dBmV
Upstream Power: 32 dBmV - 50 dBmV

What do you think?
#95684 by lbmofo
Tue May 08, 2012 5:11 pm
Other than this guy saying it: ... 197#c_2162

A Comcast troubleshooter/higher level tech also has stated something similar to me about DOCSIS 3.0 modems needing a "cleaner" line.

Signal to Noise Ratio (SNR): > 35
Downstream Power Level: -7 dBmV to 7 dBmV
Upstream Power: < 50 dBmV

My dad's SNR was at 37, downstream power was at -1 dBmV, but because upstream power was at 53, the tech suggested that we run a dedicated line to another outlet (existing outlet has suspected bad inside wiring). We ended up taking the suggestion and got the upstream down to 47 (still not ideal for dedicated line because long outside wire + after splitter).

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