@mperry the DOCSIS 3.0 Downstream signal levels are high, still well within spec, but higher than normal. The signal to noise ratios are good. Typically those levels will be clustered around 0 dBmV with a signal to noise ratio in the 36 to 40 dB range. The operating range for DOCSIS is -15 to +15 dBmV. So, your downstream levels are within spec.
The upstream levels are also within spec. On this modem we're typically seeing somewhere around 30 to 32/33 dBmV. Yours are a little higher which suggests a possible noise issue in that frequency range. Those signal levels are will within spec as the maximum signal level for three channel DOCSIS operation upsteam is 51 dBmV.
The signal data shows that the modem is running DOCSIS 3.1 on the downstream side, so, the entire Downstream data table above is essentially irrelevant, interesting data but irrelevant. DOCSIS 3.1 runs 4096 subcarriers with a single frequency band instead of the 32 carrier frequencies with DOCSIS 3.0. That switch over to DOCSIS 3.1 does allow the modem to provide gig rates without issue. The one problem at this point is that the data shown in the user interface isn't entirely accurate. So, what I would recommend is a call to tech support to ask if the DOCSIS 3.1 OFDM channels are within spec. I would advise the CSR of the rates that you are experiencing and see what turns up. If the CSR indicates that everything looks normal, I would simply swap the modem for a CGNM-3552, as much as I hate to say that.
Fwiw, if you are a gamer, the CODA-4582 (Intel Puma 7) modem is a better modem to use as it doesn't suffer from the latency issues that the CGN3xxx modems suffer from. There was a firmware update in Sept 2016 that essentially took care of the latency for the CGN3ACSMR and CGNM-3552 for IPV4 ICMP and UDP. So, if you're gaming and running IPV6, as far as I'm aware, your still subject to that latency problem. My advice at this point for 4582 users is to keep using it if possible, but, if the data rate issue can't be readily resolved, swap it for a CGNM-3552 for now. When we know more about the data rate issue, users can return to the 4582.
Hope this helps 🙂
@BritesDW when your ethernet data rates are low, can you log into your modem, navigate to the DOCSIS WAN tab, copy the Downstream and Upstream table (top to bottom) and paste that data directly into a post. The copy and paste process will paste in the text contents of the table and it should look like the table itself when its pasted in. Ignore the data that resides above the Downstream table as it's modem specific.
