Downstream Overview Port ID Frequency (MHz) Modulation Signal strength (dBmV) Signal noise ratio (dB) Channel ID 1 633000000 256QAM 3.400 40.366 6 2 591000000 256QAM 2.900 38.983 9 3 597000000 256QAM 3.800 40.366 1 4 603000000 256QAM 4.100 40.946 2 5 609000000 256QAM 3.300 40.946 3 6 615000000 256QAM 3.300 40.366 4 7 621000000 256QAM 3.200 40.946 5 8 639000000 256QAM 3.300 40.946 7 9 645000000 256QAM 4.100 40.366 8 10 651000000 256QAM 4.500 40.366 10 11 657000000 256QAM 4.700 40.366 11 12 663000000 256QAM 4.600 40.366 12 13 669000000 256QAM 4.200 40.366 13 14 675000000 256QAM 4.700 40.366 14 15 681000000 256QAM 5.300 40.366 15 16 687000000 256QAM 5.300 40.946 16 17 693000000 256QAM 5.600 40.366 17 18 699000000 256QAM 5.400 40.366 18 19 705000000 256QAM 5.400 40.946 19 20 711000000 256QAM 5.800 40.366 20
Your signal levels and signal to noise ratios for the cable feed are fine. They are a little high, but thats okay, as they will slowly drop over the next few years as the cable and connectors age. The most that I ever saw from my CGN3 on a 2.4 Ghz network is about 105 - 110 Mb/s. The 5 Ghz will top out around 200 Mb/s.
Just to check the wifi environment where you live you could install a program like inSSIDer. By looking at at, you, or we should be able to determine how tough it will be to see higher data rates. The link below is to the last freebie version of inSSIDer. It will monitor both 2.4 and 5 Ghz networks, but it does not display the newer 802.11ac networks which run in the 5 Ghz band. The network display will show both in list form and graphically, how many other routers are running nearby, and from the graphical display it is possible to determine if there are better channels to be operating on that might yield higher data rates. If your laptop is 5 Ghz capable, you should notice a significant difference in the number of 2.4 Ghz networks running versus the number of 5 Ghz networks running. That might give you some idea that the 5 Ghz band is a better place to be operating. If you load the application, take a screen shot of the network display and post it somewhere that we can have a look at it, we can tell you how easy or difficult it might be to switch channels.
Here is a link to the new version which has since become a pay version. For $20 U.S., if you run networks in the 5 Ghz band, its worth buying.
FWIW, I just upgraded from 150 Hybrid to 250u Ignite. (Still using the same CGN3)
I am wired and when I ran OOkla speed test I was consistenly getting only about 100Mb
I checked the properties of my NIC and found that "Jumbo Frames" was enabled.
As soon as I disabled "Jumbo Frames" speed tests consistently run at about 310Mb
And that is why troubleshooting problems can be very difficult sometimes. These range from problems that come up over time, cabling and connectors deteriorating as they age, to problems with advanced settings, such as the one that you found. Its a pretty wide range to sort through. Good catch. I never would have thought of that at all. Definitely something to keep in the back of my mind during future troubleshooting sessions 🙂
We ran into some jumbo frames issues at work (and this is on HIGH END equipment, not stuff like the CGN3, etc).
Its quite possible that it doesnt support it at all.
The one issue we had at work was.. that it DID support jumbo frames.
BUT, not at the FULL values.
The packet headers, due to the network, etc... had a bigger packet, which was actually pusing it over the jumbo frame full size, causing an error.
Droping the size down to JUST under the full amount, making room for the header.. and its been fine.
Something like that COULD possibly work as well in these settings.
Though, unless you are running a server type machine, with a TON of I/O through it, i really dont think it would make a difference 🙂
I remember I had the same problem when I first got the package. How I resolved it was by changing my cables to CAT6 cables. That fixed the download speed cap problem. Do try that and see if it fixes the problem for you.