You probably have something using the rest of the bandwidth, but first, post the signal level page.
It's also possible that the modem is provisioned wrong
I will definitely bet on the last possibility, since the CM400 is good for 100 Mbps and CM600 is approved for 300 Mbps. However, the Netgear CM500 does NOT appear on Spectrum's list of approved equipment at any speed, so they won't have a 200/20 provisioning file for it. Chances are that they set it for 100/10 using their CM400 file instead.
MORAL: Don't buy an unapproved modem, despite the maker or seller claiming that it will work just fine on Spectrum.
Your service person speaks the truth. Spectrum only guarantees transport speed, and only while your data packets are being transported across their network. Once the data crosses from Spectrum to 'the internet' you are at the mercy of those transport carriers; any long-haul ping problems become your problem.
IF you can identify a malfunctioning Spectrum transport network device they will attempt to fix it promptly, but it is up to YOU to identify and report the suspected unit by its IP address.
I see that all of your downstream signal levels are out of the range they should be.
I also see high uncorrectables on all of the upstream channels.
I would encourage you to contact our Social Media Customer Care team to
schedule a follow up visit.
Please let them know that you have been in the Forums and that I have
recommended a visit. I will also note your account with my findings.
Spectrum-Social Media Customer Care
Lead Moderator-Community Forums
Get Spectrum out...
printout the above signal page for the tech, tell him there's ingress on at least ch 1
do a factory reset on the modem, see if you can get consecutive channels, post that here, then after a couple hours of up time, see if there's partial service errors and skipped channels.
print that out as well.
could be issues at the pedestal or anywhere along the street.
Having both bands can be helpful -- the 2.4GHz band has greater range but a lower top speed, the 5.0GHz band has shorter range and a higher top speed. The 5.0GHz usually has fewer interactions with neighbors, so if your device supports the 5.0GHz band, try using it first. If you have range issues, try the 2.4GHz band.
Also, you'll generally get better WiFi coverage and speed if you use your own wireless router (one with external antennas) rather than the integrated WiFi in the Spectrum modem/gateway device. To do this, you need to put the Spectrum device in bridge mode (you might need Spectrum to do this part for you) and insert your own router between the Spectrum device and your wired Ethernet connections (if you have any). Then you can drop the Spectrum WiFi service and save $5 per month.
You have a router with dual-band WiFi. The 5 GHz side can run much higher speeds, but some devices, wireless printers in particular, only have a 2.4 GHz WiFi radio which runs at slower speeds but has a stronger signal.
The only way you're going to get a complete list is to walk into the local office and ask them. Outside of that, if you use the combo but want to use your own router just have them put the combo in bridge mode. Or like msraye said, buy your own 6183 or a CM600.
How do I have permanent public IP for my home server?
You pay for a business-class connection...
Running a (web) server out of your home violates the TOS for residential service...