I would like to start by saying that I have tried with my utmost knowledge/ability to figure this out before coming to a discussion board. I got rid of the Cox Panoramic Gateway, and bought 3rd part...
Hello Colleen, the Modem has LED indicators showing the current status. There is a LED that signifies either DOCSIS 3.0 or 3.1. When the LED is green, the current connection is 3.0, and when the LED is Blue, the current connection is 3.1.
User Guide explaining LED status.
Although my user ID and "credentials" are not able to be found, I am associated with a user who has no idea what I want to achieve haha. I can provide those details for you if need be.
Per the instructions of the SB8200 user guide, typing in 192.168.100.1 does not take me to any status screen. I believe this was due to activating the modem with Cox.
Basically, my equipment is not being used to it's fullest potential, when it absolutely should be.
The SB8200 User Guide listing steps for accessing status screen
Some routers like to completely flake out when you try to access a private IP address such as 192.168.100.1 when the device resides on a public interface. I suspect that's why you can't access the modem's status page.
Perhaps it's possible to establish a static route which directs traffic destined for 192.168.100.1 to your router's WAN interface.
As for the DOCSIS status indicators, it wasn't clear to me which channels on your modem status lights where blue vs. green. Keep in mind, not all areas have DOCSIS 3.1 on the upstream channels so you may see blue downstream but green upstream.