Hello!
I upgraded my service to 300mbps and Verizon sent me a cable and told me to connect from the Verizon Router to the ONT. So I connected it to Verizon's Router WAN port and I think the ONT's Ethernet port. I am not very cable savvy btw.
When I did this, the globe on the Verizon router started blinking red and no internet connection for devices. (On the router, I had only the WAN port connected to the Ethernet cable and the power supply cable.) When I reconnected the router back to the old coaxial cable, I was able to get internet so I didn't break router when I was trying to connect to Ethernet.
I have an Alcatel Lucent ONT - here is what the case looks like (I can't upload my own pics for some reason, and this is just an internet image). - https://forums.verizon.com/t5/image/serverpage/image-id/20929i3B0AAC854E003C78/image-size/large?v=v2&px=999
Here is what the ONT looks like and where that white cable is where I put my Ethernet cable into ONT (not my picture since I can't upload images).
https://forums.verizon.com/t5/image/serverpage/image-id/21509i26FDFFAACC9364BF/image-size/large?v=v2&px=999
Appreciate your help, thanks!