It looks like you can still use it strictly for modem duties and use your existing router. That's what I do (albeit with AT&T fiber), and the only downsides are you have to port forward on both the "modem"/C5500XK and your router, and things like dynamic DNS is potentially more complicated to setup.
It looks like you can still use it strictly for modem duties and use your existing router. That's what I do (albeit with AT&T fiber), and the only downsides are you have to port forward on both the "modem"/C5500XK and your router, and things like dynamic DNS is potentially more complicated to setup.