steluci ok
You stated on your first post, that you have a DSL-Version.

I am not a Sunrise employee, so I am not able to figure out what type of Connect Box 3 you are talking about.
If you have a Connect Box 3 HFC, that’s the one connected to the TV-outlet. You’ll see Modem Mode once IPv4 is activated. To my knowledge that’s the only version of the Connect Box 3, that offers Modem Mode.