Question about Apple Time Capsule 2TB

The Time Capsule can be connected to any modem with a WAN output. As far as I know, UPC no longer sells only the modem separately, but you get a router with an integrated cable modem. In this case, you can connect the Time Capsule via a LAN port (do not use the WAN port!). I configured the DHCP server on the UPC router and deactivated it on the Time Capsule, as only one router in the same network should be active as a DHCP server. In addition to the Time Machine backup, I also use the Time Capsule as an extension of my WLAN, with a different channel and the same SSID as the UPC WLAN router.

of course it should be called UPC modem...