Computer Help and Support

So, you need an RJ35 port on the modem (pretty standard), a RJ35 (twisted pair) cable, and the similar port on the router.
RJ35: https://en.wikipedia.org/wiki/Registered_jack

The modems are generally only configurable at the host (cable company) end.

The router will probably have an input jack for the cable from the router. These are labeled differently, but the output jacks usually are 1,2,3,4,etc.

You'll need to follow the router's instructions to connect to the modem. Generally that may have to be done by direct-connecting a PC to the router (so there's no WIFI connection needed).

You should be able to get the router to be a WiFi hotspot, as well as a direct-connect (cabled). Printers and computers need to be told the WiFi login/password (which you'll establish).

It's tricky and sometimes breaks for no apparent reason. But when it works, it's magic. My partner and myself use both printers and other peripherals from anywhere in the house from multiple devices without problems.

Now, to pull out a good book to read tonight!