I want to connect PC to Unifi's supplied modem with ethernet cable, but don't want to connect cable through router. Can it be done? How to do it?

I have no idea at all. Can tell me? Or point me to some webpage that shows how to do it?

I'm trying to find a way to do the modem-PC connection on my father's request. He doesn't want a router switched on in his house. He believes wifi signals will give him cancer. I know it doesn't but he is set in his beliefs and cannot be convinced otherwise. Anyway from my point of view, if not having wifi gives him peace of mind and makes him happy, then that's what matters.

My router has no antenna that sticks out

The fibre optic line comes into the house and connects to a Huawei Echolife HG8240H5 GPON Terminal. I called this the modem. An ethernet cable connects this to a Netis DL4480V1 AC1200 wireless dual band VDSL2 Gigabit VoIP IAD. I called this the router. Currently the PC is connected to this device through an ethernet cable.

So I'd like to find a way to connect PC to either the Huawei or Netis device via ethernet cable without having to turn on wifi. The Netis device has no visible stick antenna, so can't use the remove antenna method.

If I've got the modem and router terminology wrong, my apologies. I'm not very familiar with these things.

Please tell me how to do that.

Thanks a lot everyone!

Thanks for your suggestion. I successfully turned off the Netis router's wifi signals, while still having my PC connected to the router with a LAN cable.

Using my browser, I went to 192.168.1.1 and logged in with the default username and password. Clicked WLAN tab, went to WLAN0 (2.4 GHz) > Basic setting > Enable WLAN interface > Off. Then repeated the same thing at WLAN1(5 GHz).

Smartphone just use data