There are three methods that you can use to the connect the Orbi satellites with the Orbi router with the Ethernet cable (LAN).
One Satellite to Router Link
Place one satellite on your desired place in home close to your router. Now use the Ethernet cable and connect its end to the router’s LAN port and Satellite’s port. Now you can turn on your devices and can use the extended Or... https://orbi-satellite.com/