For your B4RN fibre connection the optical fibre will need to enter your home through a hole in a wall. Inside your home the fibre will be connected to a plate that will cover the entry hole and from there will be connected to a router that can cope with a 1000Mbps connection. You can start thinking about where in your home you would like the router to be and where you want the optical fibre to enter your home.
This is the box that is attached to the outside of your house that guides the fibre optic cable into your home.
Inside your home the fibre optic cable is connected to this connection box that covers the hole through which the cable entered your home. It is a little bit bigger than a light switch.