Fibre Optic Gateway

What is a fibre optic modem (ONU) and what do I need to know about having one?

How do I reset my fibre optic modem?

How do I check connections for a fibre optic modem?

What do the lights on my fibre optic modem mean?

Why can’t I use both Ethernet ports on the Sagemcom F@st 5681 gateway?