15/10/2026
“What’s that grey box on my wall?”
It’s where your full fibre arrives at your home. The fibre cable comes from the street, either down from a telegraph pole or up from underground, and finishes in that grey box. Inside it, our engineer joins it to a second fibre cable, which goes through a small 10mm hole in your wall and into the house.
Indoors, that cable plugs into a small box called the ONT (optical network terminal). The ONT turns the light signal coming down the fibre into something your router can use, and the router does the Wi-Fi bit.
So the grey box is basically the front door for your broadband. It protects the join where the cable reaches your home, which helps stop problems further down the line.
Best thing to do with it? Leave it be.
If it ever gets knocked or damaged, give our team a shout on 0800 059 0980.
