The way Lumen (née CenturyLink) typical install these units is to have a splice point outside in a box and then drill a hole inside and mount another cable mana

The way Lumen (née CenturyLink) typical install these units is to have a splice point outside in a box and then drill a hole inside and mount another cable management rig that the Calix snaps into. It basically feeds the fiber in from the back and you can catch a catch a glimpse of the white sheathing in the bottom corner as it loops from behind and into thr ONT.