Deforming the coil of fiber into a U-shape is exactly what happens inside a standard box of cat-5, if you've ever opened one up. It's basically a figure-8 coil,

Deforming the coil of fiber into a U-shape is exactly what happens inside a standard box of cat-5, if you've ever opened one up. It's basically a figure-8 coil, folded into a U-shape and stuffed into the box. It pays out from the middle, just like any other figure-8 wrap.