OM3 LC LC Plenum Duplex Fiber Patch Cable, 10G Multimode 50/125 Aqua OFNP LC Fiber Jumpers. OM3 OFNP fiber optic assembly is a self-extinguishing, flame retardant, UV resistant, plenum rated, 50um Corning fiber core, zip-cord reinforced, small form factor 1.25 ceramic ferrule LC termination with LC duplex clips.