OM3 LC ST Plenum Duplex Fiber Patch Cable, 10G Multimode 50/125 Aqua OFNP LC/ST Fiber Jumpers. The OM3 OFNP fiber optic assembly is a self-extinguishing, flame retardant, UV resistant, plenum rated, 50um Corning fiber core, zip-cord reinforced, ceramic ferrule LC and stainless steel ST termination (with lc duplex clips).