OM2 LC ST Fiber Optic Cables | Plenum Duplex 50/125 Multimode Jumpers. OFNP Rated, multimode fiber (mmf) optical assembly with self-extinguishing plenum rated jacket, Corning 50/125u fiber cores and terminated with small form factor, 1.25mm ceramic ferrule, LC patch cable connectors and 2.5mm stainless steel ferrule, push and twist, ST fiber patch cable connectors.