Armored OS2 SingleMode Simplex LC/SC/FC/ST 3. 0mm Fiber Optic Patch Cables are built with a protective armored layer that enhances durability, making them ideal for harsh environments where extra protection is needed. Besides, it is bending resistant, oil-resistant and wear-resistant. Therefore, the industrial armored cable is ideal for both indoor and outdoor applications. Armored Fiber Optic Cable, sometimes referred to as MC Fiber Cable or BX Fiber Cable, is optimized to protect your fiber cable, avoiding any and all unnecessary network downtime as a result of outside interferences.