Outdoor fiber optic cable is optical cable engineered for unprotected external environments, distinguishing it from indoor cable through enhanced protection. These are the outdoor fiber optic cables you see strung along telephone poles (aerial), installed inside an underground duct, or even. Outdoor fiber optic cables are critical for building stable, high-speed networks in real-world environments. It affects performance, maintenance, cost, and reliability. For installations in harsh environments, outdoor armored fiber. What is an outdoor optical cable Outdoor optical cable, simply speaking, an optical cable used outdoors, is a kind of optical cable.