An armored optical cable is a type of fiber optic cable reinforced with a protective layer—usually corrugated steel tape (STA) or steel wires (SWA) —to shield the internal fibers from external threats such as crushing, rodent bites, moisture, and harsh installation conditions. With a durable protective layer, they are ideal for harsh or high-traffic environments. This article explains what armored fiber cables are, their key. These outer layers serve as the first line of defense against a plethora of potential hazards, ensuring the longevity, functionality, and efficiency of the cables they encase. Without robust protection, fiber optic cables are susceptible to environmental influences such as moisture, temperature. Cable jacket is the outermost layer of the cable, serving as the most important barrier for maintaining internal structural safety in the cable. It can provide mechanical, moisture-proof, fireproof, anti oxidation, and chemical protection for the conductors inside the cable, protecting the cable. Glass fibers are fiber optic cables through which light can spread unimpeded. The primary coating may be applied in a single or dual layer. In North America the National Electric Code dictates that this type of a cable jacket cannot penetrate any building by re than 50 feet.