This guide provides a detailed roadmap for locating and fixing fiber optic cable breaks, covering detection techniques, repair methods, and best practices. Construction Activities: Accidental damage during construction. Here are the steps to repair a cut fiber cable. The first step requires that you find the damage. With CommMesh's advanced tools and solutions, you'll learn how to restore networks seamlessly. These cables consist of a core (glass or plastic) that carries light signals, surrounded by cladding to reflect light inward, a buffer for protection, and an outer jacket for durability. Single-mode fibers (SMF).