Excessive bending causes light leakage from micro cracks in the fiber cladding, resulting in data loss and signal attenuation. In severe cases, tight bends can cause complete cable failure, making minimum bend radius compliance essential for successful installations. This application note reviews benefits of reduced macro. Fiber optic cable bend radius is a critical mechanical parameter that determines how sharply a cable can be bent without risking microbending, macrobending, signal loss, or long-term structural fatigue. It is measured from the inside of the bend, not the outer curve. Fiber optic cables transmit data through light propagation within a glass core. This was the world's first laser-optimized multimode.