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. The minimum bend radius defines the smallest. Although fibre optic cables have a certain flexibility, they cannot be bent every which way without consequences. Here is what one manufacturer's warranty says: "This warranty does not apply to normal wear and tear or damage caused by negligence, lack of maintenance. 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.