An ADSS (All-Dielectric Self-Supporting) cable is a specialized fiber optic cable used for aerial installations, primarily on overhead power lines. Its name is its most important feature: "All-Dielectric" means it contains no metal, making it immune to electromagnetic interference (EMI) and safe for high-voltage environments. "Self-Supporting" means it is strong enough to bear its own weight over long distances without needing a separate support wire, which simplifies and speeds up the installation process.