GY - Optical cable for outdoor communication F - Non-metallic reinforcement X - Central loose tube T - Filling type Y - Polyethylene protective layer GYFXTY is a type of fiber optic cable suitable for outdoor installations. It is designed to be gel-filled, accommodate single mode fiber, incorporate FRP reinforcement, have a moisture barrier layer, utilize a PE outer sheath, and feature a fiberglass reinforced tape for added protection.