What does the designation MLD TDT U DQH (ZN) BH indicate about the cable construction?

The designation breaks down as a metallic loose tube / tight-buffered hybrid design with a flame-retardant outer sheath. ‘MLD’ refers to the metallic loose tube, ‘TDT’ indicates the tight-buffered element, and ‘U DQH (ZN) BH’ specifies armoring, water blocking, and halogen-free flame-retardant properties. This hybrid construction combines the robustness of loose-tube fibers for mechanical isolation with the flexibility of tight-buffered fibers for easy termination, all housed under an outer jacket that meets strict fire-safety requirements for indoor and outdoor commercial installations.