Key players, including nVent Electric, Belden (PPC), and Fujikura Ltd. Manufacturers design fiber optic cabinets to protect fiber optic cables in indoor and outdoor environments. Inside this secure enclosure, multiple. Incorporating Clearfield's philosophy of modularity and flexibility, the FieldSmart ® Fiber Distribution Hub (FDH) sets the bar for fiber access, protection and density among outside plant fiber cabinets for PON, cross-connect or hub collapse environments. It safeguards connectors and adapters from dust, moisture, and mechanical damage.