4RU Ultra High-Density rack mount enclosure, which can house 48 pcs UHD series MPO modular cassettes or fiber adapter panels. It provides high density flexible system for managing fiber terminations, connections, and patching in data center application to maximizing rack space utilization and minimizing floor space. UHD fiber optic enclosure houses, organizes, manages, and protects fiber optic cable terminations. The 1U enclosure houses 12 independently sliding drawers, each drawer can hold 4 UHD MPO cassettes by default.