A Fiber Distribution Unit (FDU) is a type of hardware that provides fiber cable management at termination points. Why do operators, designers, and installers use additional fiber optic hardware racks for cable and fiber management? The active electronics are the most expensive part of the. Optical Distribution Frames (ODF) are indispensable components in optical communications networks. The system can be deployed in multiple applications including: central office, headend, FTTx, FTTCS. Fiber distribution terminals play a crucial role in modern communication networks, providing a centralized location for the distribution of fiber optic cables.