A distribution box is intended to aggregate and redistribute fibers within a structured cabling layer. It assumes upstream and downstream organization, labeling, and managed patching as part of a broader distribution hierarchy. "Two level protection" mainly refers to the use of leakage protection measures. In diagrams and BOMs, they are frequently grouped under “fiber boxes,” leading to the assumption that they differ only in form factor or. In FTTH, FTTB, and other fiber access networks, terms such as Fiber Optic Termination Box, Fiber Distribution Box (FDB), and ODF (Optical Distribution Frame) are frequently mentioned.