A Fiber Optic Termination Box is a small enclosure located at the terminal end of the fiber where it enters your customer premises. It is widely deployed in FTTH, FTTB, and other access networks to ensure stable signal transmission from backbone cables to end. A Fiber Access Terminal (FAT), also known as a Fiber Access Terminal Box (ATB) or Fiber Distribution Terminal (FDT), is a key component found in optimized fiber optic access networks for FTTH implementations. A typical PON topology (GPON, XGS-PON, or 25G PON) flows OLT → fiber distribution hub → passive splitters → distribution/drop fibers → premises.