This small box (which can be mounted on the wall in a basement or a utility closet) translates the light signals from the fiber into the electrical signals that are necessary for the use of internet modems and WiFi routers. The fiber-optic network begins with access–high–high-capacity fiber cables that offer connection over long distances of central offices, data centers, and internet exchanges in a region of interest. These Backbone cables are a network that can convey enormous volumes of data in the form of pulses. A Fiber Access Terminal (FAT) is a key passive device used in FTTH (Fiber-to-the-Home) and other optical communication networks. In this article we'll break down how fiber internet is installed - from the network fiber drop outside your house to the in-home setup with your router and gateway - and what you should expect at each stage. It is widely deployed in FTTH, FTTB, and other access networks to ensure stable signal transmission from backbone cables to end.