The FTTB technology, Fiber to the Building (FTTB), is a fiber optic connection technology( FTTL) in which the optical fiber is routed from the exchange in empty conduits to the equipment room of buildings and terminated there with a Digital Subscriber Line Access Multiplexer ( DSLAM), a Multi Dwelling Unit ( MDU) or the Fiber Optic Termination Point(GF- AP).
In the building, the optical signal from the Gigabit- PON passive optical network is converted via the optical network unit( ONU) into an electrical signal that is routed via the copper cabling present in the building to the subscriber line( TA). The transmission technology used is VDSL or VDSL2. Between 8 and 16 broadband access points are available.
The bridgeable distance is around 500 m; the transmission speed depends on the DSL method and can be 100 Mbit/s in the downstream. In contrast to the GPON concept, an Ethernet-based approach offers better scalability. Therefore, FTTB solutions are suitable for small and medium-sized companies, whereas Ethernet P2P solutions are better suited for large enterprises due to higher flexibility and bandwidth symmetry. Like Fiber to the Curb( FTTC), Fiber to the Building (FTTB) is mainly installed in urban areas.