feeder distribution interface (local network) (FDI)
The term "Kabelverzweiger" (KVz) originates from earlier telecom times. It refers to a gray switch box that stands at the edge of the road as a street distributor. It is the point in local networks where the subscriber line( ULL) is split by the local exchange(OVSt) into several branch cables, for example for the connection to the end exchanges(EVz) or to the house connections. The cables from the houses are bundled in the cable splitters.
The connection between the local exchange and the cable distribution frame can be designed as a copper twisted pair or, in the case of higher data rates and greater distances, in optical fiber, while the connection between the cable distribution frame and the access box or VDSL modem can be designed as a copper twisted pair.
By moving the digital subscriber line access multiplexer( DSLAM) to the street cabinets or the basements of houses, the last mile is shifting in the direction of the customer.
-Foto-Telekom.png)
If the cable branch is connected with optical fiber, the optical network unit( ONU) in the cable branch provides the electro-optical signal conversion. This means that the route between the cable distribution frame and the end distribution frame can be implemented via copper twisted pairs.