Fiber to the x (FTTX; also spelled "fibre") or fiber in the loop is a generic term for any broadband network architecture using optical fiber to provide all or part of the local loop used for last mile telecommunications. As fiber optic cables are able to carry much more data than copper cables, especially over long distances, copper telephone networks built in the 20th century are being replaced by fiber. The c. DefinitionsThe telecommunications industry differentiates between several distinct FTTX configurations. The terms in most widespread use today are: • FTTE () is a networking approach u. While fiber optic cables can carry data at high speeds over long distances, copper cables used in traditional telephone lines and cannot. For example, the common form of (1 Gbit/s) runs over r.