Broadband network architectures using optical fiber to provide all or part of the local loop for last-mile telecommunications are collectively referred to as Fiber to the x (FTTX). As fiber optic cables can carry much more data than copper cables, especially over long distances, they are increasingly replacing copper telephone networks built in the 20th century. The carrier equipment for FTTX is often housed in a fiber hut, point of presence, or central office.
FTTX encompasses several configurations of fiber deployment, divided into two main groups: FTTP/FTTH/FTTB (fiber laid all the way to the premises/home/building) and FTTC/N (fiber laid to the cabinet/node, with copper wires completing the connection). Residential areas already served by balanced pair distribution plant require a trade-off between cost and capacity.
Family Variants
Fiber reachesLast legFTTH (Home)Inside the homeNone; pure fiberFTTP (Premises)The property (homes and businesses)None; pure fiberFTTB (Building)Basement or comms roomIn-building Ethernet or VDSLFTTC (Curb/Cabinet)Street cabinetA few hundred meters of copper (VDSL)FTTN (Node)Neighborhood nodeUp to several kilometers of copper
Why the x Matters
Each step the fiber stops short of the home, handing off to copper, and copper’s speed collapses with distance, so the x determines the ceiling on what can honestly be sold at a given address. It also defines the upgrade path: full-fiber variants ride a PON whose electronics can be swapped for multi-gigabit tiers, while hybrid variants eventually require rebuilding the last leg entirely.
The Marketing Dimension
The FTTX spectrum is why fiber broadband became contested advertising language: hybrid services marketed under the fiber banner triggered the rise of full fiber as a differentiating claim. Regulators, from the EU’s VHCN definitions to national advertising authorities, now draw formal lines through this family. Knowing which x a footprint actually is remains the first fact-check of any broadband coverage or speed claim.