An FTTH/X (Fiber to the Home / Fiber to the X) network is a high-speed broadband communication system that uses fiber-optic cables to replace traditional copper wires for all or part of the "last mile" connection to end users.

Fiber construction covers three broad situations that share the same documentation problem: backbone routes between cities, exchanges, data centres, and mobile sites; fiber-to-the-home rollouts made up of large numbers of short connections; and dedicated business or industrial connections to offices, factories, hospitals, campuses, and data centres.

The physical network is largely the same in all three. It includes fiber cables, main ducts and sub-ducts, chambers, handholes, cabinets, splice locations, road crossings, building-entry points, façade sections, indoor terminations, and connection points to other networks.

A single project commonly combines several installation methods. Open trenching may be used along one section, plowing along a rural roadside, horizontal directional drilling beneath a road, impact moling beneath a driveway, and existing ducts within an urban area.

Work is usually divided between several contractors and crews operating at the same time, across long rural distances on backbone projects, across hundreds or thousands of addresses on access projects, and inside controlled private sites on business connections. The final record must still form one continuous and coherent dataset.

Deviations from plan are normal. Routes change because of landscaping, underground obstacles, property-owner requirements, existing ducts, dense industrial infrastructure, or a different building-entry point than the one designed.

The main documentation challenge is therefore consistency: recording the actual installed route and every significant asset the same way across long distances, high connection volumes, and changing construction conditions.