163 describes criteria for the installation of optical fibre cables defined in Recommendation ITU-T L. 110 in remote areas with lack of usual infrastructure for installation including the procedures of cable-route planning, cable selection, cable-installation. This article gives an overview of this technology, which enables road-surface wiring by installing optical-fiber cables in grooves formed on asphalt pavement. Challenges with optical-cable-laying technology Installing optical-fiber cables for telecommunications requires either constructing. On sections between stations and on minor station sites, the fiber optic cable is usually laid within the railway right-of-way, which typically extends approximately 50 meters on either side of the railway track centerline. Preference will be given for Horiz ntal Directional Drilling (HDD) wherever. Horizontal Directional Drilling (HDD) is an efficient, trenchless method for installing underground HDPE ducts and Emtelle's FibreFlow microduct bundles.