The Underground OFC can be buried directly underground or placed into a buried duct. The cables are ploughed in or buried in a trench when buried directly and the installation process can be very quick. The most common cables used for direct burial are steel armoured outdoor fiber cables. While underground duct installation can protect the cables from harsh environment and provides opportunity for future expansion without the need to dig. The other benefit is that fiber cables without armour can be used which makes the installation even easier.

Permanent ducts constructed by the State agencies along roadside may be available to lease for laying Optical Fibre Cable (OFC). The permission to use these ducts and review of utility will be done by the District Collector or Head of the concerned Local Authority.