This Recommendation: makes a classification of different methods for inspecting and repairing underground ducts; describes both trenchless methods and conventional methods; is limited to the methods for underground ducts in which no cables are installed; focuses on methods for underground ducts thathave single-way duct unit systems and are made of plastic materials such as polyvinyl chloride (PVC) and polyethylene (PE); deals with pipes having diameters ranging from 90 to 110 mm.
ITU-T L.73-2008 Referenced Document
ITU-T L.1-1988 Construction Installation and Protection of Telecommunication Cables in Public Networks
ITU-T L.11-1988 Joint Use of Tunnels by Pipelines and Telecommunication Cables@ and the Standardization of Underground Duct Plans
ITU-T L.35-1998 Installation of Optical Fibre Cables in the Access Network - Series L: Construction Installation and Protection of Cables and Other Elements of Outside Plant Study Group 6; 10 pp
ITU-T L.38-1999 Use of Trenchless Techniques for the Construction of Underground Infrastructures for Telecommunication Cable Installation - Series L: Construction Installation and Protection of Cables and Other Elements of Outside Plant Study Group 6; 42 PP
ITU-T L.39-2000 Investigation of the Soil Before Using Trenchless Techniques Series L: Construction Installation and Protection of Cables and Other Elements Of Outside Plant Study Group 6
ITU-T L.40-2000 Optical fibre outside plant maintenance support, monitoring and testing system (Study Group 6)*， 2024-04-19 Update
ITU-T L.46-2000 Protection of Telecommunication Cables and Plant from Biological Attack Study Group 6*， 2024-04-19 Update