Recommendation ITU-T L.108 (ex. L.79) describes the characteristics, construction, test methods and criteria for microduct fibre units and microduct cables that are used with the blowing installation technique. The cable characteristics required for a cable to perform appropriately are described. Recommended test methods are described referencing to IEC 60794-5-10 and IEC 60794-5-20 to determine whether or not the cable has the required characteristics. The required conditions may differ according to the installation environment; detailed test conditions must be agreed upon between customer and manufacturer for the environment in which a cable is to be used. This revision aims to update the Recommendation format to be consistent with the latest L.10x-series.