Recommendation ITU-T L.100 (01/2024) Optical fibre cables for duct and tunnel application
1 Scope
2 References
Summary
History
FOREWORD
Table of Contents
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Characteristics of optical fibres and cables
     6.1 Optical fibre characteristics
          6.1.1 Transmission characteristics
          6.1.2 Fibre microbending loss
          6.1.3 Fibre macrobending loss
          6.1.4 Fibre dimensions
     6.2 Mechanical characteristics
          6.2.1 Evaluation of mechanical characteristics
          6.2.2 Tensile strength
               6.2.2.1 Tensile ratings
          6.2.3 Bending
               6.2.3.1 Minimum bending diameter
          6.2.4 Crush
          6.2.5 Impact
          6.2.6 Torsion
          6.2.7 Vibration
     6.3 Environmental characteristics
          6.3.1 Evaluation of environmental characteristics
          6.3.2 Temperature variations
          6.3.3 Water penetration
          6.3.4 Moisture permeation
          6.3.5 Pneumatic resistance
          6.3.6 Freezing
               6.3.6.1 External freezing
               6.3.6.2 Freezing in a confined space
          6.3.7 Ageing
          6.3.8 Hydrogen gas
     6.4 Fire safety
          6.5 Biotic damage
     6.6 Electrical characteristics
          6.6.1 Lightning
          6.6.2 Electrical continuity
7 Cable construction
     7.1 Fibre coatings
          7.1.1 Primary coating
          7.1.2 Fibre buffer (secondary coating)
          7.1.3 Fibre identification
          7.1.4 Removability of coating
     7.2 Cable elements
          7.2.1 Fibre bundle
          7.2.2 Fibre ribbon
          7.2.3 Slotted core
          7.2.4 Tube (buffer tube)
          7.2.5 Micro-module
          7.2.6 Ruggedized fibre
          7.2.7 Strength member
          7.2.8 Water-blocking materials
     7.3 Sheath and jacket
          7.3.1 Moisture barrier
          7.3.2 Inner sheath (jacket)
          7.3.3 Outer sheath (jacket)
     7.4 Armour
     7.5 Identification of cable
     7.6 Cable sealing
     7.7 Considerations for duct installation
          7.7.1 Installation method
          7.7.2 Cable design considerations
Annex A  Test methods
     A.1 Standard test criteria
          A.1.1 Tensile strength of duct and tunnel cables
          A.1.2 Temperature test values for duct and tunnel cables
          A.1.3 Attenuation coefficient and changes (no change and allowable change) in attenuation/strain in cable testing
          A.1.4 Ambient temperatures for cable testing
          A.1.5 Temperature precision at extremes
     A.2 Test methods for cable elements
          A.2.1 Tests applicable to optical fibres
               A.2.1.1 Dimensions
               A.2.1.2 Coating strippability
               A.2.1.3 Compatibility with filling materials
          A.2.2 Tests applicable to fibre units
               A.2.2.1 Colour coding of fibre
               A.2.2.2 Fibre and unit identification
          A.2.3 Tests applicable to buffered optical fibres
               A.2.3.1 Dimensions
               A.2.3.2 Buffer strippability
          A.2.4 Tests applicable to buffer tubes
               A.2.4.1 Dimensions
               A.2.4.2 Tube kink
          A.2.5 Tests applicable to ribbons
               A.2.5.1 Dimensions
               A.2.5.2 Separability of individual fibres from a ribbon
               A.2.5.3 Ribbon strippability
          A.2.6 Cable element measurements
               A.2.6.1 Dimensions
               A.2.6.2 Cable diameter
               A.2.6.3 Sheath thickness
               A.2.6.4 Moisture barrier adhesion
     A.3 Test methods for mechanical characteristics of the cable
          A.3.1 Tensile strength
          A.3.2 Bending
          A.3.3 Bending under tension
          A.3.4 Repeated bending
          A.3.5 Crush
          A.3.6 Impact
          A.3.7 Torsion
          A.3.8 Abrasion of cable printing
          A.3.9 Kink
          A.3.10 Vibration
     A.4 Test methods for environmental characteristics
          A.4.1 Temperature cycling
          A.4.2 Ageing
          A.4.3 Longitudinal water penetration
          A.4.4 Moisture permeation
          A.4.5 Pneumatic resistance
          A.4.6 Freezing
               A.4.6.1 Freezing in an unconfined space
               A.4.6.2 Freezing of cable in a duct
          A.4.7 Material compatibility
               A.4.7.1 Procedure for ageing
               A.4.7.2 Jacket tensile strength and elongation testing – after ageing
               A.4.7.3 Metal coatings delamination testing – after ageing
          A.4.8 Oxidative induction time, OIT – for polyolefin filling and jacket materials
          A.4.9 Hydrogen
          A.4.10 Nuclear radiation
          A.4.11 Cable sheath adherence
               A.4.11.1 Test procedure
               A.4.11.2 Requirements
     A.5 Test methods for biotic characteristics
          A.5.1 Biotic damage
               A.5.1.1 Rodent and insect damage
               A.5.1.2 Fungus resistance of jackets
     A.6 Test methods for electrical characteristics
          A.6.1 Lightning
               A.6.2 Electrical continuity
Bibliography