Recommendation ITU-T L.201 (05/2021) Performance requirements for passive optical nodes: Sealed closures for outdoor environments
Summary
History
FOREWORD
Table of Contents
Introduction
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Design characteristics of optical closures
     6.1 General requirements
     6.2 Design of the closure housing
     6.3 Closure materials
     6.4 Design of the optical fibre organizer (fibre management system)
          6.4.1 Characteristics of the optical fibre organizer (fibre management system)
          6.4.2 Configurations of the optical fibre organizers (fibre management systems)
7 Performance evaluation test programme
8 Sample preparation
Annex A  Performance evaluation criteria
     A.1 Sealing evaluation
          A.1.1 Pressure loss during the test
          A.1.2 Tightness after test
          A.1.3 Visual appearance
     A.2 Optical performance evaluation
          A.2.1 Change in attenuation (change in insertion loss) (static optical stability)
          A.2.2 Transient loss (dynamic optical stability)
Annex B  Performance test programme for outdoor subterranean or underground (OS) closures, ground level (OG) closures and above ground (OA) closures
     B.1 Sealing evaluation
          B.1.1 Cable axial tension
          B.1.2 Cable flexure
          B.1.3 Cable torsion
          B.1.4 Impact
          B.1.5 Static load (crush test) (OG and OS only)
          B.1.6 Vibration (sealing)
          B.1.7 Waterhead (OS and OG only)
          B.1.8 Resistance to aggressive media
          B.1.9 Resistance to detergents (stress cracking) (OS and OG only)
          B.1.10 Resistance to corrosion (salt fog)
          B.1.11 Change of temperature (OS)
          B.1.12 Change of temperature (OA and OG)
          B.1.13 Re-entries
          B.1.14 Cable axial compression
     B.2 Optical performance evaluation
          B.2.1 Cable axial tension
          B.2.2 Cable flexure
          B.2.3 Cable torsion
          B.2.4 Intervention at a node
          B.2.5 Vibration (optical)
          B.2.6 Shock
          B.2.7 Change of temperature (OS)
          B.2.8 Change of temperature (OA and OG)
Appendix I  Product characterization checklist
Appendix II  Ukrainian experience
     II.1 Introduction
     II.2 Dimension and optical characteristics
          II.2.1 Visual inspection
          II.2.2 Dimension
          II.2.3 Bend radius of optical fibres on the cassette
     II.3 Environmental characteristics
          II.3.1 Temperature cycling
          II.3.2 Temperature: Heat durability
          II.3.3 Temperature: Cold durability
          II.3.4 Resistance to aggressive media
          II.3.5 Corrosive atmosphere
          II.3.6 Water penetration
          II.3.7 Freeze/thaw
     II.4 Mechanical characteristics
          II.4.1 Axial tension
          II.4.2 Vibration
          II.4.3 Torsion strength
          II.4.4 Bending strength
          II.4.5 Impact
          II.4.6 Static load
          II.4.7 Drop
          II.4.8 Ultraviolet resistance
     II.5 Field condition tests
          II.5.1 Re-entry
Bibliography
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