Recommendation ITU-T L.209 (02/2022) Requirements for fibre optics network terminal box (FONT)
Summary
History
FOREWORD
Table of Contents
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 Description
     6.1 Box design
     6.2 Environments
     6.3 Operational temperature ranges of the electronic equipment
     6.4 Sealing against ingress of solids and fluids
     6.5 Materials
     6.6 Mechanical protection
     6.7 Electrical powering
     6.8 Antennae requirement (optional)
7 Safety
     7.1 Electrical safety
     7.2 Laser safety
     7.3 Electromagnetic compatibility
          7.3.1 Environmental EMC classification
          7.3.2 Earthing and bonding
          7.3.3 Resistibility (overvoltage/overcurrent conditions)
8 Performance evaluation test programme
     8.1 Sample preparation
Annex A  Performance evaluation criteria
     A.1 Mechanical, sealing and thermal management evaluation
          A.1.1 Sealing performance
          A.1.2 Visual examination
          A.1.3 Solar radiation-thermal management
     A.2 Optical evaluation
          A.2.1 Change in insertion loss (attenuation) (static optical stability)
          A.2.2 Transient loss (dynamic optical stability)
     A.3 Wireless compatibility test on box with antennae (optional)
Annex B  Performance test programme for box
     B.1 Mechanical, sealing and thermal management evaluation
          B.1.1 Static load (crush test) on the top of box (for OA and OG)
          B.1.2 Static load on box door (optional) (for OA and OG)
          B.1.3 Resistance to side load (for OA and OG)
          B.1.4 Cable retention force
          B.1.5 Cable bending
          B.1.6 Cable torsion
          B.1.7 Impact
          B.1.8 Temperature cycling
          B.1.9 Re-entries
          B.1.10 Salt mist
          B.1.11 Solar radiation – Thermal management (for OA and OG)
     B.2 Optical evaluation
          B.2.1 Intervention at the box
          B.2.2 Vibration
          B.2.3 Shock
          B.2.4 Temperature cycling
     B.3 Material evaluation
          B.3.1 UV light resistance
          B.3.2 Mould growth (fungus resistance)
          B.3.3 Resistance to aggressive media
     B.4 Wireless compatibility test on box with antenna (optional)
Appendix I  Example of typical FONT structures
Appendix II  Product characterization checklist
Bibliography
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