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 Maintenance
of underground telecommunication facilities
6.1 Inspection
6.2 Inspection items
6.4 Countermeasures
6.5 Inspection work safety
Appendix I – Experience with maintenance of cable tunnels in the Republic of
Korea
I.1 Typical deterioration
I.2 Frequency of inspection
I.3 Typical inspection items
I.4 Tunnel inspection by GPR
Appendix II – Non-entry inspection of maintenance holes
II.1 Non-entry inspection of maintenance hole with capturing images
II.2 Non-entry inspection methods