Introduction
Annex A – Measurement of hydrogen
released by each cable component by gas chromatography
A.1 Principle
A.2 Equipment
A.3 Measurement procedures
A.4 Analysis
Annex B – Measurement of the
concentration of hydrogen in a cable sample
B.1 Unfilled cable
B.2 Filled cable
Annex C – Measurement of the
long-term effectiveness of hydrogen-absorbing materials
C.1 Principle
C.2 Apparatus
C.3 Measurement
procedures
C.4 Analysis
Appendix I – UK experience of
hydrogen concentrations in moisture barrier optical fibre duct cables
I.1 Field experience
I.2 Analysis
I.3 References
Appendix II – Japanese experience of
the loss increase due to hydrogen generation in water-blocking tape optical fibre cable
II.1 Structure and materials of the water-blocking tape cable
II.2 Hydrogen generated from cable components
II.3 Evaluation of loss increase due to hydrogen generation
II.4 Increase in loss in water-penetrated cable
Appendix III – Spanish experience of
hydrogen generation in moisture barrier optical fibre cables
III.1 Cable structure
III.2 Field experience
III.3 Origin of the problem
III.4 Problem solution