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The Protection of Telecommunication Lines and Equipment Against Lightning Discharges (Chapters 9 and 10)

image of The Protection of Telecommunication Lines and Equipment Against Lightning Discharges (Chapters 9 and 10)

The Handbook “The protection of telecommunication lines and equipment against lightning discharges” was originally published in 1974, followed by the publication of additional Chapters 6, 7 and 8 in 1978. The ITU-T Study Group 5 has now prepared further new Chapters 9 and 10: Chapter 9 on fibre optic cable lightning damage assessment and Chapter 10 on overvoltages and overcurrents measured on telecommunication subscriber lines.

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Fibre Optic Cable Lightning Damage Assessment

An optical fiber cable containing metallic components is susceptible to lightning damage for both aerial and buried constructions. Two theoretical methods to calculate the annual frequency of fiber damage due to lightning effects, are presented. All the graphs, etc., needed for one of the methods, are given; a numerical integration is necessary for the other. The annual damage rate estimates thus obtained can be used to quantitatively compare route system design and optical fiber cable design alternatives. The algorithms are given for improvement gained by route redundancy, shield wires and joint use with power lines.

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