International Telecommunication Union

ITU is the United Nations specialized agency for information and communication technologies, responsible for allocating global radio spectrum and satellite orbits, developing technical standards to ensure network and technologies' interconnectivity, and works to improve access to ICTs to underserved communities worldwide.

Place des Nations
1211 Geneva 20
ITU
Switzerland

Website: https://www.itu.int
Email: itumail@itu.int
Tel: +41 22 730 5111

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Series details	Title	Year	Status
Recommendation ITU-T K25	Protection of optical fibre cables	2000	Withdrawn
Recommendation ITU-T K46	Protection of telecommunication lines using metallic symmetric conductors against lightning-induced surges	2008	Withdrawn
Recommendation ITU-T K20	Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents	2008	Withdrawn
Recommendation ITU-T K20	Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents	2011	Withdrawn
Recommendation ITU-T K20	Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents	2018	Withdrawn
Recommendation ITU-T K20	Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents	2019	Current
Recommendation ITU-T K21	Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents	2008	Withdrawn
Recommendation ITU-T K21	Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents	2011	Withdrawn
Recommendation ITU-T K21	Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents	2018	Withdrawn
Recommendation ITU-T K21	Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents	2019	Current
Recommendation ITU-T K46	Protection of telecommunication lines using metallic symmetric conductors against lightning-induced surges	2012	Current
Recommendation ITU-T K47	Protection of telecommunication lines against direct lightning flashes	2012	Current
Recommendation ITU-T K47	Protection of telecommunication lines using metallic conductors against direct lightning discharges	2008	Withdrawn
Recommendation ITU-T K67	Expected surges on telecommunications and signalling networks due to lightning	2006	Withdrawn
Recommendation ITU-T K67	Expected surges on telecommunications and signalling networks due to lightning	2015	Current

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