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ITU-T K.77 (01/2009)

Caractéristiques des varistances oxymétalliques pour la protection des installations de télécommunication

La Recommandation UIT-T K.77 donne les caractéristiques de base que les varistances oxymétalliques doivent présenter afin d'assurer la protection des circuits électriques et des circuits de signal des installations de télécommunication contre les surtensions. Cette Recommandation a pour objet de fournir des lignes directrices techniques aux acheteurs et aux fabricants de varistances oxymétalliques pour que ces dernières fonctionnent de manière satisfaisante dans les applications dans lesquelles il est prévu de les utiliser. Cette Recommandation vise à permettre d'harmoniser les spécifications existantes ou futures formulées par les fabricants de varistances oxymétalliques, les fabricants d'équipements de télécommunication, les administrations ou les opérateurs de réseau.

Citation:	https://handle.itu.int/11.1002/1000/9659
Series title:	K series: Protection against interference
Approval date:	2009-01-13
Provisional name:	K.var
Approval process:	AAP
Status:	Superseded
Maintenance responsibility:	ITU-T Study Group 5
Further details:	Patent statement(s) Development history

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
2	K.77 (07/2019)	In force	here	here	here
1.2	K.77 (2009) Amd. 1 (12/2013)	Superseded	here	-	here
1.1	K.77 (2009) Cor. 1 (05/2011)	Superseded	here	here	here
1	K.77 (01/2009)	Superseded	here	here	here


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
K Suppl. 3 (10/2015)	ITU-T K.20, K.21, K.45, K.82 – Additional criteria to protect telecommunication cabling during a power cross event	In force	here	here	here
K Suppl. 8 (11/2017)	Resistibility analysis of 5G systems	In force	here	here	here
K Suppl. 9 (05/2019)	5G technology and human exposure to radiofrequency electromagnetic fields	In force	here	here	here
K Suppl. 10 (11/2017)	Analysis of electromagnetic compatibility aspects and definition of requirements for 5G mobile systems	In force	here	here	here
K Suppl. 13 (12/2021)	Radiofrequency electromagnetic field (RF-EMF) exposure levels from mobile and portable devices during different conditions of use	In force	here	here	here
K Suppl. 14 (09/2019)	The impact of RF-EMF exposure limits stricter than the ICNIRP or IEEE guidelines on 4G and 5G mobile network deployment	In force	here	here	here
K Suppl. 16 (10/2022)	Electromagnetic field compliance assessments for 5G wireless networks	In force	here	here	here
K Suppl. 19 (09/2019)	Electromagnetic field (EMF) strength inside underground railway trains	In force	here	here	here
K Suppl. 29 (07/2022)	Electromagnetic field strength inside and outside of electric vehicles using wireless power transfer technology	In force	here	here	here
K Suppl. 32 (06/2023)	Case studies of radio frequency- electromagnetic field (RF-EMF) assessment	In force	here	here	here

Title	Approved on	Download
Mitigation measures for telecommunication installations – Chapter 10	2006	here
Mitigation measures for telecommunication installations	2004	here
Earthing and bonding	2003	here
Guide to the use of ITU-T Publications produced by Study Group 5 aimed at achieving Electromagnetic Compatibility and Safety	2002	here
Earthing of telecommunication installations	1976	here

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ITU-T Recommendations

ITU-T K.77 (01/2009)