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ITU-T K.21 (08/2022)

قابلية مقاومة تجهيزات الاتصالات المركبة في أماكن الزبون لأحوال فرط الفلطية وفرط التيار

تحدد التوصية ITU-T K.21 متطلبات قابلية المقاومة وإجراءات الاختبار لتجهيزات الاتصالات المركّبة في مقر العميل أو الملحقة به. وتشمل حالات فرط الفلطية وفرط التيار التي تغطيها التوصية ITU-T K.21 حالات الجموح الناجمة عن الصواعق عند موقع الخط أو بالقرب منه، والتحريض القصير الأمد من خطوط كهرباء التيار المتناوب (a.c.) أو أنظمة السكك الحديدية المجاورة، وارتفاع كمون الأرض الناجم عن أعطال الكهرباء، والتَماس المباشر بين خطوط الاتصالات وخطوط الكهرباء وتفريغات الكهرباء الساكنة (ESD). ومصادر أحوال فرط الفلطية في الخطوط الداخلية هي بالدرجة الرئيسية اقتران تحريضي ناجم عن تيارات صواعق تمر في نزلات صواعق قريبة أو تيارات صواعق تمر في موصلات قريبة.

Citation:	https://handle.itu.int/11.1002/1000/15036
Series title:	K series: Protection against interference
Approval date:	2022-08-13
Provisional name:	K.y
Approval process:	AAP
Status:	In force
Maintenance responsibility:	ITU-T Study Group 5
Further details:	Patent statement(s) Development history [8 related work items in progress]

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
13	K.21 (08/2022)	In force	here	here	here
12.1	K.21 (2019) Amd. 1 (06/2020)	Superseded	here	here	here
12	K.21 (07/2019)	Superseded	here	here	here
11	K.21 (10/2018)	Superseded	here	here	here
10	K.21 (07/2017)	Superseded	here	here	here
9	K.21 (12/2016)	Superseded	here	here	here
8	K.21 (06/2016)	Superseded	here	here	here
7	K.21 (04/2015)	Superseded	here	here	here
6	K.21 (11/2011)	Superseded	here	here	here
6.0	K.21 (2011) Err. 1 (05/2014)	Superseded	-	-	here
5	K.21 (04/2008)	Superseded	here	here	here
5.0	K.21 (2008) Err. 1 (05/2008)	Superseded	-	-	here
4	K.21 (07/2003)	Superseded	here	here	here
4.0	K.21 (2003) Err. 1 (01/2004)	Superseded	-	-	here
3	K.21 (10/2000)	Superseded	here	here	here
2	K.21 (10/1996)	Superseded	here	here	here
1	K.21 (11/1988)	Superseded	-	here	here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. 15 (09/2018)	ITU-T K.20, K.21 and K.44 – Internal DC powering interface surge testing factors	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. 21 (05/2021)	ITU-T K.21 – Rationale for setting resistibility requirements of telecommunication equipment installed in customer premises against lightning	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
Guide on the use of the overvoltage resistibility for Recommendations ITU-T K.20, K.21 and K.45	2023-11-22	here
Guide on the use of the overvoltage resistibility for Recommendations ITU-T K.20, K.21 and K.45	2012-04-19	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 K.21 (08/2022)