1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T K.44 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2 (12/2015) SERIES K: PROTECTION AGAINST INTERFERENCE Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents Basic Recomme
2、ndation Amendment 2 Recommendation ITU-T K.44 (2012) Amendment 2 Rec. ITU-T K.44 (2012)/Amd.2 (12/2015) i Recommendation ITU-T K.44 Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents Basic Recommendation Amendment 2 Summary Amendment 2 to Recommendation ITU-
3、T K.44 (2012) introduces changes to the following clauses: 3.1 Definitions 3.2 Abbreviations and acronyms A.3 Test generators History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T K.44 2000-02-25 5 11.1002/1000/4907 2.0 ITU-T K.44 2003-07-29 5 11.1002/1000/6496 3.0 ITU-T K.44 2008
4、-04-13 5 11.1002/1000/9403 4.0 ITU-T K.44 2011-11-13 5 11.1002/1000/11422 5.0 ITU-T K.44 2012-05-29 5 11.1002/1000/11629 5.1 ITU-T K.44 (2012) Cor. 1 2013-03-16 5 11.1002/1000/11902 5.2 ITU-T K.44 (2012) Amd. 1 2015-04-22 5 11.1002/1000/12406 5.3 ITU-T K.44 (2012) Amd. 2 2015-12-14 5 11.1002/1000/12
5、679 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T K.44 (2012)/Amd.2 (12/2015) FOREWORD The International Telecommunicatio
6、n Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questi
7、ons and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations
8、on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, th
9、e expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or ap
10、plicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance wit
11、h the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applic
12、ability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implem
13、ent this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2016 All rights reserved. No part of this publication may be reproduced, by any mea
14、ns whatsoever, without the prior written permission of ITU. Rec. ITU-T K.44 (2012)/Amd.2 (12/2015) iii Table of Contents Page 1) Clause 3.1 Definitions 1 2) Clause 3.2 Abbreviations and acronyms 1 3) Figure A.3-1 in clause A.3 Test generators 1 4) Figure A.3-5 in clause A.3 Test generators 2 Rec. IT
15、U-T K.44 (2012)/Amd.2 (12/2015) 1 Recommendation ITU-T K.44 Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents Basic Recommendation Amendment 2 1) Clause 3.1 Definitions Replace: 3.1.23 remote power feed: A remote power feed is a power feed provided by symme
16、tric signal pairs or inner conductors of coaxial circuits simultaneously used for signal transmission. An example of a remote power feed is a remote feed telecommunication (RFT). Remote power feeds complying with the requirements for a TNV circuit are not classified as a remote power feed. The requi
17、rements for a TNV circuit are provided in b-IEC 60950-1, a dedicated power feed (dpf) is defined in clause 3.1.7, and an RFT is defined in b-ITU-T K.50. With: 3.1.23 remote power feed: A remote power feed is a power feed provided by symmetric signal pairs or inner conductors of coaxial circuits simu
18、ltaneously used for signal transmission. Remote power feeds complying with the requirements for a TNV circuit are not classified as a remote power feed. The requirements for a TNV circuit are provided in b-IEC 60950-1 and a dedicated power feed (dpf) is defined in clause 3.1.7. 2) Clause 3.2 Abbrevi
19、ations and acronyms Remove the entry for RFT: RFT Remote Feed Telecommunication 3) Figure A.3-1 in clause A.3, Test generators Replace Figure A.3-1 with the figure below: NOTE 1 The 10/700 open-circuit voltage waveshape shall have a front time of 10 s 3 s and a time to half value from virtual zero o
20、f 700 s 144 s. NOTE 2 The 5/320 short-circuit current waveshape in a single output of R = 25 connected to the generator return shall have a front time of 5 s 1.0 s and a time to half value from virtual zero of 320 s 64 s. NOTE 3 In Figure A.3-1 all resistors shall have a 5 % tolerance and all capaci
21、tors a 10 % tolerance. Figure A.3-1 10/700 s voltage surge generator 2 Rec. ITU-T K.44 (2012)/Amd.2 (12/2015) 4) Figure A.3-5 in clause A.3, Test generators Replace Figure A.3-5 with the figure below: NOTE 1 The 1.2/50 open-circuit voltage waveshape shall be according to IEC 60060-1 having a front t
22、ime of 1.2 s 30% and a time to half value from virtual zero of 50 s 20%. NOTE 2 The 8/20 short-circuit current waveshape shall be according to IEC 62475 having a front time of 8 s 20% and a time to half value from virtual zero of 20 s 20%. The opposite polarity current undershoot shall not exceed 30
23、% of the peak current. NOTE 3 The ratio of peak open-circuit voltage to short-circuit current Ri shall be 2 10%. Figure A.3-5 Combination wave generator Printed in Switzerland Geneva, 2016 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles S
24、eries E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network S
25、eries J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of outside pl
26、ant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Terminals and subjective and objective assessment methods Series Q Switchi
27、ng and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects, next-generation networks, Internet of Things and smart cities Series Z Languages and general software aspects for telecommunication systems
