1、 International Telecommunication Union ITU-T K.58TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2014) SERIES K: PROTECTION AGAINST INTERFERENCE EMC, resistibility and safety requirements and guidance for determining responsibility under co-located information and communication technology instal
2、lations Recommendation ITU-T K.58 Rec. ITU-T K.58 (02/2014) i Recommendation ITU-T K.58 EMC, resistibility and safety requirements and guidance for determining responsibility under co-located information and communication technology installations Summary With the liberalization of telecommunications
3、 and the convergence of information technology (IT) and communication equipment, many services are provided by several operators on the same cable and within the same location. Equipment owned by different operators is installed in the same telecommunication facilities and information and communicat
4、ion technology (ICT) installations and, in many cases, is interconnected. Therefore, problems related to electromagnetic compatibility (EMC), resistibility and safety can occur. Recommendation ITU-T K.58 describes the necessary steps to ensure safe and problem-free operation in co-located ICT instal
5、lations from EMC, resistibility and safety points of view. This Recommendation also gives guidance for determining responsibility of EMC problems in co-located ICT installations. History Edition Recommendation Approval Study Group Unique ID*1.0 ITU-T K.58 2003-07-29 5 11.1002/1000/6502 2.0 ITU-T K.5
6、8 2008-04-13 5 11.1002/1000/9407 3.0 ITU-T K.58 2014-02-13 5 11.1002/1000/12124 _ *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. IT
7、U-T K.58 (02/2014) FOREWORD The International Telecommunication 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 r
8、esponsible for studying technical, operating and tariff questions 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 t
9、he ITU-T study groups which, in turn, produce Recommendations 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 collabo
10、rative basis with ISO and IEC. NOTE In this Recommendation, the 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
11、 mandatory provisions (to ensure, e.g., interoperability or applicability) 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 requiremen
12、ts. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. IT
13、U takes no position concerning the evidence, validity or applicability 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
14、property, protected by patents, which may be required to implement 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 2014 All rights rese
15、rved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T K.58 (02/2014) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 3 3.1 Terms defined elsewhere 3 3.2 Terms defined in this Recommendation . 3 4 Abbre
16、viations and acronyms 3 5 Configuration and problems in a co-located ICT installations . 4 6 Issues to be considered . 4 7 Guiding principle 5 8 Typical EM environment in co-location . 5 9 Requirements 5 9.1 General conditions 6 9.2 Safety 6 9.3 EMC requirements 6 9.4 Resistibility . 6 9.5 Earthing
17、and bonding . 7 9.6 Interface and port condition 7 10 Procedure for countermeasures. 8 10.1 Safety 8 10.2 EMC . 8 10.3 Resistibility . 9 10.4 Aspects to be considered 9 11 Guidance for distinguishing responsibility . 9 11.1 Determining the cause of the problem 9 11.2 Responsibility . 10 Appendix I E
18、xample of EMI problem in co-located environment . 15 I.1 Introduction 15 I.2 Example of the procedure for how to solve an EMI problem in co-located environment 15 Bibliography. 20 Rec. ITU-T K.58 (02/2014) 1 Recommendation ITU-T K.58 EMC, resistibility and safety requirements and guidance for determ
19、ining responsibility under co-located information and communication technology installations 1 Scope The purpose of this Recommendation is to provide guidance aimed at ensuring safe and problem-free operation in co-located information and communication technology (ICT) installations from the viewpoi
20、nt of electromagnetic compatibility (EMC), resistibility and safety. This Recommendation deals with the following environments where equipment owned by several operators can be installed: telecommunication centres; data centres; remote electronic sites; in some instances, the customer premises when
21、the equipment owned by operators is installed in that environment. Minimum requirements are given in this Recommendation in order to ensure safe and problem-free operation and to reduce EMC, resistibility and safety problems. The main aspects are: safety for humans and equipment; electromagnetic emi
22、ssion and immunity; resistibility against overvoltage and overcurrent; and earthing. The procedures and countermeasures that are used in case of problems are also described in this Recommendation. Also, this Recommendation provides guidance on determining responsibility when an EMC problem occurs. I
23、f national regulations or agreements for co-location between operators exists, then this Recommendation supports the items that these documents do not cover. Requirements that are not related to EMC, resistibility and safety are outside the scope of this Recommendation. 2 References The following IT
24、U-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendati
25、on are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it
26、, as a stand-alone document, the status of a Recommendation. ITU-T K.11 Recommendation ITU-T K.11 (2009), Principles of protection against overvoltages and overcurrents. ITU-T K.12 Recommendation ITU-T K.12 (2010), Characteristics of gas discharge tubes for the protection of telecommunications insta
27、llations. ITU-T K.20 Recommendation ITU-T K.20 (2011), Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents. ITU-T K.21 Recommendation ITU-T K.21 (2011), Resistibility of telecommunication equipment installed in customer premises to o
28、vervoltages and overcurrents. 2 Rec. ITU-T K.58 (02/2014) ITU-T K.27 Recommendation ITU-T K.27 (1996), Bonding configurations and earthing inside a telecommunication building. ITU-T K.28 Recommendation ITU-T K.28 (2012), Parameters of thyristor-based surge protective devices for the protection of te
29、lecommunication installations. ITU-T K.34 Recommendation ITU-T K.34 (2003), Classification of electromagnetic environmental conditions for telecommunication equipment Basic EMC Recommendation. ITU-T K.35 Recommendation ITU-T K.35 (1996), Bonding configurations and earthing at remote electronic sites
30、. ITU-T K.37 Recommendation ITU-T K.37 (1999), Low and high frequency EMC mitigation techniques for telecommunication installations and systems Basic EMC Recommendation. ITU-T K.43 Recommendation ITU-T K.43 (2009), Immunity requirements for telecommunication equipment. ITU-T K.44 Recommendation ITU-
31、T K.44 (2012), Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents Basic Recommendation. ITU-T K.45 Recommendation ITU-T K.45 (2011), Resistibility of telecommunication equipment installed in the access and trunk networks to overvoltages and overcurrents. ITU
32、-T K.48 Recommendation ITU-T K.48 (2006), EMC requirements for telecommunication equipment Product family Recommendation. ITU-T K.50 Recommendation ITU-T K.50 (2000), Safe limits of operating voltages and currents for telecommunication systems powered over the network. ITU-T K.54 Recommendation ITU-
33、T K.54 (2004), Conducted immunity test method and level at fundamental power frequencies. ITU-T K.63 Recommendation ITU-T K.63 (2004), Maintaining the suitability of production telecommunications equipment to its intended electromagnetic environment. ITU-T K.66 Recommendation ITU-T K.66 (2011), Prot
34、ection of customer premises from overvoltages. ITU-T K.76 Recommendation ITU-T K.76 (2008), EMC requirements for telecommunication network equipment (9 kHz-150 kHz). ITU-T K.80 Recommendation ITU-T K.80 (2009), EMC requirements for telecommunication network equipment (1 GHz-6 GHz). ITU-T K.88 Recomm
35、endation ITU-T K.88 (2011), EMC requirements for next generation network equipment. IEC 60950-1 IEC 60950-1 ed2.0 (2005), Information technology equipment Safety Part 1: General requirements. IEC 60950-21 IEC 60950-21 ed1.0 (2002), Information technology equipment Safety Part 21: Remote power feedin
36、g. IEC 62305-2 IEC 62305-2 (2006), Protection against lightning Part 2: Risk management. Rec. ITU-T K.58 (02/2014) 3 3 Definitions 3.1 Terms defined elsewhere None. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 information and communication technolog
37、y (ICT): Technologies and equipment that handle (e.g., access, create, collect, store, transmit, receive, disseminate) information and communication. 3.2.2 co-located ICT installations: Installations containing telecommunications and ICT equipment from more than one operator, being located within di
38、stinct and separate sections of the equipment room and sharing common infrastructure (i.e., earthing and bonding arrangement, power supply, etc.). 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AC Alternating Current ADSL Asymmetric Digital Subscriber
39、 Line DC Direct Current DSL Digital Subscriber Line DSLAM Digital Subscriber Line Access Multiplexer EM Electromagnetic EMC Electromagnetic Compatibility EMI Electromagnetic Interference ESD Electrostatic Discharge ICT Information and Communication Technology IEC International Electrotechnical Commi
40、ssion IT Information Technology LPS Lightning Protection System MDF Main Distribution Frame POTS Plain Old Telephone Service POI Point Of Interference SE Source Equipment SEO Source Equipment Owner SPD Surge Protective Device VE Victim Equipment VEO Victim Equipment Owner 4 Rec. ITU-T K.58 (02/2014)
41、 5 Configuration and problems in a co-located ICT installations An example of a co-located ICT installation is illustrated in Figure 1. In a telecommunication centre or data centre, telecommunication and ICT equipment owned by different operators could be installed in the same floor or room, and may
42、 connect to each other. Moreover, in some cases, telecommunication and ICT devices owned by different operators could be installed in the same customer premises because users may simultaneously use several kinds of telecommunication services provided by each of them. In some cases, equipment belongi
43、ng to several operators may be installed close to each other. Furthermore, the different operators may share common installation infrastructure, such as the earthing system, the alternating current (AC) power supply, the direct current (DC) power supply and the main distribution frame (MDF) connecte
44、d with a primary protector. One operator may maintain the whole telecommunication and ICT installations, or each operator may maintain its own, separate infrastructure. The reliability and safety of equipment may be ensured by unifying equipment specifications or testing equipment installed in a tel
45、ecommunication facility when the equipment is owned by one operator. However, in a co-location environment, reliability and safety are sometimes difficult to ensure because different operators may employ different equipment specifications and/or working practices. Therefore, minimum common requireme
46、nts for equipment or systems related to EMC, resistibility and safety should be established to avoid malfunction or damage arising from electromagnetic interference, and to ensure the safety of service personnel and customers. Moreover, ensuring problem-free operation requires the definition of eart
47、hing and bonding methods, working procedures and protection measures. Figure 1 An example of a co-located telecommunications installation 6 Issues to be considered 1) Electromagnetic interference Interference by both radiated and conducted emissions should be taken into account because ICT equipment
48、 may be installed close to radio equipment and its power-feeding Rec. ITU-T K.58 (02/2014) 5 cable and telecommunication cable are interconnected between equipment owned by different operators. 2) Quality and stability of the power supply fluctuations in operating voltage can occur when another piec
49、e of equipment connected to the same power supply is switched on. Unintentional oscillations in the power feeding system can occur for specific conditions of output impedance of the power system, load impedance and inductance of the power line cable. If this happens, in the worst case, equipment connected to the system would shut down or break down. 3) Lightning In the case of a direct lightning strike to a telecommunication building, lightning current flows from the radio towe
