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.74 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2015) SERIES K: PROTECTION AGAINST INTERFERENCE Electromagnetic compatibility, resistibility and safety requirements for home network devices Recommendation ITU-T K.7
2、4 Rec. ITU-T K.74 (03/2015) i Recommendation ITU-T K.74 Electromagnetic compatibility, resistibility and safety requirements for home network devices Summary As a result of the widespread use of the Internet, an increasing number of networks are being installed in customer premises. Many wired and w
3、ireless telecommunication technologies have also been introduced in the home, and devices that use these technologies are now being used in close proximity to each other. This situation may cause new types of electromagnetic compatibility (EMC), resistibility and safety problems. Recommendation ITU-
4、T K.74 provides EMC requirements for home network devices, which may be comprised of many types of equipment. This Recommendation addresses the requirements for home network devices whose main function is telecommunications. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T K.
5、74 2008-09-22 5 11.1002/1000/9411 2.0 ITU-T K.74 2015-03-01 5 11.1002/1000/12408 _ * 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.
6、ITU-T K.74 (03/2015) 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
7、 responsible 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
8、 the 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 colla
9、borative 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 certa
10、in 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 requirem
11、ents. The use of such words does not suggest that compliance with 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. I
12、TU 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
13、 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 2015 All rights res
14、erved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T K.74 (03/2015) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 3 4 A
15、bbreviations and acronyms 3 5 Conventions 4 6 Configuration and problems in the home network environment 4 6.1 Basic architecture of the home network . 4 6.2 Devices in the scope of this Recommendation . 4 6.3 EMC problems 5 6.4 Electromagnetic environment in the home . 5 7 Requirements 6 7.1 Genera
16、l consideration of requirements . 6 7.2 Safety 6 7.3 EMC . 6 7.4 Resistibility . 6 7.5 Earthing and bonding . 7 7.6 Specific immunity requirements . 7 Appendix I Trouble case for IPTV broadcasting service over DSL . 8 I.1 Introduction 8 I.2 Influence of impulse noise in the home for IPTV broadcastin
17、g services . 8 Appendix II Degradation of performance of ADSL service caused by REIN 10 II.1 Introduction 10 II.2 Degradation of ADSL performance caused by REIN from a switch power supply . 10 Appendix III Network trouble in wide area Ethernet caused by impulse noise . 12 III.1 Degradation of perfor
18、mance of leased line services provided by IP networks . 12 III.2 Immunity test on the media converter 13 Bibliography. 15 iv Rec. ITU-T K.74 (03/2015) Introduction With the rapid growth of broadband and data services, many wired and wireless telecommunication technologies have been proposed, and use
19、rs can install home networks to which they can connect different kinds of equipment. This Recommendation provides a way for dealing with EMC problems that may potentially be caused by the development of home network environments, with the purpose of achieving a problem-free operation of home network
20、s. Rec. ITU-T K.74 (03/2015) 1 Recommendation ITU-T K.74 Electromagnetic compatibility, resistibility and safety requirements for home network devices 1 Scope With the recent advances in telecommunication technologies, high-speed access networks that can be readily used by users have been introduced
21、 in home environments. As a result, many users can now enjoy many network-based services, and many electronic devices can be connected to the network, allowing for the easy deployment of home networks. Additionally, many wired and wireless technologies have appeared in the market, many of which coul
22、d be introduced in home network environments. In these network configurations, several kinds of network-related equipment are introduced in the home and placed in close proximity to each other. This situation may create severe electromagnetic interferences and produce new types of electromagnetic co
23、mpatibility (EMC) problems. The purpose of this Recommendation is to provide EMC, resistibility and safety requirements for home network devices in order to avoid these EMC problems. To avoid duplication, existing international standards are referenced. This Recommendation is not intended to provide
24、 any new additional requirements for devices used in home networks, nor is it intended to replace national regulations or laws. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation
25、. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references list
26、ed 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, as a stand-alone document, the status of a Recommendation. ITU-T J.190 Recommendation ITU-T J.190 (2007), Architecture of MediaHomeNet. ITU-T
27、 K.21 Recommendation ITU-T K.21 (2011), Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents. ITU-T K.34 Recommendation ITU-T K.34 (2003), Classification of electromagnetic environmental conditions for telecommunication equipment Basic EMC Reco
28、mmendation. ITU-T K.43 Recommendation ITU-T K.43 (2009), Immunity requirements for telecommunication equipment. ITU-T K.44 Recommendation ITU-T K.44 (2012), Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents Basic Recommendation. ITU-T K.66 Recommendation IT
29、U-T K.66 (2011), Protection of customer premises from overvoltages. 2 Rec. ITU-T K.74 (03/2015) ITU-T K.85 Recommendation ITU-T K.85 (2011), Requirements for the mitigation of lightning effects on home networks installed in customer premises ITU-T K.92 Recommendation ITU-T K.92 (2012), Conducted and
30、 radiated electromagnetic environment in home networking ITU-T K.93 Recommendation ITU-T K.93 (2012), Immunity of home network devices to electromagnetic disturbances IEC 60950-1 IEC 60950-1 (2005), Information technology equipment Safety Part 1: General requirements. IEC 60950-21 IEC 60950-21 (2002
31、), Information technology equipment Safety Part 21: Remote power feeding. IEC 61000-2-5 IEC 61000-2-5 (2011), Electromagnetic compatibility (EMC) Part 2-5: Environment Description and classification of electromagnetic environments. IEC 62368-1 IEC 62368-1 ed.2 (2014), Audio/video, information and co
32、mmunication technology equipment Part 1: Safety requirements. IEC CISPR 13 IEC CISPR 13 ed.5.0 (2009), Sound and television broadcast receivers and associated equipment Radio disturbance characteristics Limits and methods of measurement. IEC CISPR 20 IEC CISPR 20 ed.6.1 (2013), Sound and television
33、broadcast receivers and associated equipment Immunity characteristics Limits and methods of measurement. IEC CISPR 22 IEC CISPR 22 ed.6.0 (2008), Information technology equipment Radio disturbance characteristics Limits and methods of measurement. IEC CISPR 24 IEC CISPR 24 ed.2.0 (2010), Information
34、 technology equipment Immunity characteristics Limits and methods of measurement. IEC CISPR 32 IEC CISPR 32 (2012), Electromagnetic Compatibility of Multimedia Equipment Emission Requirements. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following term defined elsewhere: 3.
35、1.1 MediaHomeNet ITU-T J.190: An ITU-T project that includes an architecture and a series of Recommendations that support the delivery of services over home networks. A network that connects multiple elements in a home environment to allow delivery of multi-purpose, multimedia services. Rec. ITU-T K
36、.74 (03/2015) 3 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 home network: A home network is the collection of elements that process, manage, transport and store information, thus enabling the connection and integration of multiple computing, contro
37、l, monitoring, communication and entertainment devices in the home. NOTE This definition is based on JCN-Home network. 3.2.2 home network device: A home network device is an electronic or electric equipment whose primary function is the distribution of data within the home, between the network termi
38、nation point and one or more terminal devices. 3.2.3 port: A port is a particular interface of the specified equipment with the external electromagnetic environment. It is distinguished by the function of the interface, such as a dedicated direct current (DC) power port, a telecommunication port or
39、an enclosure port. It is also classified by the physical medium, such as a symmetrical pair conductor or a coaxial conductor. 3.2.4 terminal device: A terminal device is the electronic or electric equipment that terminates home networking. The primary function of the device is not related to distrib
40、uting data within the home. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AC Alternating Current ADSL Asymmetric Digital Subscriber Line AV Audio-Visual DC Direct Current DMT Discrete Multi-Tone DSL Digital Subscriber Line DSU Digital Subscriber Unit
41、 EFT/B Electric Fast Transient/Burst EM Electromagnetic EMC Electromagnetic Compatibility EMF Electromagnetic Force ESD Electrostatic Discharge EUT Equipment Under Test GW Gateway IPTV Internet Protocol Television ITE Information Technology Equipment MPEG Moving Picture Experts Group NGN Next Genera
42、tion Network ONU Optical Network Unit PC Personal Computer PE Protective Earth 4 Rec. ITU-T K.74 (03/2015) POTS Plain Old Telephone Service PSTN Public Switched Telephone Network QoS Quality of Service REIN Repetitive Electrical Impulse Noise RF Radio Frequency RFI Radio Frequency Interface SELV Saf
43、ety Extra Low Voltage STB Set-Top Box 5 Conventions None. 6 Configuration and problems in the home network environment 6.1 Basic architecture of the home network The basic architecture of a home network is presented by the MediaHomeNet in ITU-T J.190. Figure 1 shows the basic architecture of a home
44、network in this Recommendation, which is a simplified MediaHomeNet architecture. In a home network, several kinds of equipment, such as information processing systems and communication systems are connected via networks and communication system gateways (GWs). Optical fibres or metallic cables are u
45、sed to connect to the access network. Figure 1 Basic architecture of home network 6.2 Devices in the scope of this Recommendation The term home network device is defined in clause 3.2.2. Examples of the devices under consideration in this Recommendation are as follows: 1) Telecommunication devices,
46、such as optical network units (ONUs), routers or broadband modems; Rec. ITU-T K.74 (03/2015) 5 2) Controlling devices with telecommunication ports, such as set-top boxes (STBs); 3) Information technology equipment (ITE), such as personal computers (PCs), with telecommunication ports. Terminal device
47、s, e.g., a television set that connects to a home network device or other consumer electronics device whose EMC requirements are defined in other appropriate standards, are out of the scope of this Recommendation. 6.3 EMC problems Several kinds of home network devices that are connected via wired an
48、d wireless networks co-exist in a small area where the distances between devices are very short compared to conventional distances. As a result, the influences caused by electromagnetic (EM) disturbance on sensitive equipment have become stronger than in the past, and the probability of creating int
49、erference has increased. Electronic equipment that did not have a network connection in the past have gained the capability to be connected to networks. Therefore, network configurations tend to be more and more complicated, and the issues related to EMC have to be taken into account. Unlike the telecommunications centre, the home network and its EM environment cannot be controlled by network operators, and that may cause unstable EMC conditions. Consequently, EMC prob
