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 L.1206 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2017) SERIES L: ENVIRONMENT AND ICTS, CLIMATE CHANGE, E-WASTE, ENERGY EFFICIENCY; CONSTRUCTION, INSTALLATION AND PROTECTION OF CABLES AND OTHER ELEMENTS OF OUTSIDE
2、PLANT Impact on information and communication technology equipment architecture of multiple AC, 48 VDC or up to 400 VDC power inputs Recommendation ITU-T L.1206 ITU-T L-SERIES RECOMMENDATIONS ENVIRONMENT AND ICTS, CLIMATE CHANGE, E-WASTE, ENERGY EFFICIENCY; CONSTRUCTION, INSTALLATION AND PROTECTION
3、OF CABLES AND OTHER ELEMENTS OF OUTSIDE PLANT OPTICAL FIBRE CABLES Cable structure and characteristics L.100L.124 Cable evaluation L.125L.149 Guidance and installation technique L.150L.199 OPTICAL INFRASTRUCTURES Infrastructure including node element (except cables) L.200L.249 General aspects and ne
4、twork design L.250L.299 MAINTENANCE AND OPERATION Optical fibre cable maintenance L.300L.329 Infrastructure maintenance L.330L.349 Operation support and infrastructure management L.350L.379 Disaster management L.380L.399 PASSIVE OPTICAL DEVICES L.400L.429 MARINIZED TERRESTRIAL CABLES L.430L.449 For
5、further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T L.1206 (07/2017) i Recommendation ITU-T L.1206 Impact on information and communication technology equipment architecture of multiple AC, 48 VDC or up to 400 VDC power inputs Summary Recommendation ITU-T L.1206 discusses m
6、ultiple power supply interfaces to information and communication technology (ICT) equipment operated by dual power input feeds with combinations of standardized 48 V direct current (DC) or alternating current (AC) sources, or DC source up to 400 V interfaces. Operational voltage and interface charac
7、teristics are detailed in ITU-T Recommendations and European Telecommunications Standards Institute (ETSI) relevant standards. This Recommendation also includes some details on the power architecture within the ICT equipment between the ICT power interface and the ICT end load. History Edition Recom
8、mendation Approval Study Group Unique ID* 1.0 ITU-T L.1206 2017-07-29 5 11.1002/1000/13282 Keywords Architecture, ICT, power feed, power input, power interface, up to 400 VDC, 48 VDC. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followe
9、d by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T L.1206 (07/2017) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies
10、 (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is 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 Telecommunica
11、tion Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by 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 i
12、nformation technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative 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
13、agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain 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
14、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 with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice o
15、r implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU 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
16、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 implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore str
17、ongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T L.1206 (07/2017) iii Table of Contents Page 1 Scope . 1 2 Refe
18、rences . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 Definition and requirements of multiple power interface configuration at the input of ICT equipment 3 6.1 Individual power interface used for multipl
19、e power interface configuration . 3 6.2 Multiple power interface configurations and requirements 3 7 Combination dependence of A, A3 and A3ac interfaces for multiple power feeds . 7 8 Backfeeding 10 Appendix I Power input switch selector installation options 12 I.1 External switch selector installat
20、ion and options for system interface connections . 12 I.2 Switch selector installed within converter and interface connections 13 Appendix II Power input switch selector General functionality 15 II.1 General description of the power input switch selector . 15 II.2 Input power monitoring 15 Appendix
21、III Backfeeding protection . 16 III.1 Example of backfeeding protection 16 Appendix IV Example of upstream conversion for dual 48 V power feed configuration at input of ICT equipment. 18 Bibliography. 19 iv Rec. ITU-T L.1206 (07/2017) Introduction With the advantage of the emerging up to 400 Volt DC
22、 (VDC) power distribution, along with the use of traditional alternating current (AC) and 48 VDC power distribution for networks and information and communication technology (ICT) power feeding, a new multiple power supply interface is defined as being a combination of the standardized AC or direct
23、current (DC) power system interface at the inputs of ICT systems. This Recommendation provides details showing the ICT equipment front-end power architectures that include an on-board converter and the interconnection options between the converter and the ICT interface. These include switch selectio
24、n and diode combiner solutions for multiple input feeds. With an increase in the variation of potential power feeds to ICT equipment especially with the emergence of up to 400 VDC power networks, a clear indication of how a multiple input power feed is to be referenced and how these multiple power f
25、eeds can be best managed is crucial in ensuring that common and recognized approaches are adopted in the installation and configuration of future ICT equipment. Appendix I presents options for the installation of a switch selector within ICT equipment and its operational attributes targeted for its
26、reliable operation. This Recommendation was developed jointly by the European Telecommunications Standards Institute (ETSI) and ITU-T Study Group 5, and published respectively by ITU and ETSI as Recommendation ITU-T L.1206 and ETSI Standard ETSI TS 103 531, which are technically equivalent. Rec. ITU
27、-T L.1206 (07/2017) 1 Recommendation ITU-T L.1206 Impact on information and communication technology equipment architecture of multiple AC, 48 VDC or up to 400 VDC power inputs 1 Scope This Recommendation is applicable to the case of multiple power feeding configurations at the input of information
28、and communication technology (ICT) equipment in ICT systems. It defines the requirements for the power inputs combination of the three power interfaces: A (48 V), P or A3 (up to 400 Volt DC (VDC) and A3ac (AC) that could potentially be used for each input. This Recommendation also provides details o
29、f the power structure within ICT equipment, between ICT equipment interfaces, and ICT equipment system loads that is inclusive of system power converters. The input power configurations are categorized to allow for a better understanding, identification, impacts, and benefits of adopting each power
30、feeding solution. The consequence on battery test function with the different dual power inputs combinations are indicated. Requirements are given for avoiding the potential risk of voltage backfeeding from one input to the other and for general isolation requirements. 2 References The following ITU
31、-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 Recommendatio
32、n 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,
33、 as a stand-alone document, the status of a Recommendation. ITU-T L.1200 Recommendation ITU-T L.1200 (2012), Direct current power feeding interface up to 400 V at the input to telecommunication and ICT equipment. ETSI EN 300 132-2 ETSI EN 300 132-2 V2.5.1 (2016-10), Environmental Engineering (EE); P
34、ower supply interface at the input to telecommunications and datacom (ICT) equipment; Part 2: Operated by 48 V direct current (dc). ETSI EN 300 132-3-1 ETSI EN 300 132-3-1 V2.1.1 (2012-02), Environmental Engineering (EE); Power supply interface at the input to telecommunications and datacom (ICT) eq
35、uipment; Part 3: Operated by rectified current source, alternating current source or direct current source up to 400 V; Sub-part 1: Direct current source up to 400 V. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 interface “P“ ITU-T L
36、.1200: Interface, physical point, at which power feeding system is connected to operate ICT equipment. 2 Rec. ITU-T L.1206 (07/2017) 3.1.2 hot standby state of an item b-ISO/IEC 2382-14: Standby state providing for immediate operation upon demand. NOTE 1 A hot standby state may apply to redundant or
37、 stand-alone items. NOTE 2 In some applications, an item in a hot standby state is considered to be operating. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 combined power feeding: Function by which two power inputs feeds to information and communica
38、tion technology (ICT) equipment are managed such that one input is always available to power a single power module within the ICT equipment, e.g., by using the reverse bias characteristic of a two-diode common cathode module or a dual MOSFET. 3.2.2 combiner: A device achieving the combined dependent
39、 power feed combination by diode or equivalent static electronic circuitry. 3.2.3 dependent power feed: Power feed associated with a single interface on the information and communication technology (ICT) equipment, but jointly associated to another power feed with a single power module within the IC
40、T equipment via a managed power interface (switched or combined power feed). 3.2.4 independent power feed: Power feed associated with a single interface on the information and communication technology (ICT) equipment and a single power module within the same ICT equipment used in a multiple power fe
41、eding interface. 3.2.5 interface “A“: Terminals at which the 48 VDC power supply is connected to the ICT equipment system block. NOTE This new definition is a “modified version” of the one found in ETSI EN 300 132-3-1 associated to Figure 1 and Annex A. This power interface is a functional definitio
42、n and not an exact depiction of the physical location. 3.2.6 interface “A3“: Terminals at which the up to 400 VDC power supply is connected to the ICT equipment system block. NOTE This new definition is a “modified version“ of the one found in ETSI EN 300 132-3-1 associated to Figure 1 and Annex A.
43、This power interface is a functional definition and not an exact depiction of the physical location. 3.2.7 interface “A3ac“: Interface, physical point, at which AC power supply is connected in order to operate the ICT equipment. NOTE This new definition is a “modified version“ of the one found in ET
44、SI EN 300 132-3-1 associated to Chapter 4, Figure 1 and Annex B. This power interface is a functional definition and not an exact depiction of the physical location. 3.2.8 switched power feeding: Method by which two power inputs feeds to information and communication technology (ICT) equipment are m
45、anaged such that one input is always available to power a single power module within the ICT equipment with the use of a switch. 3.2.9 switch selector: A device achieving the switched dependent power feed selection by a power switch. 4 Abbreviations and acronyms This Recommendation uses the followin
46、g abbreviations and acronyms: AC Alternating Current A+ Pole plus of input A A Pole minus of input A Rec. ITU-T L.1206 (07/2017) 3 B+ Pole plus of input B B Pole minus of input BCONV Converter D Diode DC Direct Current ICT Information and Communication Technology MOSFET Metal-Oxide-Semiconductor Fie
47、ld-Effect Transistor SwSelect Switch Selector VAC Volt AC VDC Volt DC 5 Conventions None. 6 Definition and requirements of multiple power interface configuration at the input of ICT equipment 6.1 Individual power interface used for multiple power interface configuration The power supply interfaces p
48、resented in Figures 1 to 6, are the physical inter-connection points to which all the requirements are related. This point is situated between the power supply system(s) and ICT equipment. Definitions of configurations in which “A“, “P(A3)“ and “A3ac“ interfaces presented as individual interface ref
49、erences are shown in the following documents: b-ETSI EN 300 132-1 Annex C (AC supply) A3ac interface; ETSI EN 300 132-2 Annex E (48 VDC supply) A interface; ITU-T L.1200 P interface (up to 400 VDC supply) equivalent to ETSI EN 300 132-3-1 Annex B A3 interface. NOTE Subject to the installation preconditions, this point may be located at any other point between the power supply system and ICT equipment by mutual agreement of the relevant parties. 6.2 Multiple power interface configuration
