1、 Edition 1.0 2014-04 ISO/IEC 24764 INTERNATIONAL STANDARD Information technology Generic cabling systems for data centres ISO/IEC 24764:2010-04/AMD1:2014-04(en) AMENDMENT 1 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2014 ISO/IEC, Geneva, Switzerland All rights reserved. Unless otherwise speci
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19、ec.ch. ISO/IEC 24764 Edition 1.0 2014-04 INTERNATIONAL STANDARD Information technology Generic cabling systems for data centres INTERNATIONAL ELECTROTECHNICAL COMMISSION B ICS 35.200 PRICE CODE ISBN 978-2-8891-0836-7 Warning! Make sure that you obtained this publication from an authorized distributo
20、r. AMENDMENT 1 2 ISO/IEC 24764:2010/AMD1:2014 ISO/IEC 2014 FOREWORD Amendment 1 to International Standard ISO/IEC 24764 was prepared by subcommittee 25: Interconnection of information technology equipment, of ISO/IEC joint technical committee 1: Information technology. This International Standard ha
21、s been approved by vote of the member bodies, and the voting results may be obtained from the address given on the second title page. ISO/IEC 24764:2010/AMD1:2014 3 ISO/IEC 2014Add, to the table of contents, the following new entries: CONTENTS INTRODUCTION to Amendment 1 . 4 Annex C (normative) Inte
22、rmediate distribution cabling subsystem . 7 C.1 General 7 C.2 General structure and hierarchy 7 C.2.1 General. 7 C.3 Cabling subsystems . 8 C.3.1 Main distribution cabling subsystem 8 C.3.2 Intermediate distribution cabling subsystem . 8 C.3.3 Redundancy 8 C.4 Transmission performance . 9 C.4.1 Bala
23、nced cabling . 9 C.4.2 Optical fibre cabling 10 C.5 Reference implementations 10 C.5.1 Main distribution cabling 10 C.5.2 Intermediate distribution cabling 12 Annex D (informative) Combination of balanced cabling permanent links 15 D.1 General 15 D.2 Requirements . 15 Figure C.1 Structure of generic
24、 cabling within a data centre 7 Figure C.2 Hierarchical structure of generic cabling within a data centre . 8 Figure C.3 Connection of functional elements providing redundancy . 9 Figure C.4 Main distribution cabling models 10 Figure C.5 Intermediate distribution cabling models 12 Figure D.1 Example
25、s of combined permanent links . 15 Table C.1 Length assumptions used in the mathematical modelling of balanced main distribution cabling 11 Table C.2 Main distribution channel length equations 11 Table C.3 Length assumptions used in the mathematical modelling of balanced intermediate distribution ca
26、bling 13 Table C.4 Intermediate distribution channel length equations 13 4 ISO/IEC 24764:2010/AMD1:2014 ISO/IEC 2014 Add, at the end of the existing introduction, after Figure 1, the following text: INTRODUCTION to Amendment 1 Amendment 1 of ISO/IEC 24764:2010 provides an introduction to the interme
27、diate cabling subsystem and an explanatory annex for the combination of several permanent links to form a single transmission channel. 2 Normative references Add, in the list of normative references, after reference ISO/IEC 11801, the following reference: ISO/IEC 14763-2, Information technology Impl
28、ementation and operation of customer premises cabling Part 2: Planning and installation 3.1 Terms and definitions Add, at the end of this subclause, the following new definitions: 3.1.13 equipment cord cord connecting equipment to the equipment interfaces of generic cabling 3.1.14 equipment outlet f
29、ixed connecting device for terminating the zone distribution cabling and providing the interface to the equipment cord 3.1.15 intermediate distribution cable cable connecting the intermediate distributor to the zone distributor 3.1.16 intermediate distributor distributor used to make connections bet
30、ween the main distribution cabling subsystem, intermediate distribution cabling subsystem, network access cabling subsystem and cabling subsystems specified in ISO/IEC 11801 and active equipment 3.2 Abbreviations Add, after the entry EO Equipment Outlet, the following new abbreviation: ID Intermedia
31、te Distributor ILD Insertion Loss Deviation 5 Structure of the generic cabling system 5.2 Functional elements Add, after item i), the following new NOTE: ISO/IEC 24764:2010/AMD1:2014 5 ISO/IEC 2014NOTE This standard includes additional functional elements, the intermediate distributor and the interm
32、ediate distribution cable. The requirements for these functional elements are defined in Annex C. 5.3 General structure and hierarchy Replace the entire third paragraph by the following new paragraph and NOTE: The functions of multiple distributors may be combined, see 5.7.1. NOTE This standard incl
33、udes an additional cabling subsystem: the intermediate cabling subsystem. The requirements for this additional cabling subsystem and the modifications to the cabling subsystems of this clause are defined in Annex C. Replace the existing Figure 2 by the following Figure: Network access cabling subsys
34、tem Main distribution cabling subsystem Zone distribution cabling subsystem Generic cabling system Distributor in accordance with ISO/IEC 11801 ENI LDP MD ZD EO Equipment cord EQP Network access cabling subsystem Main distribution cabling subsystem Zone distribution cabling subsystem Generic cabling
35、 system Distributor in accordance with ISO/IEC 11801 ENI LDP MD ZD EO Equipment cord EQP EQP EQP5.6 Interfaces 5.6.2 Channels and links Replace the existing second and third paragraphs by the following: The channel is the transmission path between data centre equipment such as switches and servers (
36、EQP in Figure 5). A typical channel in a data centre would consist of the zone distribution cabling subsystem together with an equipment cord at each end. For longer reach services, the channel would be formed by the connection of two or more subsystems (including patch cords and equipment cords), s
37、ee Annex D. The performance of the channel excludes the connections at the application-specific equipment. The permanent link is the transmission path of the fixed cabling subsystem, including the connecting hardware at the ends of the installed cable. In a data centre zone distribution cabling subs
38、ystem, the permanent link consists of the EO, an optional LDP cable, an optional LDP, the zone distribution cable and the termination of the zone distribution cable at the zone distributor. The permanent link includes the connections at the ends of the installed cabling. 6 Channel performance 6.1 Ge
39、neral Replace the third paragraph including bulleted list by: Channels are implemented using either: 6 ISO/IEC 24764:2010/AMD1:2014 ISO/IEC 2014 network access cabling only; main distribution cabling only; zone distribution cabling only; a combination of the above, see Annex D. Add, after Annex B, t
40、he following new Annexes C and D, and move the existing Bibliography after these new Annexes: ISO/IEC 24764:2010/AMD1:2014 7 ISO/IEC 2014Annex C (normative) Intermediate distribution cabling subsystem C.1 General Depending on the size and/or complexity of the data centres, it may require an addition
41、al subsystem in order to allow for the connection of several zone distributors. In such cases, the main distributor connects several intermediate distributors, each of which acts as local main distributors. This annex will describe the additional requirements that are required for such implementatio
42、ns. C.2 General structure and hierarchy C.2.1 General The cabling subsystems are connected together to create a generic cabling system with a structure as shown in Figure C.1. The composition of the cabling subsystems is described in 5.4.2, 5.4.3 and 5.4.4. The functional elements of the cabling sub
43、systems are connected to form a basic hierarchical topology as shown in Figure C.2. Network access cabling subsystems may be connected directly to the intermediate distributor. Cabling subsystems, as specified in ISO/IEC 11801, may also be connected directly to the intermediate distributor. Figure C
44、.1 Structure of generic cabling within a data centre Network access cabling subsystem Intermediate distribution cabling subsystem Zone distribution cabling subsystem Generic cabling system Distributor in accordance with ISO/IEC 11801 ENI LDP MD ZD EO Equipment cord EQP ID Main distribution cabling s
45、ubsystem Network access cabling subsystem Intermediate distribution cabling subsystem Zone distribution cabling subsystem Generic cabling system Distributor in accordance with ISO/IEC 11801 ENI LDP MD ZD EO Equipment cord EQP EQP EQP ID Main distribution cabling subsystem 8 ISO/IEC 24764:2010/AMD1:2
46、014 ISO/IEC 2014 Figure C.2 Hierarchical structure of generic cabling within a data centre C.3 Cabling subsystems C.3.1 Main distribution cabling subsystem The main distribution cabling subsystem extends from an MD to the ID(s) connected to it. The subsystem includes: a) the main distribution cables
47、; b) the mechanical termination of the main distribution cables at the MD together with associated patch cords and/or jumpers at the MD; c) the mechanical termination of the main distribution cables at the ID(s). C.3.2 Intermediate distribution cabling subsystem The intermediate distribution cabling
48、 subsystem extends from an ID to the ZD(s) connected to it. The subsystem includes: a) the intermediate distribution cables; b) the mechanical termination of the intermediate distribution cables at the ID together with associated patch cords and/or jumpers at the ID; c) the mechanical termination of
49、 the intermediate distribution cables at the ZD(s). C.3.3 Redundancy Consideration should be given to the resilience of the data centre with respect to the cabling infrastructure. This may be enhanced by the provision of redundant distributors, cabling, and pathways. ISO/IEC 24764:2010/AMD1:2014 9 ISO/IEC 2014In certain circumstances, for example for security or reliability reasons, redundancy may be built into a cabling design.
