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.206 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2017) SERIES L: ENVIRONMENT AND ICTS, CLIMATE CHANGE, E-WASTE, ENERGY EFFICIENCY; CONSTRUCTION, INSTALLATION AND PROTECTION OF CABLES AND OTHER ELEMENTS OF OUTSIDE P
2、LANT Optical infrastructures Infrastructure including node elements (except cables) Requirements for passive optical nodes Outdoor optical cross-connect cabinets Recommendation ITU-T L.206 ITU-T L-SERIES RECOMMENDATIONS ENVIRONMENT AND ICTS, CLIMATE CHANGE, E-WASTE, ENERGY EFFICIENCY; CONSTRUCTION,
3、INSTALLATION AND PROTECTION 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 elements (except cables) L.20
4、0L.249 General aspects and network 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 TERRE
5、STRIAL CABLES L.430L.449 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T L.206 (08/2017) i Recommendation ITU-T L.206 Requirements for passive optical nodes Outdoor optical cross-connect cabinets Summary Recommendation ITU-T L.206 refers to outdoor optical cross-co
6、nnect cabinets deployed as passive optical nodes in outdoor environments. It deals with the cabinet housing, internal fibre management system, cable attachment and termination system, and also specifies the mechanical and environmental characteristics. History Edition Recommendation Approval Study G
7、roup Unique ID* 1.0 ITU-T L.206 2017-08-13 15 11.1002/1000/13296 Keywords Enclosures, interconnection, optical cross-connect cabinets, outside plant, passive optical nodes. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Re
8、commendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T L.206 (08/2017) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The
9、 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 Telecommunication Standar
10、dization 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 information t
11、echnology 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 agency. Comp
12、liance 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 some other o
13、bligatory 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 or implementa
14、tion 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 process. As
15、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 strongly urged
16、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.206 (08/2017) iii Table of Contents Page 1 Scope . 1 2 References . 1 3
17、Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 3 5 Conventions 3 6 Characteristics of optical cross-connect cabinets . 3 6.1 General requirements 3 6.2 Cabinet housing 4 6.3 Fibre management system (organizer system) . 5 6.4 Cabl
18、e attachment and termination system 8 7 Performance evaluation test programme 9 8 Sample preparation . 9 Annex A Performance evaluation criteria . 11 A.1 Mechanical and sealing evaluation . 11 A.2 Optical evaluation . 11 Annex B Performance test programme for ground level and above ground cabinets .
19、 13 B.1 Mechanical and sealing evaluation . 13 B.2 Optical evaluation . 15 Appendix I Sample illustrations of cabinet structure 17 Appendix II Product characterization checklist 21 Bibliography. 24 iv Rec. ITU-T L.206 (08/2017) Introduction Cabinets are widely used for protection of cross-connection
20、 points among multiple cables in outdoor environments. A cabinet along with internal functional assemblies can be referred to as an outdoor cross-connect cabinet. An optical cross-connect cabinet comprises a mechanical structure (cabinet housing) for mechanical protection and environmental sealing o
21、f internal systems, a fibre management system for guiding and managing the fibres and fibre connections inside the node, and a cable attachment and termination system for attaching and terminating the cable ends. Patch cords, splitters and other passive optical devices are optional accessories of a
22、cabinet. The optical cross-connect cabinet will: work as a cross-connection area in outdoor plant; protect the fibres, fibre joints and optical devices from the outdoor environment at ground level (normally, on a concrete base) and above ground (e.g., wall mounted or pole mounted by steel supports);
23、 provide for the organization of the fibre joints, passive devices and the storage of fibre overlength (excess fibre length); provide electrical bonding and grounding of the metal parts of the cable sheath and strength members. This Recommendation specifies the requirements of optical cross-connect
24、cabinets and the means for characterization and evaluation of the performance of cabinets according to the principles of ITU-T L.200. This includes mechanical performance, sealing performance and optical stability of the product which simulate the effect of environmental factors or interventions rel
25、ated to network maintenance and reconfiguration. It contains a basic test programme for the cabinet that is globally applicable. Additional requirements may be agreed between customer and supplier to reflect local or special conditions. All functions and features that a product may contain should be
26、 reflected in the mix of test samples that are subjected to the test programme. Rec. ITU-T L.206 (08/2017) 1 Recommendation ITU-T L.206 Requirements for passive optical nodes Outdoor optical cross-connect cabinets 1 Scope This Recommendation: refers to optical cross-connect cabinets as passive optic
27、al nodes in outdoor environments; deals with the cabinet housing as well as the fibre management system, and the cable attachment and termination system; specifies mechanical and environmental characteristics of the optical cabinets; specifies characteristics of the fibre management system; provides
28、 a test plan for the performance evaluation of outdoor optical cross-connect cabinets; supplies the simulation of the effect of interventions related to network maintenance and reconfiguration; gives a checklist for a systematic product characterization according to ITU-T L.200. 2 References The fol
29、lowing ITU-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 Rec
30、ommendation 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 no
31、t give it, as a stand-alone document, the status of a Recommendation. ITU-T G.652 Recommendation ITU-T G.652 (2016), Characteristics of a single-mode optical fibre and cable. ITU-T G.657 Recommendation ITU-T G.657 (2016), Characteristics of a bending-loss insensitive single-mode optical fibre and ca
32、ble. ITU-T K.11 Recommendation ITU-T K.11 (2009), Principles of protection against overvoltages and overcurrents. ITU-T K.47 Recommendation ITU-T K.47 (2012), Protection of telecommunication lines against direct lightning flashes. ITU-T L.200 Recommendation ITU-T L.200/L.51 (2003), Passive node elem
33、ents for fibre optic networks General principles and definitions for characterization and performance evaluation. ITU-T L.361 Recommendation ITU-T L.361/L.64 (2012), ID tag requirements for infrastructure and network elements management. IEC 60529 IEC 60529:2013, Degrees of protection provided by en
34、closures (IP Code). IEC 61300-2-1 IEC 61300-2-1:2009, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 2-1: Tests Vibration (sinusoidal). 2 Rec. ITU-T L.206 (08/2017) IEC 61300-2-4 IEC 61300-2-4:1995, Fibre optic interconnecting devices and passiv
35、e components Basic test and measurement procedures Part 2-4: Tests Fibre/cable retention. IEC 61300-2-5 IEC 61300-2-5:2009, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 2-5: Tests Torsion. IEC 61300-2-9 IEC 61300-2-9:2017, Fibre optic intercon
36、necting devices and passive components Basic test and measurement procedures Part 2-9: Tests Shock. IEC 61300-2-12 IEC 61300-2-12:2009, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 2-12: Tests Impact. IEC 61300-2-22 IEC 61300-2-22:2007, Fibre
37、optic interconnecting devices and passive components Basic test and measurement procedures Part 2-22: Tests Change of temperature. IEC 61300-2-26 IEC 61300-2-26:2006, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 2-26: Tests Salt mist. IEC 6130
38、0-2-33 IEC 61300-2-33:2012, Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-33: Tests Assembly and disassembly of fibre optic mechanical splices, fibre management systems and closures. IEC 61300-2-34 IEC 61300-2-34:2009, Fibre optic interconn
39、ecting devices and passive components Basic test and measurement procedures Part 2-34: Tests Resistance to solvents and contaminating fluids of interconnecting components and closures. IEC 61300-2-37 IEC 61300-2-37:2016, Fibre optic interconnecting devices and passive components Basic test and measu
40、rement procedures Part 2-37: Tests Cable bending for fibre optic closures. IEC 61300-3-1 IEC 61300-3-1 (2005), Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-1: Examinations and measurements Visual examination. IEC 61300-3-3 IEC 61300-3-3:2009
41、, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-3: Examinations and measurements Active monitoring of changes in attenuation and return loss. IEC 61300-3-28 IEC 61300-3-28:2012, Fibre optic interconnecting devices and passive components Basic
42、 test and measurement procedures Part 3-28: Examinations and measurements Transient loss. 3 Definitions 3.1 Terms defined elsewhere None. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: Rec. ITU-T L.206 (08/2017) 3 3.2.1 optical cross-connect cabinet: A cabi
43、net with an integrated fibre management system to protect the cross-connections of optical fibre cables. 3.2.2 cabinet housing: The outer shell of a cabinet, including lockable doors and not including the fibre management system or the cable attachment and termination system. Its main functions are
44、protection and sealing of its contents. 3.2.3 fibre management system (organizer system): The whole of the means and features that guide and store fibres and passive devices inside a node, at any location where they are not protected by the cable sheath. In a cabinet, the optical fibres are properly
45、 managed and guided from where cables enter the node until their exit. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: ID Identification IP Ingress Protection ME Multiple Element (mass storage) OA Outdoor Above ground OG Outdoor Ground level SC Single
46、Circuit SE Single Element SF Single Fibre SMC Sheet Moulding Compound SR Single Ribbon 5 Conventions None. 6 Characteristics of optical cross-connect cabinets 6.1 General requirements The general structure of optical cabinets is shown in Figure 1. 4 Rec. ITU-T L.206 (08/2017) Figure 1 General struct
47、ure of optical cabinets Each cabinet should comply with the general requirements as listed in clause 8 of ITU-T L.200. Figures I.1 to I.4 show examples of cabinets to illustrate their structures and internal fibre organization systems. 6.2 Cabinet housing The following should be considered: dimensio
48、ns should be compatible with internal contents and installation site. Generally, the maximum height of cabinet should be less than 1.6 m; the doors should be re-openable for installation, maintenance or reconfiguration. The opening angle of the door should not be less than 110o and the lock on the d
49、oor should have sufficient protection ability; the protection level of the cabinet housing should comply with the requirements of IP54 or higher degrees in IEC 60529; the cabinet housing should be made from high strength materials to provide sufficient mechanical strength, e.g., metal or sheet moulding compound (SMC; sheet form glass-fibre reinforced polyester material processed by compressio
