ImageVerifierCode 换一换
格式:PDF , 页数:32 ,大小:331.48KB ,
资源ID:796234      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-796234.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(ITU-T G 664-2012 Optical safety procedures and requirements for optical transmission systems (Study Group 15)《(预发布)光传输系统的光学安全规程和要求》.pdf)为本站会员(fuellot230)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

ITU-T G 664-2012 Optical safety procedures and requirements for optical transmission systems (Study Group 15)《(预发布)光传输系统的光学安全规程和要求》.pdf

1、 International Telecommunication Union ITU-T G.664TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2012) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Transmission media and optical systems characteristics Characteristics of optical components and subsystems Optical safet

2、y procedures and requirements for optical transmission systems Recommendation ITU-T G.664 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRA

3、NSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADI

4、OTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 General G.600G.609 Symmetric cable pairs G.610G.619 Land coaxial cable pairs G.620G.629 Submarine cables G.630G.639 Free space optical systems G.640G.649 Optical fibre cables G.650G.659 Charact

5、eristics of optical components and subsystems G.660G.679Characteristics of optical systems G.680G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS

6、G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.664 (10/2012) i Recommendation IT

7、U-T G.664 Optical safety procedures and requirements for optical transmission systems Summary Recommendation ITU-T G.664 provides guidelines and requirements for techniques to enable optically safe working conditions (for the human eye and skin) on optical interfaces of the optical transport network

8、, in particular, for systems employing high-power Raman amplification techniques, for equipment in restricted and controlled locations. Due to revisions of relevant IEC requirements, the automatic laser shut-down (ALS) procedure, defined in a previous version of this Recommendation for synchronous d

9、igital hierarchy (SDH) systems, is no longer necessary and has therefore been moved to an informative appendix. Furthermore, this Recommendation provides new guidelines on automatic power reduction (APR) procedures for systems employing high-power Raman amplification techniques and this latest versi

10、on includes Raman-based GPON reach extension systems. History Edition Recommendation Approval Study Group 1.0 ITU-T G.664 1999-07-02 15 2.0 ITU-T G.664 2003-03-16 15 2.1 ITU-T G.664 (2003) Amd. 1 2005-01-13 15 3.0 ITU-T G.664 2006-03-29 15 4.0 ITU-T G.664 2012-02-13 15 5.0 ITU-T G.664 2012-10-29 15

11、ii Rec. ITU-T G.664 (10/2012) 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.

12、 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 Standardization Assembly (WTSA), which meets every four years, establishes the topics for

13、 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 technology which fall within ITU-Ts purview, the necessary standards are prepared o

14、n 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. Compliance with this Recommendation is voluntary. However, the Recommendation may cont

15、ain 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 obligatory language such as “must“ and the negative equivalents are used to express

16、 requirements. 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 Propert

17、y 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 of the date of approval of this Recommendation, ITU had received notice of intell

18、ectual 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/. The author thanks

19、 the International Electrotechnical Commission (IEC) for permission to reproduce information from its International Publication IEC 60825-2 ed.3.2 (2010). All such extracts are copyright of IEC, Geneva, Switzerland. All rights reserved. Further information on the IEC is available from www.iec.ch. IE

20、C has no responsibility for the placement and context in which the extracts and contents are reproduced by the author, nor is IEC in any way responsible for the other content or accuracy therein. ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, wi

21、thout the prior written permission of ITU. Rec. ITU-T G.664 (10/2012) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Terms and definitions . 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 3 4 Abbreviations and acronyms 3 5 General considerations 4 5.1 Safety consi

22、derations for avoiding damage to the human eye and skin . 4 5.2 Considerations to keep fibres damage-free 6 6 Procedures and guidelines 6 6.1 General . 6 6.2 APR procedures for systems employing discrete optical amplification . 7 6.3 APR procedures for systems based upon distributed Raman amplificat

23、ion . 9 Appendix I Examples of automatic power reduction architectures for systems (including those based upon Raman amplification) deploying an optical auxiliary channel 12 I.1 Considerations on using an OAC instead of a restart pulse for automatic restart 12 I.2 Description of APR procedure using

24、co-propagating OSC 13 I.3 Description of APR procedure using counter-propagating OSC . 14 Appendix II Description of automatic laser shutdown/automatic power shut-down (ALS/APSD) procedures for single-channel point-to-point SDH systems 16 II.1 Introduction 16 II.2 Single-channel point-to-point SDH w

25、ithout line amplifiers 17 II.3 Single-channel point-to-point SDH with line amplifiers 20 Appendix III Example(s) of APR architecture for OAN systems based upon Raman amplification . 22 III.1 Further considerations on APR procedures in Raman amplified PON reach extenders . 22 Bibliography. 23 Rec. IT

26、U-T G.664 (10/2012) 1 Recommendation ITU-T G.664 Optical safety procedures and requirements for optical transmission systems 1 Scope This Recommendation provides guidelines and requirements for techniques to enable optically safe working conditions (for the human eye and skin) on optical interfaces

27、of optical networks, for both access and transport applications, including conventional synchronous digital hierarchy (SDH) systems, for equipment in both restricted and controlled locations. The actual definition and specification of optically safe levels are considered outside the scope of this Re

28、commendation (they are provided by IEC). The main fields of application are systems designed for the optical networks, both in access and transport applications, employing Raman amplification and dense wavelength division multiplexing (DWDM) systems with large channel counts. For the purpose of ease

29、 of operating these systems, this Recommendation focuses on automatic power reduction (APR) techniques with automatic restart. As backwards compatibility with earlier Recommendations on the subject of optical safety is desired, this Recommendation provides some descriptions for safety procedures in

30、the case of single and multichannel SDH systems with and without line amplifiers. Clarification is given as to why procedures employing restart pulses for automatic laser shut-down (ALS) and automatic power shut-down (APSD), defined in a previous version of this Recommendation, are no longer appropr

31、iate or necessary for applications given in ITU-T G.691, ITU-T G.693, ITU-T G.695, ITU-T G.957 and ITU-T G.959.1. The impact of bidirectional transmission as described in ITU-T G.692 has also been considered. Some references are provided for keeping fibres damage-free when being operated at high opt

32、ical power levels. 2 References The following 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

33、 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 listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a docu

34、ment within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.662 Recommendation ITU-T G.662 (2005), Generic characteristics of optical amplifier devices and subsystems. ITU-T G.665 Recommendation ITU-T G.665 (2005), Generic characteristics of R

35、aman amplifiers and Raman amplified subsystems. ITU-T G.691 Recommendation ITU-T G.691 (2006), Optical interfaces for single channel STM-64 and other SDH systems with optical amplifiers. ITU-T G.692 Recommendation ITU-T G.692 (1998), Optical interfaces for multichannel systems with optical amplifier

36、s. ITU-T G.693 Recommendation ITU-T G.693 (2009), Optical interfaces for intra-office systems. 2 Rec. ITU-T G.664 (10/2012) ITU-T G.695 Recommendation ITU-T G.695 (2010), Optical interfaces for coarse wavelength division multiplexing applications. ITU-T G.698.1 Recommendation ITU-T G.698.1 (2009), M

37、ultichannel DWDM applications with single channel optical interfaces. ITU-T G.698.2 Recommendation ITU-T G.698.2 (2009), Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces. ITU-T G.783 Recommendation ITU-T G.783 (2006), Characteristics o

38、f synchronous digital hierarchy (SDH) equipment functional blocks. ITU-T G.798 Recommendation ITU-T G.798 (2010), Characteristics of optical transport network hierarchy equipment functional blocks. ITU-T G.872 Recommendation ITU-T G.872 (2001), Architecture of optical transport networks. ITU-T G.957

39、 Recommendation ITU-T G.957 (2006), Optical interfaces for equipments and systems relating to the synchronous digital hierarchy. ITU-T G.959.1 Recommendation ITU-T G.959.1 (2009), Optical transport network physical layer interfaces. ITU-T G.983.x Recommendation ITU-T G.983.x series, Broadband optica

40、l access systems based on Passive Optical Networks (PON). ITU-T G.984.x Recommendation ITU-T G.984.x series, Gigabit-capable passive optical networks (GPON). ITU-T G.984.6 Recommendation ITU-T G.984.6 (2008), Gigabit-capable passive optical networks (GPON): Reach extension. ITU-T G.985 Recommendatio

41、n ITU-T G.985 (2003), 100 Mbit/s point-to-point Ethernet based optical access system. ITU-T G.986 Recommendation ITU-T G.986 (2010), 1 Gbit/s point-to-point Ethernet-based optical access system. ITU-T G.987.x Recommendation ITU-T G.987.x series, 10-Gigabit-capable passive optical network (XG-PON) sy

42、stems. IEC 60825-1 IEC 60825-1 edition 2.0 (2007), Safety of laser products Part 1: Equipment classification and requirements. IEC 60825-2 IEC 60825-2 edition 3.2 (2010), Safety of laser products Part 2: Safety of optical fibre communication systems (OFCS). IEC/TR 61292-4 IEC/TR 61292-4 edition 2.0

43、(2010), Optical amplifiers Part 4: Maximum permissible optical power for the damage-free and safe use of optical amplifiers, including Raman amplifiers. 3 Terms and definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 controlled locations: IEC

44、 60825-2. 3.1.2 hazard level: IEC 60825-2. Rec. ITU-T G.664 (10/2012) 3 3.1.3 laser class: IEC 60825-1. 3.1.4 Loss of Signal (LOS): ITU-T G.783. 3.1.5 LOS overhead (LOS-O): ITU-T G.798. 3.1.6 LOS payload (LOS-P): ITU-T G.798. 3.1.7 optical multiplex section (OMS): ITU-T G.872. 3.1.8 optical supervis

45、ory channel (OSC): ITU-T G.692. 3.1.9 optical transmission section (OTS): ITU-T G.872. 3.1.10 restricted locations: IEC 60825-2. 3.1.11 unrestricted locations: IEC 60825-2. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 automatic laser shut-down (ALS)

46、: A technique (procedure) to automatically shut down the output power of laser transmitters and optical amplifiers to avoid exposure to hazardous levels. 3.2.2 automatic power reduction (APR): A technique (procedure) to automatically reduce the output power of optical amplifiers to avoid exposure to

47、 hazardous levels. 3.2.3 automatic power shut-down (APSD): A technique (procedure) to automatically shut down the output power of optical amplifiers to avoid exposure to hazardous levels; within the context of this Recommendation, the term APSD is equivalent to the term ALS. 3.2.4 loss of continuity

48、 (of an optical link): Any event which may cause hazardous optical power levels to be emitted from some point along the path of an optical transmission system. Common causes of loss of continuity of an optical link are a cable break, equipment failure, connector unplugging, etc. 3.2.5 main (optical)

49、 path: The fibre plant between the source main path interface reference point (MPI-S), S or S point of the transmitting equipment and the receive main path interface reference point (MPI-R), R or R point of the receiving equipment. 3.2.6 main path interfaces: The interfaces to the fibre plant. 3.2.7 optical auxiliary channel (OAC): An optical signal that fails in the event of loss of fibre continuity but does not require hazardous power levels to operate satis

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1