1、 International Telecommunication Union ITU-T G.959.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2012) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Digital line systems Optical transport network physical layer interfaces Recom
2、mendation ITU-T G.959.1 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-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNA
3、TIONAL 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 RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OP
4、TICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 General G.900G.909 Parameters for optical fibre cable systems G.910G.919 Digital sections at hierarchical bit rates based on a bit rate of 2
5、048 kbit/s G.920G.929 Digital line transmission systems on cable at non-hierarchical bit rates G.930G.939 Digital line systems provided by FDM transmission bearers G.940G.949 Digital line systems G.950G.959Digital section and digital transmission systems for customer access to ISDN G.960G.969 Optica
6、l fibre submarine cable systems G.970G.979 Optical line systems for local and access networks G.980G.989 Access networks G.990G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC
7、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.959.1 (02/2012) i Recommendation ITU-T G.959.1 Optical transport network physical layer interfaces Summary Recommendation
8、ITU-T G.959.1 provides physical layer inter-domain interface (IrDI) specifications for optical networks which may employ wavelength division multiplexing (WDM). The IrDIs within the optical transport network (OTN) are provided by unidirectional, point-to-point, single and multichannel line systems.
9、Their primary purpose is to enable transversely-compatible interfaces to span the boundary between two administrative domains. The IrDI specifications include intra-office, short-haul and long-haul applications, without line amplifiers. This version of this Recommendation includes single channel int
10、erfaces up to OTU3 (40 Gbit/s) rate and multichannel interfaces suitable for OTL4.4 (OTU4 striped across four physical lanes). History Edition Recommendation Approval Study Group 1.0 ITU-T G.959.1 2001-02-09 15 2.0 ITU-T G.959.1 2003-12-14 15 3.0 ITU-T G.959.1 2006-03-29 15 4.0 ITU-T G.959.1 2008-03
11、-29 15 5.0 ITU-T G.959.1 2009-11-13 15 5.1 ITU-T G.959.1 (2009) Amd. 1 2011-04-13 15 6.0 ITU-T G.959.1 2012-02-13 15 ii Rec. ITU-T G.959.1 (02/2012) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and c
12、ommunication technologies (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
13、. The World Telecommunication 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 Resolut
14、ion 1. In some areas of information 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 an
15、d a recognized operating 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 m
16、et. The words “shall“ or 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 RIGHTS ITU draws attention to the possi
17、bility that the practice or 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 R
18、ecommendation development process. As of the date of approval of this Recommendation, ITU had 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
19、 and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2012 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 G.959.1 (02/2012) iii Table of Contents
20、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 Classification of optical interfaces 5 5.1 Applications 5 5.2 Reference points . 6 5.3 Nomenclature . 7 5.4 Multichannel inter-domain
21、 interfaces . 9 5.5 Single-channel inter-domain interfaces 11 5.6 Management signal implementations . 15 6 Transverse compatibility 16 7 Parameter definitions 16 7.1 System operating wavelength range . 16 7.2 Parameters 16 8 Parameter values . 29 8.1 Multichannel IrDI . 29 8.2 Single channel IrDI .
22、36 9 Optical safety considerations 51 10 Power level management 51 Annex A Configuration for method A for assessment of single-channel characteristics in a multichannel IrDI . 52 A.1 Reference configuration . 52 Annex B Reference optical bandpass filter and reference receiver characteristics for met
23、hod B, for assessment of single-channel characteristics in a multichannel IrDI 53 B.1 Reference configuration . 53 B.2 Reference optical bandpass filter 53 B.3 Reference receiver 54 Appendix I Single-channel client interfaces with 3R regeneration 55 I.1 Introduction 55 I.2 Description of client sign
24、al interfaces with 3R regeneration . 55 Appendix II Generic reference points within the OTN . 56 Appendix III Clarification of use of reference points within IrDI and IaDI . 58 iv Rec. ITU-T G.959.1 (02/2012) Page Appendix IV Considerations for management signal implementations . 59 IV.1 Optical cha
25、nnel management signal implementation . 59 IV.2 Optical multiplex section and optical transmission section management signal implementation 59 Appendix V Nomenclature for the highest class of optical tributary signal supported 60 Appendix VI Optical tributary signal class RZ 40G applications 61 Appe
26、ndix VII Applications using electronic dispersion compensation 63 Bibliography. 65 Rec. ITU-T G.959.1 (02/2012) 1 Recommendation ITU-T G.959.1 Optical transport network physical layer interfaces 1 Scope This Recommendation provides physical layer inter-domain interface (IrDI) specifications for opti
27、cal networks which may employ wavelength division multiplexing (WDM). These interfaces may also be employed, where appropriate, as intra-domain interfaces (IaDI). The physical layer specifications are valid for non-OTN IrDIs, while also allowing application on OTN IrDIs according to ITU-T G.709. In
28、the case of a non-OTN IrDI, OTN management capabilities are not required. The IrDIs within the optical transport network (OTN) are provided by unidirectional, point-to-point, single and multichannel line systems. Their primary purpose is to enable transversely compatible interfaces to span the bound
29、ary between two administrative domains. The IrDI specifications include intra-office, short-haul and long-haul applications, without line amplifiers. NOTE For the purposes of this Recommendation, the term “administrative domain“ is understood to mean the extent of resources which belong to a single
30、player such as a network operator, a service provider or an end-user. Administrative domains of different players do not overlap among themselves. The specifications are organized according to application codes, which take into account the many possible combinations of channel counts, optical tribut
31、ary signal types, span distances, fibre types and system configurations. The reference configuration and application codes form the foundation for specifying the optical networking physical layer parameters. In this Recommendation, the use of an optical supervisory channel has not been considered (e
32、xcept for the discussion in Appendix IV). Future versions and other new ITU-T Recommendations will further address this aspect of the OTN, possibly involving an arrangement of optical network elements on either side of an optical subnetwork interface that is more complex than point-to-point. For the
33、se applications, different parameters beyond those specified for a point-to-point configuration may be required. This Recommendation presumes that the optical tributary signals transported within optical channels are digital rather than analogue. Specifications for systems enabling transport of anal
34、ogue optical tributary signals are for further study. 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 Recom
35、mendations 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 listed below. A list of the currently valid ITU-T Recommendations is regularly
36、 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 G.652 Recommendation ITU-T G.652 (2005), Characteristics of a single-mode optical fibre and cable. ITU-T G.653 Recommendation ITU-T G.653 (2006), Char
37、acteristics of a dispersion-shifted single-mode optical fibre and cable. ITU-T G.655 Recommendation ITU-T G.655 (2006), Characteristics of a non-zero dispersion-shifted single-mode optical fibre and cable. ITU-T G.664 Recommendation ITU-T G.664 (2006), Optical safety procedures and requirements for
38、optical transport systems. 2 Rec. ITU-T G.959.1 (02/2012) 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
39、 amplifiers. ITU-T G.693 Recommendation ITU-T G.693 (2005), Optical interfaces for intra-office systems. ITU-T G.694.1 Recommendation ITU-T G.694.1 (2002), Spectral grids for WDM applications: DWDM frequency grid. ITU-T G.707 Recommendation ITU-T G.707/Y.1322 (2003), Network node interface for the s
40、ynchronous digital hierarchy (SDH). ITU-T G.709 Recommendation ITU-T G.709/Y.1331 (2003), Interfaces for the Optical Transport Network (OTN). ITU-T G.872 Recommendation ITU-T G.872 (2001), Architecture of optical transport networks. ITU-T G.957 Recommendation ITU-T G.957 (2006), Optical interfaces f
41、or equipments and systems relating to the synchronous digital hierarchy. ITU-T G.8251 Recommendation ITU-T G.8251 (2001), The control of jitter and wander within the optical transport network (OTN). IEC 60825-1 IEC 60825-1 (2001), Safety of laser products Part 1: Equipment classification and require
42、ments. IEC 60825-2 IEC 60825-2 (2005), Safety of laser products Part 2: Safety of optical fibre communication systems (OFCS). 3 Terms and definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 3R regeneration: ITU-T G.872. 3.1.2 completely stand
43、ardized OTUk (OTUk): ITU-T G.709. 3.1.3 inter-domain interface (IrDI): ITU-T G.872. 3.1.4 intra-domain interface (IaDI): ITU-T G.872. 3.1.5 optical channel (OCh): ITU-T G.872. 3.1.6 optical multiplex section (OMS): ITU-T G.872. 3.1.7 optical supervisory channel (OSC): ITU-T G.692. 3.1.8 optical tran
44、smission section (OTS): ITU-T G.872. Rec. ITU-T G.959.1 (02/2012) 3 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 non-OTN: This term refers to systems not compliant with the suite of OTN Recommendations indicated in b-ITU-T G.871. In particular, non-
45、OTN systems may rely on client-specific overhead information for performance monitoring, management and protection switching/restoration of the single-channel client signals. 3.2.2 optical transmission section of order 1 (OTS1): A single channel signal that provides transport of an optical channel b
46、etween two optical network elements. 3.2.3 optical transmission section of order n (OTSn): A multichannel signal that provides transport of an optical multiplex section, which in turn provides transport of up to n (n 1) optical channels between two optical network elements. 3.2.4 optical tributary s
47、ignal: A single channel signal that is placed within an optical channel for transport across the optical network. 3.2.5 optical tributary signal class NRZ 1.25G: Applies to continuous digital signals with non-return to zero line coding, from nominally 622 Mbit/s to nominally 1.25 Gbit/s. Optical tri
48、butary signal class NRZ 1.25G includes a signal with STM-4 bit rate according to ITU-T G.707. 3.2.6 optical tributary signal class NRZ 2.5G: Applies to continuous digital signals with non-return to zero line coding, from nominally 622 Mbit/s to nominally 2.67 Gbit/s. Optical tributary signal class N
49、RZ 2.5G includes a signal with STM-16 bit rate according to ITU-T G.707 and OTU1 bit rate according to ITU-T G.709. 3.2.7 optical tributary signal class NRZ 10G: Applies to continuous digital signals with non-return to zero line coding, from nominally 2.4 Gbit/s to nominally 10.76 Gbit/s. Optical tributary signal class NRZ 10G includes a signal with STM-64 bit rate according to ITU-T G.707, OTU2 bit rate according to ITU-T G.709 and OTL3.4 bit rate (OTU3 stri
