ITU-T G 798-2017 Characteristics of optical transport network hierarchy equipment functional blocks (Study Group 15).pdf

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 G.798 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2017) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Other terminal equipment Characteristics of optical transpor

2、t network hierarchy equipment functional blocks Recommendation ITU-T G.798 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 SYSTE

3、MS 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 RADIOTELEPHONY AND

4、LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 General G.700G.709 Coding of voice and audio signals G.710G.729 Principal characteristics of primary multiplex equipment G.730G.739 Principal characteristics of second o

5、rder multiplex equipment G.740G.749 Principal characteristics of higher order multiplex equipment G.750G.759 Principal characteristics of transcoder and digital multiplication equipment G.760G.769 Operations, administration and maintenance features of transmission equipment G.770G.779 Principal char

6、acteristics of multiplexing equipment for the synchronous digital hierarchy G.780G.789 Other terminal equipment G.790G.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 G.1000G.1999 TRANS

7、MISSION 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.798 (12/2017) i Recommendation ITU-T G.798 Characte

8、ristics of optical transport network hierarchy equipment functional blocks Summary Recommendation ITU-T G.798 specifies both the components and the methodology that should be used in order to specify the optical transport network (OTN) functionality of network elements; it does not specify individua

9、l optical transport network equipment. Edition 6.0 of this Recommendation includes the text of Amendments 1, 2 and 3, as well as Corrigendum 1 to Edition 5.0 of this Recommendation, addition of Beyond 100 Gbit/s OTU and ODU functions and optical layer terminology updates. Edition 6.0 furthermore del

10、eted the ODU virtual concatenation functions and the ODUkP to ATM adaptation function and removed the processing of the TCM ACT and FTFL overhead bytes. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.798 2002-01-06 15 11.1002/1000/5604 1.1 ITU-T G.798 (2002) Amd. 1 2002-0

11、6-13 15 11.1002/1000/6057 2.0 ITU-T G.798 2004-06-13 15 11.1002/1000/7329 3.0 ITU-T G.798 2006-12-14 15 11.1002/1000/8983 3.1 ITU-T G.798 (2006) Amd. 1 2008-12-12 15 11.1002/1000/9669 3.2 ITU-T G.798 (2006) Cor.1 2009-01-13 15 11.1002/1000/9647 4.0 ITU-T G.798 2010-10-22 15 11.1002/1000/10877 4.1 IT

12、U-T G.798 (2010) Cor. 1 2011-04-13 15 11.1002/1000/11117 4.2 ITU-T G.798 (2010) Amd. 1 2011-07-22 15 11.1002/1000/11116 4.3 ITU-T G.798 (2010) Cor. 2 2012-02-13 15 11.1002/1000/11488 4.4 ITU-T G.798 (2010) Amd. 2 2012-04-06 15 11.1002/1000/11487 5.0 ITU-T G.798 2012-12-22 15 11.1002/1000/11778 5.1 I

13、TU-T G.798 (2012) Amd. 1 2014-05-14 15 11.1002/1000/12179 5.2 ITU-T G.798 (2012) Amd. 2 2015-01-13 15 11.1002/1000/12367 5.3 ITU-T G.798 (2012) Cor.1 2015-08-13 15 11.1002/1000/12529 5.4 ITU-T G.798 (2012) Amd. 3 2017-01-12 15 11.1002/1000/13081 6.0 ITU-T G.798 2017-12-07 15 11.1002/1000/13335 Keywo

14、rds Atomic functions, equipment functional blocks, functional specification, optical transport network, OTN. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.10

15、02/1000/11830-en. ii Rec. ITU-T G.798 (12/2017) 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 perma

16、nent 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 Standardization Assembly (WTSA), which meets every four years, establis

17、hes 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 technology which fall within ITU-Ts purview, the necessary standa

18、rds 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. Compliance with this Recommendation is voluntary. However, the Recom

19、mendation 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 obligatory language such as “must“ and the negative equivalents a

20、re 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 implementation of this Recommendation may involve the use of a claimed Int

21、ellectual 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 of the date of approval of this Recommendation, ITU had received

22、 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 to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/.

23、ITU 2018 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.798 (12/2017) iii Table of Contents Page 1 Scope . 1 2 References . 5 3 Definitions 7 3.1 Terms defined elsewhere 7 3.2 Terms defined in thi

24、s Recommendation . 9 4 Abbreviations and acronyms 9 5 Conventions 17 6 Supervision . 17 6.1 Alarm reporting control 17 6.2 Defects 17 6.3 Consequent actions . 28 6.4 Defect correlations 28 6.5 Performance filters . 28 7 Information flow across reference points . 30 8 Generic processes . 30 8.1 Blank

25、 clause 30 8.2 Alignment processes . 30 8.3 Signal quality supervision 33 8.4 Blank clause 35 8.5 OTUk forward error correction (FEC) processing . 35 8.6 Trail trace identifier (TTI) processing 35 8.7 Payload structure indication (PSI) acceptance processes . 35 8.8 Status information (STAT) acceptan

26、ce process . 36 8.9 Generic AIS generation and detection 37 8.10 Generic layer fault processing 37 8.11 OTSi modulator and demodulator processes 40 9 OTS-O layer functions 41 9.1 Connection functions 41 9.2 Termination functions 41 9.3 Adaptation functions 46 10 OMS-O layer functions . 48 10.1 Conne

27、ction functions 49 10.2 Termination functions 49 10.3 Adaptation functions 54 10.4 Sub-layer functions . 61 11 OSC (layer) functions . 62 11.1 Connection functions 65 iv Rec. ITU-T G.798 (12/2017) Page 11.2 Termination functions 65 11.3 Adaptation functions 66 12 OTSiA and OCh (layer) functions 70 1

28、2.1 Connection functions 72 OTSiA|OCh_C_MP: 73 12.2 Termination functions 76 12.3 Adaptation functions 86 12.4 Sub-layer functions . 87 13 OTU (layer) functions . 87 13.1 Connection functions 88 13.2 Termination functions 88 13.3 Adaptation functions 100 13.4 Sub-layer functions . 113 14 ODU (layer)

29、 functions 113 14.1 Connection functions 116 14.2 Termination functions 126 14.3 Adaptation functions 133 14.4 COMMS functions . 249 14.5 Sub-layer functions . 257 14.6 Blank clause 278 15 FlexO functions 279 15.1 Connection functions 279 15.2 Termination functions 279 15.3 Adaptation functions 283

30、16 OTSi adaptation functions 292 16.1 OTSi to OTUk adaptation function (OTSi/OTUk_A) 292 16.2 OTSi to OTUkV adaptation function (OTSi/OTUkV_A) 296 16.3 OTSiG to OTUk adaptation function (OTSiG/OTUk_A) 298 16.4 OTSiG to OTUkV adaptation function (OTSiG/OTUkV_A) 305 16.5 OTSi to OTUCn adaptation funct

31、ion (OTSi/OTUCn_A) 308 16.6 OTSiG to OTUCn adaptation function (OTSiG/OTUCn_A) 310 16.7 OTSi to FlexO adaptation function (OTSiG/FlexO_A) . 312 16.8 OTSiG to FlexO adaptation function (OTSiG/FlexO_A) 312 16.9 OTSi to OSC adaptation function (OTSi/OSC_A) 316 17 Media element 318 Annex A Optical secti

32、on (OSx) and constant bit rate (CBRx) layer functions 321 A.1 Connection functions 322 A.2 Termination functions 322 A.3 Adaptation functions 325 Rec. ITU-T G.798 (12/2017) v Page Annex B Generic FlexE and FlexO supervision and processes 338 B.1 Supervision . 338 B.2 Generic processes . 339 Appendix

33、 I Applications and functional diagrams . 341 I.1 Transparent CBRx tributary interface port with optional SDH RS non-intrusive monitor on OTN equipment 341 I.2 SOTU tributary interface port on OTN equipment 342 I.3 Selectable CBRx/SOTU tributary interface port on OTN equipment 344 I.4 SOTU interface

34、 ports on non-OTN equipment 345 I.5 MOTUm interface port with 3-R regeneration functionality for an ODUk connection function 347 Appendix II Blank appendix . 349 Appendix III Performance of processes 350 III.1 Introduction 350 III.2 OTUk frame alignment process 350 III.3 STAT acceptance process and

35、related defect detection . 352 III.4 OTU dIAE, OTU dBDI, ODU dBDI detection 353 III.5 PT acceptance process and ODUPdPLM detection . 354 III.6 Generic AIS and OTUk AIS detection . 355 III.7 OTU and ODUT dBIAE detection process 355 Appendix IV TTI processing examples 358 IV.1 Example 1 . 358 IV.2 Exa

36、mple 2 . 359 Appendix V Blank appendix . 363 Appendix VI OTSi client mapping of pre-OTN signals . 364 VI.1 OTSi to CBRx adaptation (OTSi/CBRx_A) 364 VI.2 OTSi to GbE adaptation function (OTSi/GbE_A) . 366 VI.3 OTSi to RSn adaptation (OTSi/RSn_A) . 366 Appendix VII Examples of media elements . 370 Ap

37、pendix VIII OMS trail protection . 372 VIII.1 OMS trail protection sub-layer functions . 372 Bibliography. 379 vi Rec. ITU-T G.798 (12/2017) Introduction This Recommendation forms part of a suite of Recommendations covering the full functionality of network equipment (e.g., ITU-T G.783, ITU-T G.705,

38、 ITU-T G.781 and ITU-T G.784) and follows the principles defined in ITU-T G.806. This Recommendation specifies a library of basic building blocks and a set of rules by which they may be combined to describe equipment used in an optical transport network. The library comprises the functional building

39、 blocks needed to specify completely the generic functional structure of the optical transport network. In order to be compliant with this Recommendation, the OTN functionality of any equipment which processes at least one of the OTN layers needs to be describable as an interconnection of a subset o

40、f the functional blocks contained within this Recommendation. The interconnections of these blocks should obey the combination rules given. The specification method is based on the functional decomposition of the equipment into atomic and compound functions. The equipment is then described by its eq

41、uipment functional specification (EFS) which lists the constituent atomic and compound functions, their interconnection and any overall performance objectives (e.g., transfer delay, availability, etc.). Rec. ITU-T G.798 (12/2017) 1 Recommendation ITU-T G.798 Characteristics of optical transport netw

42、ork hierarchy equipment functional blocks 1 Scope This Recommendation covers the functional requirements of optical transport network functionality within equipment. This Recommendation uses the specification methodology defined in ITU-T G.806, in general for transport network equipment, and is base

43、d on the architecture of optical transport networks defined in ITU-T G.872 and the interfaces for optical transport networks defined in ITU-T G.709. The description is generic and no particular physical partitioning of functions is implied. The input/output information flows associated with the func

44、tional blocks serve for defining the functions of the blocks and are considered to be conceptual, not physical. The functionality defined in this Recommendation can be applied at user-to-network interfaces (UNIs) and network node interfaces (NNIs) of the optical transport network. It is recognized t

45、hat for interfaces used within optical subnetworks, aspects of the interface are optical technology dependent and subject to change as technology progresses. Therefore, optical-technology dependent aspects (for transverse compatibility) are not defined for functional blocks used for these interfaces

46、 to allow for technology changes. The overhead processing functionality necessary for operations and management of optical subnetworks is defined. Not every functional block defined in this Recommendation is required for every application. Different subsets of functional blocks from this Recommendat

47、ion and others (e.g., ITU-T G.783) may be assembled in different ways according to the combination rules given in these Recommendations to provide a variety of different capabilities. Network operators and equipment suppliers may choose which functions must be implemented for each application. The i

48、nternal structure of the implementation of this functionality (equipment design) need not be identical to the structure of the functional model, as long as all the details of the externally observable behaviour comply with the equipment functional specification (EFS). Equipment developed prior to th

49、e production of this Recommendation may not comply in all details with this Recommendation. Equipment which is normally stated to be compliant with this Recommendation may not fulfil all the requirements in the case that it is interworking with old equipment that is not compliant with this Recommendation. Figures 1-1, 1-2 and 1-5 present the set of atomic functions associated with traffic signal transport. The functions for the processing of communicati