1、 International Telecommunication Union ITU-T G.783TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2006) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Principal characteristics of multiplexing equipment for the synchronous digital hierarchy Cha
2、racteristics of synchronous digital hierarchy (SDH) equipment functional blocks ITU-T Recommendation G.783 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 ANA
3、LOGUE CARRIER-TRANSMISSION 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 COO
4、RDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 General G.700G.709 Coding of analogue signals by pulse code modulation G.710G.719 Coding of analogue signals by methods other than PCM G.720G.729 Principal c
5、haracteristics of primary multiplex equipment G.730G.739 Principal characteristics of second order 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 Operation
6、s, administration and maintenance features of transmission equipment G.770G.779 Principal characteristics 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 QUA
7、LITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 ETHERNET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of IT
8、U-T Recommendations. ITU-T Rec. G.783 (03/2006) i ITU-T Recommendation G.783 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks Summary This Recommendation specifies both the components and the methodology that should be used in order to specify SDH functionality of n
9、etwork elements; it does not specify an individual SDH equipment as such. This Recommendation forms part of a suite of Recommendations covering the full functionality of network equipment. These Recommendations are ITU-T Recs G.806 13 (Conventions and Generic Equipment Functions), G.783, G.705 (PDH
10、functions) 5, G.781 9 (Synchronization functions), G.784 (Management function) 10 and I.732 21 (ATM functions) and follow the principles defined in ITU-T Rec. G.803 11. This Recommendation specifies a library of basic building blocks and a set of rules by which they may be combined in order to descr
11、ibe a digital transmission equipment. The library comprises the functional building blocks needed to specify completely the generic functional structure of the Synchronous Digital Hierarchy. In order to be compliant with this Recommendation, equipment needs to be describable as an interconnection of
12、 a subset of these functional blocks contained within this Recommendation. The interconnections of these blocks should obey the combination rules given. The specification method is based on functional decomposition of the equipment into atomic, and compound functions. The description is generic and
13、no particular physical partitioning of functions is implied. The input/output information flows associated with the functional blocks serve for defining the functions of the blocks and are considered to be conceptual, not physical. Not every atomic function defined in this Recommendation is required
14、 for every application. Different subsets of atomic functions may be assembled in different ways according to the combination rules given in this Recommendation to provide a variety of different capabilities. Network operators and equipment suppliers may choose which functions must be implemented fo
15、r each application. Source ITU-T Recommendation G.783 was approved on 29 March 2006 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.783 (03/2006) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the
16、 field of telecommunications. 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. Th
17、e 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 Resolution
18、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 and a
19、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 met. Th
20、e 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 possibility
21、 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 Recomme
22、ndation 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, implementors are cautioned that this may not represent the latest information and a
23、re therefore strongly urged to consult the TSB patent database. ITU 2006 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.783 (03/2006) iii CONTENTS Page 1 Scope 1 2 References. 3 3 Terms and defini
24、tions . 4 4 Abbreviations 7 5 Conventions 14 5.1 SDH-specific transmission layer names. 14 5.2 Performance and reliability 14 6 Supervision . 15 6.1 Trail termination point mode and port mode 15 6.2 Defects 15 6.3 Consequent actions. 17 6.4 Defect correlations 17 6.5 One-second performance monitorin
25、g filter 17 7 Information flow (XXX_MI) across the XXX_MP reference points. 17 8 Generic processes . 17 8.1 Line coding and scrambling processes. 17 8.2 Alignment processes. 17 8.3 Signal quality supervision processes 21 8.4 BIP correction processes 23 9 STM-N physical section layer (N = 1, 4, 16, 6
26、4, 256) . 23 9.1 Connection functions 24 9.2 Termination functions 24 9.3 Adaptation functions 28 9.4 Sublayer functions (N/A) . 34 10 STM-N regenerator section layer (N = 1, 4, 16, 64, 256) 34 10.1 Connection functions 36 10.2 Termination functions 36 10.3 Adaptation functions 39 10.4 Sublayer func
27、tions 52 11 STM-N multiplex section layer (N = 1, 4, 16, 64, 256) . 53 11.1 Connection functions 54 11.2 Termination functions 54 11.3 Adaptation functions 57 11.4 Sublayer functions 67 12 VC-n path (Sn) layer (n = 4-X, 4, 3-X, 3) 96 12.1 Connection functions 107 12.2 Termination functions 112 iv IT
28、U-T Rec. G.783 (03/2006) Page 12.3 Adaptation functions 123 12.4 Sublayer functions 139 12.5 Virtual concatenation functions 167 13 VC-m path (Sm) layer (m = 2, 12, 11) . 187 13.1 Connection functions 194 13.2 Termination functions 199 13.3 Adaptation functions 210 13.4 Sublayer functions 215 13.5 V
29、irtual concatenation functions 233 14 Timing functions. 245 15 Specification of jitter and wander. 245 15.1 STM-N interfaces . 245 15.2 PDH interfaces 248 15.3 Jitter and wander measurement 264 16 Overhead access function (OHA). 264 Annex A Algorithm for pointer detection. 265 A.1 Pointer interpreta
30、tion 265 A.2 Concatenated payloads . 267 A.3 Pointer processing flow chart . 268 Appendix I Example of F1 byte usage 270 Appendix II Data communications channel (DCC) 271 Appendix III STM-16 regenerator functional model (example). 272 Appendix IV STM-N transparent regenerator 274 Appendix V Verifica
31、tion of SDH equipment CID immunity. 275 V.1 Background. 275 V.2 Method 275 Appendix VI Enhanced remote defect indication operation. 277 VI.1 VC-4-Xc/VC-4/VC-3 paths 277 VI.2 VC-2/VC-12/VC-11 paths 277 VI.3 Interworking functions . 277 Appendix VII STM-64 regenerator jitter accumulation analyses and
32、hypothetical reference model (HRM) 278 VII.1 Introduction 278 VII.2 STM-64 regenerator hypothetical reference model 278 VII.3 STM-64 (Type A) regenerator jitter accumulation simulation model, analyses, and results . 279 ITU-T Rec. G.783 (03/2006) 1 ITU-T Recommendation G.783 Characteristics of synch
33、ronous digital hierarchy (SDH) equipment functional blocks 1 Scope This Recommendation defines a library of basic building blocks and a set of rules by which they may be combined in order to describe a digital transmission equipment. The library comprises the functional building blocks needed to spe
34、cify completely the generic functional structure of the Synchronous Digital Hierarchy. These building blocks are illustrated in Figure 1-1. In order to be compliant with this Recommendation, equipment needs to be describable as an interconnection of a subset of these functional blocks contained with
35、in this Recommendation. The interconnections of these blocks should obey the combination rules given. This Recommendation defines both the components and the methodology that should be used in order to specify SDH processing; it does not define an individual SDH equipment as such. The specification
36、method is based on functional decomposition of the equipment into atomic and compound functions. The equipment is then described by its Equipment Functional Specification (EFS) which lists the constituent atomic and compound functions, their interconnection, and any overall performance objectives (e
37、.g., transfer delay, availability, etc.). The internal 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 behavior comply with the EFS. The equipment function
38、ality is consistent with the SDH multiplexing structure given in ITU-T Rec. G.707/Y.1322. Equipment developed prior to the production of this version of the Recommendation may not comply in all details with this Recommendation. Equipment which is normally stated to be compliant with this Recommendat
39、ion may not fulfil all the requirements where it is interworking with old equipment that is not compliant with this Recommendation. 2 ITU-T Rec. G.783 (03/2006) TO_TPOSn_CPOSnOSnOSn/RSn OSn/RSnOSnES1ES1_CPES1/RS1ES1ES1/RS1ES1RSnRSnRSnRSn/DCC RSn/OWMSn/SDRSn/MSnMSn/SD MSn/OW MSn/DCCRSn_CP RS1_CPD1-D3
40、 E1 F1 F1 E1 D1-D3MSnMSn MSnMSn/DCC MSn/OWRSn/User RSn/MSn RSn/User RSn/OW RSn/DCCMSn_CP MSn_CPMSn/Sn MSn/SnD4-D12 E2 D4-D12E2Sn_CP Sn_CPSnD/SnSnDSnD/SnSnDSnD_APSn_RITSFSDSn SnSn_RISnsSnsSn_RITSFTSDTSFTSDSn/Pqx Sn/User Sn/Pqx Sn/UserPqx_CP User_CP Pqx_CP User_CPSmTSFSDSM_RITSFTSDTSFTSDPqx_CP Pqx_CPP
41、qs_CP Pqs_CPMSn_RILower order path layerHigher order path layerMultiplex section layerRegenerator section layerSDH physical layersFigure 1-1/G.783 General functional block diagram ITU-T Rec. G.783 (03/2006) 3 2 References The following ITU-T Recommendations and other references contain provisions wh
42、ich, 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 Recommendation are therefore encouraged to investigate the possibility of
43、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 not give it, as a stand-alone document, the status of a Recommendation. 1
44、 ITU-T Recommendation G.664 (2006), Optical safety procedures and requirements for optical transport systems. 2 ITU-T Recommendation G.691 (2006), Optical interfaces for single-channel STM-64 and other SDH systems with optical amplifiers. 3 ITU-T Recommendation G.703 (2001), Physical/electrical char
45、acteristics of hierarchical digital interfaces. 4 ITU-T Recommendation G.704 (1998), Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels. 5 ITU-T Recommendation G.705 (2000), Characteristics of plesiochronous digital hierarchy (PDH) equipment functional
46、blocks. 6 ITU-T Recommendation G.707/Y.1322 (2003), Network node interface for the synchronous digital hierarchy (SDH). 7 ITU-T Recommendation G.743 (1988), Second order digital multiplex equipment operating at 6312 kbit/s and using positive justification. 8 ITU-T Recommendation G.752 (1988), Charac
47、teristics of digital multiplex equipments based on a second order bit rate of 6312 kbit/s and using positive justification. 9 ITU-T Recommendation G.781 (1999), Synchronization layer functions. 10 ITU-T Recommendation G.784 (1999), Synchronous digital hierarchy (SDH) management. 11 ITU-T Recommendat
48、ion G.803 (2000), Architecture of transport networks based on the synchronous digital hierarchy (SDH). 12 ITU-T Recommendation G.805 (2000), Generic functional architecture of transport networks. 13 ITU-T Recommendation G.806 (2006), Characteristics of transport equipment Description methodology and
49、 generic functionality. 14 ITU-T Recommendation G.813 (2003), Timing characteristics of SDH equipment slave clocks (SEC). 15 ITU-T Recommendation G.823 (2000), The control of jitter and wander within digital networks which are based on the 2048 kbit/s hierarchy. 16 ITU-T Recommendation G.824 (2000), The control of jitter and wander within digital networks which are based on the 1544 kbit/s hierarchy. 17 ITU-T Recommendation G.825 (2000), The control of jitter and wander within digital networks wh
