ITU-T Y 1322-2007 Network node interface for the synchronous digital hierarchy (SDH) (Study Group 15)《(预发布)同步数字系列(SDH)的网络结点接口》.pdf

1、 International Telecommunication Union ITU-T G.707/Y.1322TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2007) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments General SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEX

2、T-GENERATION NETWORKS Internet protocol aspects Transport Network node interface for the synchronous digital hierarchy (SDH) ITU-T Recommendation G.707/Y.1322 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS

3、G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE 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 AN

4、D INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND 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 analogue signals by pulse code modulation G.710G.719 Cod

5、ing of analogue signals by methods other than PCM G.720G.729 Principal characteristics 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

6、 of transcoder and digital multiplication equipment G.760G.769 Operations, 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 NET

7、WORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY 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 PACKET OVER TRANSPORT ASPECTS G.8000G.8999ACCESS NETW

8、ORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.707/Y.1322 (01/2007) i ITU-T Recommendation G.707/Y.1322 Network node interface for the synchronous digital hierarchy (SDH) Summary This Recommendation provides the requirements for the STM-N signa

9、ls at the network node interface of a synchronous digital network, including B-ISDN in terms of: bit rates; frames structures; formats for mapping and multiplexing of client signals (e.g., PDH, ATM and Ethernet) elements; functionalities of the overheads. Revision 7.0 of ITU-T Recommendation G.707/Y

10、.1322 is based on: revision 6.0 approved 2003-12-14; Corrigendum 1 approved 2004-06-13; Amendment 1 approved 2004-08-22; Corrigendum 2 approved 2005-08-22; and editorial (non-technical) corrections. Amendment 1 provides a reciprocal linkage from the SDH Recommendation to the G-PON Recommendation G.9

11、84.3, and explains how the G-PON encapsulation method (GEM) transport of SDH signals fits into the multiplexing hierarchy. Source ITU-T Recommendation G.707/Y.1322 was approved on 9 January 2007 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommendation A.8 procedure, including Amendment 1 t

12、o ITU-T Recommendation G.707/Y.1322 (2007), which was approved on 29 July 2007 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommendation A.8 procedure. History 1.0 G.707 1988-11-25 2.0 G.707 1991-04-05 3.0 G.707 1993-03-12 4.0 G.707 1996-03-20 5.0 G.707/Y.1322 2000-10-06 5.1 G.707/Y.1322 (2

13、000) Cor.1 2001-03-15 5.2 G.707/Y.1322 (2000) Cor.2 2001-11-29 5.3 G.707/Y.1322 (2000) Amend.1 2001-11-29 5.4 G.707/Y.1322 (2000) Amend.2 2002-08-06 5.4 G.707/Y.1322 (2000) Cor.3 2003-03-16 5.5 G.707/Y.1322 (2000) Amend.3 2003-04-13 6.0 G.707/Y.1322 2003-12-14 6.1 G.707/Y.1322 (2004) Cor.1 2004-06-1

14、3 6.2 G.707/Y.1322 (2004) Amend.1 2004-08-22 6.3 G.707/Y.1322 (2005) Cor.2 2005-08-22 7.0 G.707/Y.1322 2007-01-09 7.1 G.707/Y.1322 (2007) Amend.1 2007-07-29 ii ITU-T Rec. G.707/Y.1322 (01/2007) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the f

15、ield 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. The

16、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 1.

17、 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 re

18、cognized 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. The

19、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 t

20、hat 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 Recommend

21、ation 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 and are

22、 therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2008 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.707/Y.1322 (01/2007) iii CONTENTS Page 1 Scope

23、 1 2 References 1 3 Terms and definitions. 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation. 3 4 Acronyms and abbreviations 4 5 Conventions 6 6 Basic multiplexing principles. 7 6.1 Multiplexing structure 7 6.2 Basic frame structure 11 6.3 Hierarchical bit rates 15 6.4 Interco

24、nnection of STM-Ns . 16 6.5 Scrambling . 17 6.6 Physical specification of the NNI. 18 7 Multiplexing method 18 7.1 Multiplexing of administrative units into STM-N . 18 7.2 Multiplexing of tributary units into VC-4 and VC-3 . 23 7.3 AU-n/TU-n numbering scheme 27 8 Pointers. 49 8.1 AU-n pointer 49 8.2

25、 TU-3 pointer. 56 8.3 TU-2, TU-12 and TU-11 pointers 59 9 Overhead bytes description 64 9.1 Types of overhead 64 9.2 SOH description . 64 9.3 POH descriptions 77 10 Mapping of tributaries into VC-n/VC-m 85 10.1 Mapping of G.702 type signals 85 10.2 Mapping of ATM cells. 100 10.3 Mapping of HDLC fram

26、ed signals. 105 10.4 Mapping of DQDB into VC-4 106 10.5 Asynchronous mapping for FDDI at 125 000 kbit/s into VC-4. 106 10.6 Mapping of GFP frames. 107 10.7 Asynchronous mapping of ODUk into a C-4-X transported via a VC-4-Xv. 108 iv ITU-T Rec. G.707/Y.1322 (01/2007) Page 11 VC concatenation . 113 11.

27、1 Contiguous concatenation of X VC-4s (VC-4-Xc, X = 4, 16, 64, 256). 113 11.2 Virtual concatenation of X VC-3s/VC-4s (VC-3-Xv/VC-4-Xv, X = 1 . 256). 114 11.3 Contiguous concatenation of X VC-2s in a higher order VC-3 (VC-2-Xc, X = 1 7) . 120 11.4 Virtual concatenation of X VC-11/VC-12/VC-2 . 120 Ann

28、ex A Forward error correction for STM-64, and STM-256. 126 A.1 Network reference model. 126 A.2 The FEC function. 126 A.3 Mapping into the SDH frame. 127 A.4 In-band FEC regenerator functions 129 A.5 Performance monitoring. 129 A.6 FEC activation and deactivation 130 A.7 Performance of in-band FEC 1

29、31 Annex B CRC-7 polynomial algorithm 132 B.1 Multiplication/division process 132 B.2 Encoding procedure 132 B.3 Decoding procedure . 132 Annex C VC-4-Xc/VC-4/VC-3 tandem connection monitoring protocol: Option 1 . 133 C.1 Tandem connection overhead Byte location . 133 C.2 Definitions 135 C.3 Tandem

30、connection bundling. 135 C.4 Incoming error count (IEC) 136 C.5 B3 compensation 138 C.6 Data link . 139 C.7 Treatment of incoming signal failures . 146 C.8 Tandem connection idle signal. 148 C.9 Tandem connection test signal . 148 Annex D VC-4-Xc/VC-4/VC-3 tandem connection monitoring protocol: Opti

31、on 2 . 149 D.1 N1 byte structure 149 D.2 TCM functionality at the tandem connection source . 150 D.3 TCM functionality at the tandem connection sink. 151 D.4 BIP-8 compensation . 152 Annex E VC-2, VC-12 and VC-11 tandem connection monitoring protocol 153 E.1 N2 byte structure 153 E.2 TCM functionali

32、ty at the tandem connection source . 154 E.3 TCM functionality at the tandem connection sink. 154 E.4 BIP-2 compensation . 155 ITU-T Rec. G.707/Y.1322 (01/2007) v Page Annex F Transport of 10 Gbit/s Ethernet in a VC-4-64c . 156 F.1 Mapping of Ethernet MAC into VC-4-64c using 64B/66B coding . 156 Ann

33、ex G Mapping of N TU-12 in M virtual concatenated SHDSL pairs (dSTM-12NMi). 157 G.1 Multiplex structure . 157 G.2 Mapping overview 159 Annex H Mapping of TU-11, TU-12, TU-2 and TU-3 in G-PON GEM connections . 160 H.1 Multiplex structure . 160 H.2 Mapping overview 160 Appendix I Relationship between

34、TU-2 address and location of columns within a VC-4. 162 Appendix II Relationship between TU-12 address and location of columns within a VC-4 . 163 Appendix III Relationship between TU-11 address and location of columns within a VC-4 . 165 Appendix IV Relationship between TU-2 address and location of

35、 columns within a VC-3 . 168 Appendix V Relationship between TU-12 address and location of columns within a VC-3 . 169 Appendix VI Relationship between TU-11 address and location of columns within a VC-3 . 170 Appendix VII Enhanced remote defect indication (ERDI) 171 VII.1 VC-4-Xc/VC-4/VC-3 paths 17

36、1 VII.2 VC-2, VC-12 and VC-11 paths 172 Appendix VIII Unexpected behaviour, dependence of TC monitoring on the incoming signal 174 VIII.1 Entering AIS condition (in case of VC-3/VC-4/VC-4-Xc) 174 VIII.2 Entering AIS condition (in case of VC-11/VC-12/VC-2) 174 VIII.3 Recovery from a phase jump (valid

37、 for all VC-n) . 174 Appendix IX Forward error correction for STM-16. 175 Appendix X Performance of in-band FEC . 176 Appendix XI Nominal justification ratios for asynchronous mapping of ODU1 into C-4-17 and ODU2 into C-4-68. 179 Appendix XII Consideration on 10 Gbit/s Ethernet WAN clock accuracy 18

38、2 Appendix XIII Example LCAS control packet CRC calculations . 183 XIII.1 Example of CRC-8 computation for LCAS and virtual concatenation carried in the H4 byte (i.e., VC-3-Xv and VC-4-Xv) 183 XIII.2 Example of CRC-3 computation for LCAS and virtual concatenation carried in bit 2 of the K4 byte (i.e

39、., VC-2-Xv, VC-12-Xv and VC-11-Xv). 184 Appendix XIV Mapping serial data into a VCG 185 Bibliography 186 ITU-T Rec. G.707/Y.1322 (01/2007) 1 ITU-T Recommendation G.707/Y.1322 Network node interface for the synchronous digital hierarchy (SDH) 1 Scope This Recommendation covers the network node interf

40、ace (NNI) specifications which are necessary to enable interconnection of network elements at their synchronous digital hierarchy (SDH) interfaces for the transport of different types of payloads. Therefore, this Recommendation specifies: the bit rates for STM-N signals; the frames structures for ST

41、M-N signals; the formats for mapping and multiplexing of client signals (e.g., PDH, ATM and Ethernet) elements into an STM-N frame; the functionalities to be implemented in the different overheads of an STM-N frame; at the NNI of a synchronous digital network, including B-ISDN. 2 References The foll

42、owing 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 Reco

43、mmendation 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 not

44、 give it, as a stand-alone document, the status of a Recommendation. ITU-T Recommendation G.691 (2006), Optical interfaces for single-channel STM-64 and other SDH systems with optical amplifiers. ITU-T Recommendation G.702 (1988), Digital hierarchy bit rates. ITU-T Recommendation G.703 (2001), Physi

45、cal/electrical characteristics of hierarchical digital interfaces. ITU-T Recommendation G.704 (1998), Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels. ITU-T Recommendation G.709/Y.1331 (2003), Interfaces for the Optical Transport Network (OTN). ITU-T

46、 Recommendation G.780/Y.1351 (2004), Terms and definitions for synchronous digital hierarchy (SDH) networks. ITU-T Recommendation G.783 (2006), Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks. ITU-T Recommendation G.7041/Y.1303 (2005), Generic framing procedure (GF

47、P). ITU-T Recommendation G.7042/Y.1305 (2006), Link capacity adjustment scheme (LCAS) for virtual concatenated signals. ITU-T Recommendation G.802 (1988), Interworking between networks based on different digital hierarchies and speech encoding laws. ITU-T Recommendation G.803 (2000), Architecture of

48、 transport networks based on the synchronous digital hierarchy (SDH). 2 ITU-T Rec. G.707/Y.1322 (01/2007) ITU-T Recommendation G.806 (2006), Characteristics of transport equipment Description methodology and generic functionality. ITU-T Recommendation G.831 (2000), Management capabilities of transpo

49、rt networks based on the synchronous digital hierarchy (SDH). ITU-T Recommendation G.841 (1998), Types and characteristics of SDH network protection architectures. ITU-T Recommendation G.957 (2006), Optical interfaces for equipments and systems relating to the synchronous digital hierarchy. ITU-T Recommendation G.984.3 (2004), Gigabit-capable Passive Optical Networks (G-PON): Transmission convergence layer specifications.