1、 International Telecommunication Union ITU-T G.806TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2012) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital networks General aspects Characteristics of transport equipment Description methodology and generic functionality
2、 Recommendation ITU-T G.806 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 INT
3、ERNATIONAL 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 AN
4、D OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 General aspects G.800G.809Design objectives for digital networks G.810G.819 Quality and availability targets G.820G.829 Network capabilities and functions G.830G.839 SDH network characteri
5、stics G.840G.849 Management of transport network G.850G.859 SDH radio and satellite systems integration G.860G.869 Optical transport networks G.870G.879 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRA
6、NSMISSION 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.806 (02/2012) i Recommendation ITU-T G.806 Charac
7、teristics of transport equipment Description methodology and generic functionality Summary Recommendation ITU-T G.806 specifies the methodology, generic functionality and components that should be used in order to specify transport network functionality of network elements; it does not specify indiv
8、idual transport network equipment as such. It is the baseline Recommendation for other standards that specify the characteristics of equipment for specific transport networks (e.g., synchronous digital hierarchy (SDH), plesiochronous digital hierarchy (PDH). History Edition Recommendation Approval S
9、tudy Group 1.0 ITU-T G.806 2000-10-06 15 1.1 ITU-T G.806 (2000) Amd. 1 2003-03-16 15 2.0 ITU-T G.806 2004-02-06 15 2.1 ITU-T G.806 (2004) Amd. 1 2004-06-13 15 2.2 ITU-T G.806 (2004) Cor. 1 2004-08-22 15 2.3 ITU-T G.806 (2004) Cor. 2 2005-01-13 15 3.0 ITU-T G.806 2006-03-29 15 3.1 ITU-T G.806 (2006)
10、Amd. 1 2008-11-22 15 4.0 ITU-T G.806 2009-01-13 15 4.1 ITU-T G.806 (2009) Amd. 1 2011-06-22 15 5.0 ITU-T G.806 2012-02-13 15 ii Rec. ITU-T G.806 (02/2012) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information
11、 and communication 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
12、 basis. 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 R
13、esolution 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 administrat
14、ion and 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
15、 are met. 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
16、 possibility 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
17、 the Recommendation development process. As of the date of approval of this Recommendation, ITU had not 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 i
18、nformation 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.806 (02/2012) iii Table of C
19、ontents Page 1 Scope 1 2 References. 1 3 Definitions 3 3.1 Terms defined elsewhere 3 3.2 Terms defined in this Recommendation . 3 4 Abbreviations and acronyms 6 5 Methodology . 14 5.1 Basic methodology . 14 5.2 Transmission layer naming . 16 5.3 Atomic function naming and diagrammatic conventions .
20、17 5.4 Reference point naming 21 5.5 Reference point information naming 23 5.6 Atomic function process allocation 24 5.7 Combination rules 30 5.8 Fault management and performance monitoring naming . 34 5.9 Fault management and performance monitoring specification techniques 34 6 Supervision . 35 6.1
21、 Trail termination point mode and port mode 37 6.2 Defect filter . 37 6.3 Consequent actions . 54 6.4 Defect correlations 60 6.5 One-second performance monitoring filters . 61 7 Information flow (XXX_MI) across the XXX_MP reference points . 63 8 Generic processes . 65 8.1 Line coding and scrambling
22、processes . 65 8.2 Alignment processes . 65 8.3 Performance supervision process . 66 8.4 BIP correction . 69 8.5 GFP processes 69 9 Performance and reliability 83 9.1 Transit delay . 83 9.2 Response times . 83 9.3 Availability and reliability 83 9.4 Laser safety . 84 10 Generic equipment functions 8
23、4 10.1 LCAS-capable virtual concatenated path layer functions P-Xv-L (X 1) 84 iv Rec. ITU-T G.806 (02/2012) Page Annex A Assignment and use of signal label, payload type and user payload identifier codes . 107 A.1 Experimental code 107 A.2 Proprietary codes 107 A.3 Request for standardized codes 107
24、 Annex B P-Xv/P-X-L_A_Sk: Calculation of RI_MST_gen for _LCASActive = true 108 Appendix I Connection matrix examples 109 I.1 Connection matrix example for full connectivity . 109 I.2 Connection matrix example for 2-port groups . 110 I.3 Connection matrix example for 3-port groups type I . 110 I.4 Co
25、nnection matrix example for 3-port groups type II 111 I.5 Connection matrix example for 4-port groups type I . 111 I.6 Connection matrix example for 4-port groups type II 112 I.7 Example of a provisioned connection matrix . 112 I.8 Connection matrix example for 3-port groups (address slot group swit
26、ching) . 113 I.9 Connection matrix example for 4-port groups (address slot group switching) . 113 Appendix II Example of remote indication operation 115 II.1 Remote defect indication (RDI) . 115 II.2 Remote error indication (REI) 116 Appendix III Alarm indication signal (AIS) . 118 Appendix IV Signa
27、l fail (SF) and signal degrade (SD) 120 IV.1 Server signal fail (SSF) signal 120 IV.2 Server signal degrade (SSD) signal 120 IV.3 Trail signal fail (TSF) signal 120 IV.4 Trail signal degrade (TSD) signal 120 Appendix V Description of error detection code (EDC) terminology N BIP-m . 121 Appendix VI C
28、alculations leading to BIP saturation results in Tables 6-4 and 6-5 . 124 VI.1 Introduction 124 VI.2 Calculations and results 124 Appendix VII Examples for the operation of the processes within LCAS-capable adaptation functions 126 VII.1 Basic configuration . 126 VII.2 LCAS-enabled So and Sk functio
29、ns . 126 VII.3 LCAS-enabled So and LCAS-disabled Sk functions . 150 VII.4 LCAS-disabled So and LCAS-enabled Sk functions . 150 VII.5 Non-virtual-concatenation So and LCAS-capable virtual-concatenation Sk functions 150 Rec. ITU-T G.806 (02/2012) v Page Appendix VIII Consequent actions for signals wit
30、h no AIS/FDI defined 151 Appendix IX Types of flow forwarding processes . 152 Bibliography. 155 Rec. ITU-T G.806 (02/2012) 1 Recommendation ITU-T G.806 Characteristics of transport equipment Description methodology and generic functionality 1 Scope This Recommendation specifies a methodology for des
31、cribing equipment for transport networks based on the transport processing functions and architectural entities defined in ITU-T G.805. It defines the set of generic atomic and compound functions and the set of rules for how to combine them. The detailed characteristics of equipment functional block
32、s of specific transport networks (e.g., SDH, OTN) will be defined in follow-up Recommendations based on this methodology. Equipment can then be described by an equipment functional specification (EFS) which lists the atomic functions and their interconnection. In addition, generic functionality, pro
33、cesses and overall performance objectives for transport networks are defined in this Recommendation. 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 obse
34、rvable behaviour comply with the EFS. 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. 2 References The following ITU-T Recommendation
35、s 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 Recommendation are therefore e
36、ncouraged 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 give it, as a stand-alone
37、 document, the status of a Recommendation. ITU-T E.862 Recommendation ITU-T E.862 (1992), Dependability planning of telecommunication networks. ITU-T G.664 Recommendation ITU-T G.664 (2006), Optical safety procedures and requirements for optical transport systems. ITU-T G.703 Recommendation ITU-T G.
38、703 (2001), Physical/electrical characteristics of hierarchical digital interfaces. ITU-T G.704 Recommendation ITU-T G.704 (1998), Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels. ITU-T G.705 Recommendation ITU-T G.705 (2000), Characteristics of ples
39、iochronous digital hierarchy (PDH) equipment functional blocks. ITU-T G.707 Recommendation ITU-T G.707/Y.1322 (2003), Network node interface for the synchronous digital hierarchy (SDH). ITU-T G.709 Recommendation ITU-T G.709/Y.1331 (2009), Interfaces for the Optical Transport Network (OTN). 2 Rec. I
40、TU-T G.806 (02/2012) ITU-T G.775 Recommendation ITU-T G.775 (1998), Loss of Signal (LOS), Alarm Indication Signal (AIS) and Remote Defect Indication (RDI) defect detection and clearance criteria for PDH signals. ITU-T G.781 Recommendation ITU-T G.781 (2008), Synchronization layer functions. ITU-T G.
41、783 Recommendation ITU-T G.783 (2006), Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks. ITU-T G.784 Recommendation ITU-T G.784 (1999), Synchronous digital hierarchy (SDH) management. ITU-T G.798 Recommendation ITU-T G.798 (2010), Characteristics of optical transpor
42、t network hierarchy equipment functional blocks. ITU-T G.803 Recommendation ITU-T G.803 (2000), Architecture of transport networks based on the synchronous digital hierarchy (SDH). ITU-T G.805 Recommendation ITU-T G.805 (2000), Generic functional architecture of transport networks. ITU-T G.808.1 Rec
43、ommendation ITU-T G.808.1 (2010), Generic protection switching Linear trail and subnetwork protection. ITU-T G.826 Recommendation ITU-T G.826 (2002), End-to-end error performance parameters and objectives for international, constant bit-rate digital paths and connections. ITU-T G.831 Recommendation
44、ITU-T G.831 (2000), Management capabilities of transport networks based on the synchronous digital hierarchy (SDH). ITU-T G.832 Recommendation ITU-T G.832 (1998), Transport of SDH elements on PDH networks Frame and multiplexing structures. ITU-T G.842 Recommendation ITU-T G.842 (1997), Interworking
45、of SDH network protection architectures. ITU-T G.911 Recommendation ITU-T G.911 (1997), Parameters and calculation methodologies for reliability and availability of fibre optic systems. ITU-T G.7041 Recommendation ITU-T G.7041/Y.1303 (2011), Generic framing procedure. ITU-T G.7042 Recommendation ITU
46、-T G.7042/Y.1305 (2006), Link capacity adjustment scheme (LCAS) for virtual concatenated signals. ITU-T G.7710 Recommendation ITU-T G.7710/Y.1701 (2010), Common equipment management function requirements. ITU-T G.8001 Recommendation ITU-T G.8001/Y.1354 (2011), Terms and definitions for Ethernet fram
47、es over transport. ITU-T G.8010 Recommendation ITU-T G.8010/Y.1306 (2004), Architecture of Ethernet layer networks. ITU-T G.8021 Recommendation ITU-T G.8021/Y.1341 (2010), Characteristics of Ethernet transport network equipment functional blocks. ITU-T I.732 Recommendation ITU-T I.732 (2000), Functi
48、onal characteristics of ATM equipment. ITU-T M.20 Recommendation ITU-T M.20 (1992), Maintenance philosophy for telecommunication networks. ITU-T M.125 Recommendation ITU-T M.125 (1988), Digital loopback mechanisms. Rec. ITU-T G.806 (02/2012) 3 3 Definitions 3.1 Terms defined elsewhere This Recommend
49、ation uses the following terms defined elsewhere: 3.1.1 access point (AP): ITU-T G.805. 3.1.2 access point identifier (API): ITU-T G.831. 3.1.3 automatic laser shutdown (ALS): ITU-T G.664. 3.1.4 automatic power shutdown (APSD): ITU-T G.664. 3.1.5 channel identifier (CID): ITU-T G.7041. 3.1.6 client data frame: ITU-T G.7041. 3.1.7 client management frame: ITU-T G.7041. 3.1.8 connection: ITU-T G.805. 3.1.9 flow terminatio
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