1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.8012/Y.1308TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2004) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital networks General aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT
2、GENERATION NETWORKS Internet protocol aspects Transport Ethernet UNI and Ethernet NNI ITU-T Recommendation G.8012/Y.1308 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COM
3、MON 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 AND INTERCONNECTION WITH METALLIC LINES
4、G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TESTING EQUIPMENTS G.500G.599 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMANC
5、E - GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DIGITAL TERMINAL EQUIPMENTS G.7000G.7999 DIGITAL NETWORKS G.8000G.8999 General aspects G.8000G.8099 Design objectives for digital networks G.8100G.8199 Quality and availability targets G.8200G.8299 Netw
6、ork capabilities and functions G.8300G.8399 SDH network characteristics G.8400G.8499 Management of transport network G.8500G.8599 SDH radio and satellite systems integration G.8600G.8699 Optical transport networks G.8700G.8799 For further details, please refer to the list of ITU-T Recommendations. I
7、TU-T Rec. G.8012/Y.1308 (08/2004) i ITU-T Recommendation G.8012/Y.1308 Ethernet UNI and Ethernet NNI Summary This Recommendation specifies the Ethernet UNI and the Ethernet NNI. A set of physical Ethernet interfaces is defined for the Ethernet UNI and the Ethernet NNI. Further, a set of Ethernet ove
8、r Transport interfaces are defined for the Ethernet NNI. The Ethernet over Transport NNI uses various server layer networks like ATM, OTH, PDH and SDH. Source ITU-T Recommendation G.8012/Y.1308 was approved on 22 August 2004 by ITU-T Study Group 15 (2001-2004) under the ITU-T Recommendation A.8 proc
9、edure. ii ITU-T Rec. G.8012/Y.1308 (08/2004) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying t
10、echnical, 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, establishes the topics for study by the ITU-T study groups whi
11、ch, 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 standards are prepared on a collaborative basis with ISO and
12、 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 Recommendation may contain certain mandatory provisions (to
13、 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 are used to express requirements. The use of such words d
14、oes not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concern
15、ing 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 not received notice of intellectual property, protected by pate
16、nts, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2004 All rights reserved. No part of this publication may be reproduced, by any
17、 means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.8012/Y.1308 (08/2004) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terms and definitions . 2 4 Acronyms and abbreviations 2 5 Conventions 5 6 Ethernet transport network interface structure . 5 6.1 UNI and NNI basic signal
18、structure . 9 6.2 Information structure for the ETH interfaces . 11 6.3 MAC address 19 6.4 Tag 20 7 Multiplexing/mapping principles 20 7.1 Mapping 21 7.2 ETH single level VID multiplex. 21 7.3 ETH two level VID multiplex 21 8 Physical specification of the Ethernet interfaces 22 Annex A ETC point-to-
19、point connection 23 Appendix I Ethernet multiplexing. 24 I.1 ETH two level VLAN Multiplex 24 Appendix II 64B/66B link frames over 10GBASE-W and STM-64 25 II.1 64B/66B link frame over STM-64 . 25 II.2 64B/66B link frame over 10GBASE-W. 25 II.3 Differences between 64B/66B link frame over STM-64 and 10
20、GBASE-W 25 BIBLIOGRAPHY 26 ITU-T Rec. G.8012/Y.1308 (08/2004) 1 ITU-T Recommendation G.8012/Y.1308 Ethernet UNI and Ethernet NNI 1 Scope This Recommendation specifies the Ethernet UNI and the Ethernet NNI, where the Ethernet UNI is formed by an Ethernet interface and the Ethernet NNI by an Ethernet
21、interface or an Ethernet over Transport interface. The Ethernet over Transport NNI uses various server layer networks like ATM, OTH, PDH and SDH. The detailed requirements are specified in a number of ITU-T Recommendations, ANSI Standards, IEEE Standards and IETF RFC, which are referred to. 2 Refere
22、nces 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 Recommendations and other references are subject to revision; users
23、 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 published. The reference to a document within this Recommenda
24、tion does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Recommendation G.691 (2003), Optical interfaces for single channel STM-64 and other SDH systems with optical amplifiers. ITU-T Recommendation G.704 (1998), Synchronous frame structures used at 1544, 6312, 2048, 8
25、448 and 44 736 kbit/s hierarchical levels. ITU-T Recommendation G.707/Y.1322 (2003), Network node interface for the synchronous digital hierarchy (SDH). ITU-T Recommendation G.709/Y.1331 (2003), Interfaces for the optical transport network (OTN). ITU-T Recommendation G.832 (1998), Transport of SDH e
26、lements on PDH networks Frame and multiplexing structures, plus Amendment 1 (2004), Payload type code for virtual concatenation of 34 368 kbit/s signals. ITU-T Recommendation G.7041/Y.1303 (2003), Generic framing procedure (GFP). ITU-T Recommendation G.7042/Y.1305 (2004), Link capacity adjustment sc
27、heme (LCAS) for virtual concatenated signals. ITU-T Recommendation G.7043/Y.1343 (2004), Virtual concatenation of plesiochronous digital hierarchy (PDH) signals. ITU-T Recommendation G.8010/Y.1306 (2004), Architecture of Ethernet layer networks. ITU-T Recommendation G.8011/Y.1307 (2004), Ethernet ov
28、er transport Ethernet services framework. ITU-T Recommendation G.8040/Y.1340 (2004), GFP frame mapping into plesiochronous digital hierarchy (PDH). ITU-T Recommendation I.363.5 (1996), B-ISDN ATM Adaptation Layer specification: Type 5 AAL. ITU-T Recommendation X.85/Y.1321 (2001), IP over SDH using L
29、APS, plus Amendment 1 (2004), Bit-oriented method for LAPS. 2 ITU-T Rec. G.8012/Y.1308 (08/2004) ITU-T Recommendation X.86/Y.1323 (2001), Ethernet over LAPS. ITU-T Recommendation Y.1730 (2004), Requirements for OAM functions in Ethernet-based networks and Ethernet services. IEEE Std 802-2001, IEEE S
30、tandard for Local and Metropolitan Area Networks: Overview and Architecture. IEEE Std 802.1D-1998, Information Technology Telecommunications and information exchange between systems Local and metropolitan area networks Common specifications Media Access Control (MAC) Bridges. IEEE Std 802.1Q-2003, I
31、EEE standard for local and metropolitan area networks: Virtual Bridged Local Area Networks. IEEE Std 802.2-1998, Information technology Telecommunications and information exchange between systems Local and metropolitan area networks Specific requirements Part 2: Logical Link Control. IEEE Std 802.3-
32、2002, Information technology Telecommunication and Information Exchange Between Systems LAN/MAN Specific requirements Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications. IEEE Std 802.3ae-2002, IEEE Standard for Carrier Sense Multi
33、ple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications Media Access Control (MAC) Parameters, Physical Layer and Management Parameters for 10 Gb/s Operation. IETF RFC 2684 (1999), Multiprotocol Encapsulation over ATM Adaptation Layer 5. ANSI T1.107 (2002), Digi
34、tal Hierarchy Formats Specifications. 3 Terms and definitions This Recommendation defines the following terms: 3.1 ETH_CI traffic unit: See ITU-T Rec. G.8010/Y.1306. 3.2 network termination: The network element in the transport network, which is connected to the customer edge equipment. 3.3 UNI: An
35、interface that is used for the interconnection of customer equipment with a network element of the transport network. 3.4 Ety-UNI: An UNI for the transfer of ETH_CI traffic unit over a physical Ethernet interface. 3.5 NNI: An interface that is used for the interconnection of networks elements within
36、 a transport network. 3.6 EoT-NNI: An NNI for the transfer of ETH_CI traffic unit over a transport layer network referred to in this Recommendation. 3.7 Ety-NNI: An NNI for the transfer of ETH_CI traffic unit over a physical Ethernet interface. 4 Acronyms and abbreviations This Recommendation uses t
37、he following abbreviations: ANSI American National Standards Institute ATM Asynchronous Transfer Mode C-Tag Customer Tag ITU-T Rec. G.8012/Y.1308 (08/2004) 3 C-VID Customer VID CE Customer Edge CI Characteristic Information DA Destination Address EoA Ethernet over ATM EoM Ethernet over MPLS EoO Ethe
38、rnet over OTH EoP Ethernet over PDH EoR Ethernet over RPR EoS Ethernet over SDH EoT Ethernet over Transport EoT-NNI Ethernet over Transport NNI ETH Ethernet MAC layer network ETH_CI Ethernet MAC Characteristic Information ETHP ETH path layer ETHS ETH segment sublayer ETY Ethernet PHY layer ETYn Ethe
39、rnet PHY layer network of type n Ety-NNI Ethernet NNI Ety-UNI Ethernet UNI Ety-UNI-C Customer side of the Ety-UNI Ety-UNI-N Network side of the Ety-UNI EUG Ethernet Unit Group EUGn EUG level n FCS Frame Check Sequence GFP Generic Framing Procedure GFP-F Generic Framing Procedure Frame Mapped IaDI In
40、tra-Domain Interface IEEE Institute of Electrical and Electronics Engineers IETF Internet Engineering Task Force IrDI Inter-Domain Interface LAN Local Area Network LAPS Link Access Procedure SDH LCAS Link Capacity Adjustment Scheme LLC Logical Link Control MAC Media Access Control M_SDU MAC Service
41、Data Unit 4 ITU-T Rec. G.8012/Y.1308 (08/2004) MPLS Multi-Protocol Label Switching MS64 Multiplex Section level 64 NNI Network Node Interface NT Network Termination ODU Optical Channel Data Unit ODUj Optical Channel Data Unit order j ODUj-Xv Virtual concatenated Optical Channel Data Unit order j ODU
42、k Optical Channel Data Unit order k ODUk-Xv Virtual concatenated Optical Channel Data Unit order k OTH Optical Transport Hierarchy P11s 1544 kbit/s PDH path layer with synchronous 125 s frame structure according to ITU-T Rec. G.704 P12s 2048 kbit/s PDH path layer with synchronous 125 s frame structu
43、re according to ITU-T Rec. G.704 P31s 34 368 kbit/s PDH path layer with synchronous 125 s frame structure according to ITU-T Rec. G.832 P4s 139 264 kbit/s PDH path layer with synchronous 125 s frame structure according to ITU-T Rec. G.832 PA (Ethernet) Preamble PDH Plesiochronous Digital Hierarchy P
44、HY Physical PMA Physical Medium Attachment sublayer PMD Physical Medium Dependent sublayer RFC Request for Comments RPR Resilient Packet Ring RS64 Regenerator Section level 64 S-Tag Service Provider Tag S-VID Service Provider VID SA Source Address SDH Synchronous Digital Hierarchy SFD Start of Frame
45、 Delimiter SNAP Sub-Network Access Protocol STM-N Synchronous Transport Module level N TCI Tag Control Information UNI User Network Interface VC Virtual Channel (ATM) VC Virtual Container (SDH) VC-m Lower Order VC order m ITU-T Rec. G.8012/Y.1308 (08/2004) 5 VC-n Higher Order VC order n VC-n-Xc Cont
46、iguous concatenated VC order n VC-n-Xv Virtual concatenated VC order n VID VLAN Identifier VLAN Virtual LAN VLAN ID VLAN Identifier 5 Conventions None. 6 Ethernet transport network interface structure The Ethernet transport network as specified in ITU-T Rec. G.8010/Y.1306 implies two interface class
47、es: Ethernet interface as specified in IEEE 802.3 series; Ethernet-over-Transport (EoT) interface as specified in this Recommendation. The Ethernet interface can be deployed as an Ethernet User-to-Network Interface (Ety-UNI) at the edge of the transport network and as an Ethernet Network Node Interf
48、ace (Ety-NNI) within the transport network. The Ethernet NNI may be deployed as an Intra-Domain Interface (IaDI) within a single administrative domain and as an Inter-Domain Interface (IrDI) between two administrative domains. The Ethernet-over-Transport (EoT) interface can be deployed as an Etherne
49、t IaDI and IrDI NNI within the transport network. NOTE The deployment of EoT interface as an Ethernet UNI is for further study. The Ethernet UNI could be used for the provision of Ethernet services as described in ITU-T Rec. G.8011/Y.1307. Two or more Ety-UNIs are used for such a service as illustrated in Figure 6-1. Figure 6-1/G.8012/Y.1308 Locations of Ethernet Ety-UNI and NNI 6 ITU-T Rec. G.8012/Y.1308 (08/2004) The Ethernet UNI and NNI encom
