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1、1Introducing the Specifications of the Metro Ethernet Forum* MEF 10 * replaced MEF 1 and MEF 5MEF 2 Requirements and Framework for Ethernet Service Protection MEF 3Circuit Emulation Service Definitions, Framework and Requirements in Metro Ethernet Networks MEF 4 Metro Ethernet Network Architecture F
2、ramework Part 1: Generic Framework MEF 6Metro Ethernet Services Definitions Phase I MEF 7 EMS-NMS Information Model MEF 8Implementation Agreement for the Emulation of PDH Circuits over Metro Ethernet NetworksMEF 9 Abstract Test Suite for Ethernet Services at the UNI MEF 10 Ethernet Services Attribut
3、es Phase I MEF 11 User Network Interface (UNI) Requirements and Framework MEF 12Metro Ethernet Network Architecture Framework Part 2: Ethernet Services Layer MEF 13 User Network Interface (UNI) Type 1 Implementation Agreement MEF 14 Abstract Test Suite for Ethernet Services at the UNI MEF 15Requirem
4、ents for Management of Metro Ethernet Phase 1 Network Elements MEF 16 Ethernet Local Management Interface2This Presentation Purpose This presentation is intended as an introduction and companion to both the MEF 3 and MEF 8 Specifications These are the two principal specifications relating to service
5、s that carry Circuit Emulation/TM traffic across Carrier Ethernet Audience It is intended for Product Marketing, Engineering staff of member companies, for members of other standards bodies, Enterprise networking staff, and service providers who Would like a quick overview of the specifications Plan
6、 to read the specifications in detail Other Documents Presentations of the other specifications and an overview of all specifications is available on the MEF web site Other materials such as white papers and case studies are also available3MEF Specifications OverviewAudienceEquipment Manufacturers s
7、upporting devices that provide Circuit Emulation over Carrier Ethernet Services. Useful for Service Providers architecting their systems.PurposeCircuit Emulation Service “tunnels” TDM traffic through a Metro Ethernet network allowing inclusion of legacy networks within a Carrier Ethernet environment
8、PurposeGives precise instructions for implementing interoperable CES equipment that reliably transport TDM circuits across Metro Ethernet Networks while meeting the required performance of circuit emulated TDM services as defined in ITU-T and ANSI TDM standardsCircuit Emulation Service Definitions,
9、Framework and Requirements in Metro Ethernet NetworksMEF 3Implementation Agreement for the Emulation of PDH Circuits over Metro Ethernet NetworksMEF 8Technical Committee Service AreaAudienceEquipment Manufacturers supporting devices that provide Circuit Emulation over Carrier Ethernet Services. Usef
10、ul for Service Providers architecting their systems.Technical Committee Service Area4MEF 3: CES Framework & Requirement MEF 8: CES Implementation AgreementIndustrys first formal definition of CES standards over EthernetA services description Types of TDM services offered over Metro Ethernet, PDH and
11、 SONET/SDH DS1E1, DS3/E3, OC-3/STM-1, OC-12/STM-4A requirement document Comprehensive CES requirements for providing TDM services over Ethernet SLA service quality parameters as specified by the ITU for TDM servicesAn implementation agreement for Ethernet Practical agreement as to how to implement t
12、he CES over Ethernet5TDM Circuits (e.g. T1/E1 Lines)What is Circuit Emulation Service over Carrier Ethernet? Circuit Emulation Service “tunnels” TDM traffic through a Metro Ethernet network packet network “emulates” a circuit-switched network, re- creating the TDM circuit at the far end invisible to
13、 TDM source and destination equipment runs on a standard Ethernet Line Service (E-Line)TDM PipeMetro Ethernet NetworkTDM Circuits (e.g. T1/E1 Lines)6MEF 3 TDM Circuit EmulationSupport Traditional PDH/SONET/SDH hand-offs to existing customer voice equipment Allow Interworking onto Ethernet EVCS acros
14、s the MEN. Types: 1)Unstructured - all bits in must be sent across to the destination2) Structured - Requires only sending TDM payloads not the over head7Circuit Emulation Services Relationship to the Metro Ethernet NetworkCES functions in relation to those specified by the MEF for the MEN8Functions
15、 DefinedTSP - Optional TDM mux/demux function prior to Ethernet interworking IWF - Interworking function of TDM to Ethernet frames ECDX - Identifier function for proper forwarding and demultiplexing EFTF Addressing and FCS functions.9Functions appliedECDX as shown is effectively a multiplexing funct
16、ion allowing multiple CES circuits to share a single EVCMEN10Functional Layering, and mapping onto encapsulation headers Treats the MEN as a “virtual wire” between two TDM networks11Customer PremisesCustomer PremisesMetro Ethernet NetworkMEF Service Definitions TDM Line Service (T-Line): Application: Leased line replacementCESoETHEthernet UNIEthernet UNIEthernetE-Line ServiceEthernetTDMTDMCES IWFC
