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Circuit Emulation Service Definitions, Framework and Requirements

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Service Definition and Requirements for CES in Metro Ethernet Networks.Table 7 CES Services and supporting Synchronization Administration Models 29

    Technical Specification

    MEF 3

    Circuit Emulation Service Definitions, Framework and Requirements in Metro Ethernet Networks

     April 13, 2004

    ? The Metro Ethernet Forum 2004. Any reproduction of this document, or any portion thereof, Page 1 of 65 MEF 3 shall contain the following statement: "Reproduced with permission of the Metro Ethernet Forum." No user of this document is authorized to modify any of the information contained herein.

    Circuit Emulation Service Definitions, Framework and

    Requirements in Metro Ethernet Networks

    Disclaimer

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    ? The Metro Ethernet Forum 2004. Any reproduction of this document, or any portion thereof, Page 2 of 65 MEF 3 shall contain the following statement: "Reproduced with permission of the Metro Ethernet Forum." No user of this document is authorized to modify any of the information contained herein.

    Circuit Emulation Service Definitions, Framework and

    Requirements in Metro Ethernet Networks

    Table of Contents

    1. ABSTRACT .................................................................................................................................................. 8

    2. TERMINOLOGY ......................................................................................................................................... 8

    3. SCOPE ........................................................................................................................................................ 10

    4. COMPLIANCE LEVELS .......................................................................................................................... 10

    5. MEF DOCUMENT ROADMAP ................................................................................................................ 10

    6. CIRCUIT EMULATION SERVICE DEFINITION .................................................................................. 11

    6.1 TDM LINE SERVICE (T-LINE)................................................................................................................. 11

    6.1.1 Operational Modes of a T-Line Service .......................................................................................... 12

    6.1.1.1 Unstructured Emulation mode .................................................................................................... 12

    6.1.1.2 Structured Emulation mode ........................................................................................................ 13

    6.1.1.3 Multiplexing mode..................................................................................................................... 13

    6.1.2 Bandwidth Provisioning for a T-Line Service ................................................................................. 14

    6.1.2.1 Bandwidth allocation at 100 kbit/s granularity ............................................................................ 14

    6.1.2.2 TDM multiplexing ..................................................................................................................... 14

    6.1.2.3 Ethernet multiplexing................................................................................................................. 15

    6.2 TDM ACCESS LINE SERVICE (TALS) ..................................................................................................... 15

    6.2.1 Operational Modes of a TALS Service ............................................................................................ 16

    6.3 CUSTOMER OPERATED CES ................................................................................................................... 17

    6.4 MIXED-MODE CES OPERATION ............................................................................................................. 18

    7. CIRCUIT EMULATION SERVICE FRAMEWORK .............................................................................. 19

    7.1 GENERAL PRINCIPLES ............................................................................................................................ 19

    7.1.1 Use of External Standards ............................................................................................................. 19

    7.2 SERVICE INTERFACE TYPES .................................................................................................................... 19

    7.2.1 Examples of TDM Service Interfaces .............................................................................................. 20

    7.2.2 TDM Service Processor (TSP) ....................................................................................................... 20

    7.2.3 Circuit Emulation Inter-working Function (CES IWF) .................................................................... 21

    7.2.3.1 PDH Circuit Emulation Service .................................................................................................. 22

    7.2.3.2 SONET/SDH Circuit Emulation Service .................................................................................... 22

    7.2.4 Emulated Circuit De/Multiplexing Function (ECDX) ...................................................................... 23

    7.2.5 Ethernet Flow Termination Function (EFT) ................................................................................... 23

    7.2.6 Direction terminology .................................................................................................................... 23

    7.3 SYNCHRONIZATION ................................................................................................................................ 23

    7.3.1 CES Interworking Function- Synchronization Description .............................................................. 25

    7.3.2 Synchronous IWF and Associated Tributaries ................................................................................ 27

    7.3.2.1 Synchronous IWF and Tributaries .............................................................................................. 27

    7.3.2.2 Synchronous IWF and Asynchronous Tributaries ....................................................................... 27

    7.3.3 Asynchronous IWF and Associated Tributaries .............................................................................. 27

    7.3.3.1 Asynchronous IWF, Asynchronous Tributaries ........................................................................... 28

    7.3.3.2 Asynchronous IWF, Synchronous Tributaries ............................................................................. 28

    ? The Metro Ethernet Forum 2004. Any reproduction of this document, or any portion thereof, Page 3 of 65 MEF 3 shall contain the following statement: "Reproduced with permission of the Metro Ethernet Forum." No user of this document is authorized to modify any of the information contained herein.