Recommendation ITU-T G.800 (2016) Corrigendum 1 (02/2022) Unified functional architecture of transport networks
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms imported from ITU-T G.805
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Functional architecture of transport networks
     6.1 Topological components
          6.1.1 Layer network
          6.1.2 Subnetwork
          6.1.3 Link
          6.1.4 Access group
     6.2 Derived network constructs for topological viewpoints
          6.2.1 Transitional link
     6.3 Transport entities and their properties
          6.3.1 Forwarding
               6.3.1.1 Forwarding function
          6.3.2 Subnetwork transport entity
          6.3.3 Link connection
          6.3.4 Connection
          6.3.5 Differentiated connection
          6.3.6 Multipoint transport entities
          6.3.7 Access transport entity
          6.3.8 Trails
          6.3.9 Transitional link connection
          6.3.10 Partitioning of transport entities
          6.3.11 Reservation and allocation
     6.4 Transport information entities
     6.5 Transport processing functions
          6.5.1 Adaptation function
               6.5.1.1 Adaptation source function
               6.5.1.2 Adaptation sink function
               6.5.1.3 Adaptation and information constructs
          6.5.2 Termination function
               6.5.2.1 Termination source function
               6.5.2.2 Termination sink function
               6.5.2.3 Termination and information constructs
          6.5.3 Layer processor function
     6.6 Reference points
     6.7 Topology
          6.7.1 Partitioning of a topological component
          6.7.2 Resource considerations
          6.7.3 Assignment of topology to organizations or communications
     6.8 Layer relationships
          6.8.1 Inheritance of geographic properties
          6.8.2 Links supported by multiple server layer trails
     6.9 Transport over composite links
          6.9.1 Transport over composite link for transport resilience
          6.9.2 Faults and their supervision in a composite link
7 Transparency and impairments
     7.1 Interlayer information dependency
8 Sublayers
     8.1 Channel forwarding
          8.1.1 Insertion/removal at a forwarding point
          8.1.2 Insertion/removal at a forwarding end point
          8.1.3 Sublayer trail
     8.2 Destination forwarding
          8.2.1 Insertion/removal at a forwarding point
          8.2.2 Sublayer OAM maintenance relationship
9 Transport network availability enhancement techniques
     9.1 Differentiated connection protection
     9.2 Composite link protection
Annex A  Fundamental concepts used in this Recommendation
     A.1 Axioms of the unified architecture
     A.2 Information
     A.3 Encoding and labelling
          A.3.1 Distinguishing and identifying individual communications on shared resources
          A.3.2 Equivocation overhead
     A.4 Identity and identifiers
          A.4.1 Identifiers
Annex B  Definition and properties of a system
     B.1 Introduction
          B.1.1 Definition of a system
          B.1.2 System binding
          B.1.3 Compound system or aggregation
          B.1.4 Configuration and construction of systems
     B.2 Information systems
          B.2.1 Forms of information
          B.2.2 State synchronous and state asynchronous information systems
     B.3 Basic transfer function and a telecommunications network
          B.3.1 General
          B.3.2 Transparency and labelling
          B.3.3 Passing information to control an information system
          B.3.4 Examples of forwarding and demerging
               B.3.4.1 Forwarding
               B.3.4.2 Demerging
               B.3.4.3 Connection-oriented and connectionless examples
Annex C  Communication
     C.1 Service configuration
     C.2 Forwarding modes of a transport entity
     C.3 Monitoring of a transport entity
Annex D  Transport entity roles
     D.1 Overview of transport entity roles
     D.2 Roles of the transport entity within an operational domain
          D.2.1 Role of the virtual channel
          D.2.2 Role of the virtual path
          D.2.3 Role of the virtual section
     D.3 Roles of the transport entity across multiple operational domains
Appendix I  Use of identifiers
     I.1 Use of identifiers
Appendix II  Relationships between architectural entities
Appendix III  Complexity and scalability of systems
     III.1 Independence of subsystems
     III.2 Independence within a lifecycle and between lifecycles
     III.3 Transparency of telecommunications network services
Appendix IV  Access points in architecture and equipment Recommendations
Appendix V  Examples of roles of the transport entity
     V.1 Examples of roles of the transport entity within an operational domain
          V.1.1 Switched-service instance (virtual channel)
          V.1.2 Service aggregation using a single switched transport entity (virtual path)
     V.2 Roles of transport entities that span multiple operational domains
          V.2.1 Transport entity roles in two operational domains
          V.2.2 Transport entity roles between three operational domains (remote network interface)
Bibliography
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