ITU-T G.7703 : 2021

Summary
History
Keywords
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Overview
6.1 Control component overview
6.2 Call and connection control
6.2.1 Call control
6.2.2 Call admission control
6.2.3 Connection control
6.2.4 Connection admission control
6.2.5 Relationship between call state and connection state
6.3 Interaction between control domains, transport resources and other MC systems
6.3.1 Other MC systems – Transport interaction
6.3.2 ASON control domain – Transport interaction
6.3.3 Other MC systems – ASON control domain interaction
6.3.4 Resource management
6.4 User architecture
7 Transport resources and their representation
7.1 Transport functional architecture
7.2 Domains
7.2.1 Relationship between control domains and control components
7.2.2 Relationship between control domains, interfaces and reference points
7.3 Control view of transport resources for connection management
7.4 Virtualization
7.5 Multilayer aspects
7.5.1 Representation as SNP link connections
7.5.2 Representation as a set of SNPP links and subnetworks
7.5.3 Multi-layer routing topology
7.6 Interlayer client support
7.6.1 NCC to NCC calls in ASON networks
7.6.2 Name space interactions
7.7 Calls supported by calls at same layer
7.8 Mapped server interlayer relationships
8 Control components
8.1 Notation
8.2 Policy and federations
8.2.1 Policy in ASON networks
8.2.2 Federation in ASON networks
8.3 Architectural components
8.3.1 Call controller components
8.3.1.1 Calling/called party call controller
8.3.1.2 Network call controller
8.3.1.3 Call controller interactions
8.3.1.4 Call modification
8.3.1.5 Call failure handling
8.3.2 Connection controller (CC) component
8.3.3 Routing controller (RC) component
8.3.4 Link resource manager (LRM)
8.3.4.1 LRMA
8.3.4.2 LRMZ
8.3.5 Discovery agent and link discovery process
8.3.6 Termination and adaptation performers (TAP)
8.3.7 Directory service (DS)
8.3.8 Notification Components
8.3.9 Protocol controller (PC) components
8.3.10 Traffic policing (TP)
9 Common control communications
9.1 Control communications network
10 Common management aspects of common control components
11 Identifiers
11.1 Resources in the transport network
11.2 Control view of transport resources
11.2.1 Name spaces for routing and connection control
11.2.2 Name space recursion
11.3 Control Components
11.4 Control artefacts
11.5 Reference points
11.5.1 UNI
11.5.2 I-NNI
11.5.3 E-NNI
12 Resilience
12.1 Principles of MC component and transport network interaction
12.2 Principles of protocol controller communication
13 Connection availability enhancement techniques
13.1 Protection
13.2 Restoration
13.2.1 Re-routing in response to failure
13.2.1.1 Intra-domain failures
13.2.1.2 Inter-domain failures
13.2.1.3 Link failure between adjacent gateway network elements
13.2.1.4 Gateway network element failure
13.3 Nested routing domains
14 Topology and discovery
14.1 SNPP links
14.2 Routing areas
14.2.1 Aggregation of links and routing areas
14.2.2 Relationship to links and link aggregation
Annex A Connection services
Appendix I Resilience relationships
I.1 ASON control domain – DCN relationships
I.1.1 UNI
I.1.1.1 Failure case
I.1.1.2 Recovery case
I.1.2 NNI
I.1.2.1 Failure case
I.1.2.2 Recovery case
I.2 ASON control domain – Transport resource relationships
I.2.1 Transport resource information – Query
I.2.2 Transport resource information – Event driven
I.2.2.1 Transport network protection
I.2.3 Transport network dependency on the ASON control domain
I.3 Control domain – MC system relationships
I.3.1 NMI
I.3.1.1 Failure case
I.3.1.2 Recovery case
I.4 Intra-control domain relationships
I.4.1 Network call controller
I.4.2 Connection controller
I.4.3 Routing controller
I.4.4 Link resource manager
I.4.5 Protocol controllers
I.4.6 Intra-control domain information consistency
Appendix II Example of layered call control
Appendix III Component interactions for connection set-up
III.1 Hierarchical routing
III.2 Source and step-by-step routing
III.2.1 Source routing
III.2.2 Step-by-step routing
III.2.3 Combination of source and step-by-step routing
III.3 Connection protection
III.4 Restoration – Hard re-routing – Intra-domain – Hierarchical method
III.5 Restoration – Soft re-routing – Intra-domain – Source method
III.6 Restoration – Revertive re-routing – Intra-domain – Source method
III.7 Source routing using a routing query interface
Appendix IV Example of explicit multi-layer routing topology

Recommendation ITU-T G.7703 describes the reference architecture and requirements for the automatically switched optical network (ASON) as applicable to connection-oriented circuit or packet transport networks.

This Recommendation specifies the architecture and requirements for the automatic switched transport network (ASON).