Recommendation ITU-T G.8264/Y.1364 Amendment 2 (01/2024) Distribution of timing information through packet networks
Summary
History
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 Packet network architectures
     6.1 Network layers and synchronization
     6.2 Layer network performance impacts on synchronization
7 Timing flows
8 Functional blocks
9 Next generation timing architectures
     9.1 Current synchronization based on SDH
     9.2 Synchronization performance
     9.3 Network evolution
     9.4 Next generation synchronization networks
          9.4.1 Synchronous Ethernet
          9.4.2 Packet timing mechanisms
10 Frequency transfer using synchronous Ethernet
     10.1 Synchronous Ethernet: General
     10.2 Operation modes
11 SSM for synchronous Ethernet
     11.1 Packet-level SSM
          11.1.1 ESMC operation with link aggregation
     11.2 Sync selection based on SSM
     11.3 SSM for synchronous Ethernet: Format and protocol
          11.3.1 ESMC format
               11.3.1.1 ESMC PDU format
               11.3.1.2 QL TLV format
               11.3.1.3 Extended QL TLV format
               11.3.1.4 Interworking between different SyncE generations
          11.3.2 Protocol behaviour
               11.3.2.1 QL generation
               11.3.2.2 QL reception
     11.4 ESMC PDU extensions
     11.5 Interworking with existing synchronization networks
     11.6 SSM for clocks with enhanced holdover
12 Use of synchronous Ethernet in a multi-operator context
     12.1 Timing transparent transport of synchronous Ethernet client signals
     12.2 Synchronization service provided by the carrier operator based on an interface providing a physical timing reference (generation of synchronous Ethernet interface)
13 Synchronization management aspects
Annex A  Reference source selection mechanism
     A.1 Requirements
     A.2 Inputs
     A.3 Internal oscillator
     A.4 Internal physical timing flows – Frequency ETY
     A.5 Selection mechanism
     A.6 Synchronization status message selection
     A.7 Hybrid equipment selection function
Appendix I  Examples of timing flows
Appendix II  Functional models based on ITU-T G.805 and ITU-T G.809
     II.1 Background
     II.2 Application of ITU-T G.805 to the IWF
     II.3 Timing information transported over layer networks
     II.4 Functional model of Ethernet physical layer timing
     II.5 Functional model for differential and adaptive methods
Bibliography