Recommendation ITU-T G.781.1 (02/2022) Synchronization layer functions for packet-based synchronization
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-based synchronization functional model and general principles
     6.1 Packet-based synchronization functional model
     6.2 Synchronization interfaces
     6.3 Automatic reference selection process (alternate BMCA)
     6.4 PTP Announce message delay times for NEs
     6.5 Overview of the processes performed within the atomic functions
7 Network synchronization layer atomic functions
     7.1 NS-p connection function (NS-p_C)
8 Synchronization distribution layer atomic functions
     8.1 SD-p connection function (SD-p_C)
          8.1.1 SD-p connection source function (SD-p_C_So)
          8.1.2 SD-p connection sink function (SD-p_C_Sk)
     8.2 Trail termination (TT) functions
          8.2.1 SD-p trail termination functions (SD-p_TT_So and SD-p_TT_Sk)
               8.2.1.1 SD-p trail termination source function (SD-p_TT_So)
               8.2.1.2 SD-p trail termination sink function (SD-p_TT_Sk)
          8.2.2 SD-t trail termination functions (SD-t_TT_So and SD-t_TT_Sk)
               8.2.2.1 SD-t trail termination source function (SD-t_TT_So)
                    8.2.2.1.1 SD-t trail termination source function of PRTC
                    8.2.2.1.2 SD-t trail termination source function of PTP slave clock
               8.2.2.2 SD-t trail termination sink function (SD-t_TT_Sk)
                    8.2.2.2.1 SD-t trail termination sink function of T-GM
                    8.2.2.2.2 SD-t trail termination sink function of an application device
     8.3 Adaptation functions
          8.3.1 SD-p layer to NS-p layer adaptation functions (SD-p/NS-p_A_So and SD-p/NS-p_A_Sk)
               8.3.1.1 SD-p layer to NS-p layer adaptation source function (SD-p/NS-p_A_So)
               8.3.1.2 SD-p layer to NS-p layer adaptation sink function (SD-p/NS-p_A_Sk)
          8.3.2 SD-t layer to NS-p layer adaptation functions (SD-t/NS-p_A_So and SD-t/NS-p_A_Sk)
               8.3.2.1 SD-t layer to NS-p layer adaptation source function (SD-t/NS-p_A_So)
               8.3.2.2 SD-t Layer to NS-p layer adaptation sink function (SD-t/NS-p_A_Sk)
          8.3.3 SD-t layer to TRef adaptation source function (SD-t/TRef_A_So)
          8.3.4 SD-t layer to application clock (AppCk) adaptation sink function (SD-t/AppCk_A_Sk)
9 Transport layer to SD-p layer atomic functions
     9.1 ETH to SD-p adaptation functions
          9.1.1 ETH to SD-p adaptation source function (ETH/SD-p_A_So)
          9.1.2 ETH to SD-p adaptation sink function (ETH/SD-p_A_Sk)
     9.2 OTUk to SD-p adaptation functions
          9.2.1 OTUk to SD-p adaptation source function (OTUk/SD-p_A_So)
          9.2.2 OTUk to SD-p adaptation sink function (OTUk/SD-p_A_Sk)
     9.3 OTSn to SD packet-based sync adaptation functions
          9.3.1 OTSn to SD packet-based sync adaptation functions (OTSn/SD-p_A_So)
          9.3.2 OTSn to SD packet-based sync adaptation functions (OTSn/SD-p_A_Sk)
     9.4 FlexE to SD time sync adaptation functions (FlexE/SD-t_A_So and FlexE/SD-t_A_Sk)
Appendix I  Transport layer models for packet-based synchronization information
Appendix II  Examples of packet-based synchronization functionality in the NE
Appendix III  Analysis of message delay times for NEs in packet-based  synchronization networks
     III.1 Introduction
     III.2 Non-switching PTP message delay TPNSM
     III.3 Switching PTP message delay TPSM
     III.4 PTP Holdover message delay TPHM
Bibliography
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