Table of Contents - G.781 (2024) Amd. 1 (08/2024) -
1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Synchronization principles
5.1 Network synchronization
5.2 Synchronization distribution trails
5.3 Synchronization interfaces
5.4 Clock-source quality-level
5.5 Synchronization status messages (SSMs), extended QL TLV, and timing marker (TM) channels
5.6 Selection process
5.7 Signal fail
5.8 Hold-off time
5.9 Wait-to-restore time
5.10 Synchronization source priorities
5.11 External commands
5.12 Automatic reference selection process
5.13 Timing loop prevention
5.14 Delay times for NEs with SEC/ST3/SIC
5.15 Delay times for NEs with SSU/ST2 or for SASE/BITS
5.16 Synchronization layer functions
5.17 Overview of the processes performed within the atomic functions
5.18 Interworking between option�I, II and III synchronization networks
6 Synchronization distribution layer atomic functions
6.1 SD connection function (SD_C)
6.2 SD trail termination functions
6.3 SD adaptation functions
7 Network synchronization layer atomic functions
7.1 NS_connection functions (NS_C)
8 Transport layer to SD layer atomic functions
8.1 STMn multiplex section adaptation functions
8.2 Pqs adaptation functions
8.3 P12s layer adaptation functions
8.4 T12 layer adaptation functions
8.5 P11s layer adaptation functions
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8.6 T01 layer adaptation functions
8.7 T02 layer adaptation functions
8.8 T21 layer adaptation functions
8.9 ETH layer adaptation functions
8.10 OTUk layer adaptation functions
8.11 OSC layer adaptation functions
8.12 FlexO layer adaptation functions
8.13 FlexE layer adaptation functions
8.14 MTNS layer adaptation functions
9 Equipment clock to transport layers clock adaptation functions
9.1 STM-N layer
9.2 VC layers
9.3 Pxx layers
9.4 T12 layer
9.5 T01 layer
9.6 T02 layer
9.7 T21 layer
9.8 ETYn layer
9.9 ODU layer
9.10 OSC layer
9.11 FlexO layer
9.12 FlexE layer
9.13 MTNS layer
10 T12 section layer functions
10.1 T12 connection function T12_C
10.2 T12 trail termination functions
11 T01 section layer functions
11.1 T01 connection function T01_C
11.2 T01 trail termination functions
12 T02 section layer functions
12.1 T02 connection function T02_C
12.2 T02 trail termination functions
13 T21 section layer functions
13.1 T21 connection function T21_C
13.2 T21 trail termination functions
Annex A � Synchronization selection process
Annex B � SyncPhy data sets
B.1 Introduction of SyncPhy dataset
B.2 Derived data type specifications
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B.3 defaultDS data set member specifications
B.4 currentDS data set member specifications
B.5 parentDS data set member specifications
B.6 portDS data set member specifications
Appendix I � Transport layer models for synchronization information
Appendix II � Examples of synchronization functionality in the NE
II.1 Examples of synchronization functionality in the NE for option�I networks
II.2 Examples of synchronization functionality in the NE for option�II networks
II.3 Examples of synchronization functionality in the NE for option�III networks
Appendix III � Delay time allocation for option�I and III networks
III.1 Delay and processing times for the synchronization selection process
III.2 Nonswitching message delay TNSM
III.3 Switching message delay TSM
III.4 Holdover message delay THM
III.5 Wait-to-restore time TWTR
Appendix IV � Interworking of option�II equipment supporting second-generation SSM and first-generation SSM using a translation function
Appendix V � SDL descriptions
Appendix VI � Clarification of the use of the acronym 'SEC'
Appendix VII � Use cases of mixing SSM and eSSM
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