Supplement 68 to ITU-T G-series Recommendations (12/2023) Synchronization operations, administration and maintenance requirements
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Supplement
4 Abbreviations and acronyms
5 Conventions
6 Synchronization OAM functional diagram
     6.1 Frequency synchronization OAM
     6.2 Time synchronization OAM
     6.3 Frequency sync OAM and time sync OAM interactive mechanism
7 Frequency synchronization over the physical layer
     7.1 Fault management
          7.1.1 Frequency reference source loss
          7.1.2 Clock unlock
          7.1.3 Clock hardware failure
          7.1.4 Frequency reference source SSM quality level degradation
          7.1.5 SSM message loss measurement
     7.2 Performance monitoring
          7.2.1 Frequency offset monitoring of selected reference source
          7.2.2 Frequency offset monitoring of reference sources in the priority list
          7.2.3 Clock pull-in, hold-in range notice
          7.2.4 Clock power-cycle notice
     7.3 Alarms and events
8 Frequency synchronization via packets
     8.1 Fault management
          8.1.1 Frequency reference source loss
          8.1.2 Frequency reference source clockClass quality level degradation
          8.1.3 Announce message loss measurement
          8.1.4 Sync message loss measurement
          8.1.5 PTP packet timing signal unusable
     8.2 Performance monitoring
          8.2.1 Frequency offset monitoring of current reference source
          8.2.2 Frequency offset monitoring of reference sources in the priority list
          8.2.3 Frequency offset monitoring by satellite CV
     8.3 Alarms and events
9 Time synchronization
     9.1 Fault management
          9.1.1 Announce message loss measurement
          9.1.2 Sync or Delay_Resp message loss
          9.1.3 PTP degradation
          9.1.4 1PPS+ToD input loss
          9.1.5 1PPS+ToD degradation
          9.1.6 Time unlock
     9.2 Performance monitoring
          9.2.1 PTP time offset monitoring
          9.2.2 PTP delay monitoring
          9.2.3 PTP time offset accumulation monitoring
          9.2.4 Time error measurement by reference comparison
          9.2.5 Time error measurement based on passive port (e.g., in ring topology)
          9.2.6 Time error monitoring by Satellite CV
          9.2.7 Asymmetric measurement by line-swapping
     9.3 Alarms and events
Appendix I  Oscillator and frequency monitoring within a multi-card chassis system