ITU-T G.8264 (ESMC) One-Page Summary

Title: Timing and synchronization aspects in packet networks

On this page:

Summary

  • Defines ESMC (Ethernet Synchronization Message Channel) to carry SSM messages

  • Defines functional models for SyncE and Circuit Emulation synchronization

Status

Key Contents

  • Definition of ESMC:
    • ESMC based on Ethernet Link OAM using the Organizational Specific Slow Protocol (OSSP)
    • Carries 4-bit SSM code defining Quality Level (QL) (codes defined in G.781)
    • “Heart-beat” frame sent once per second
    • Event frame sent on QL-change
    • Link declared down after 5s without receiving a heartbeat frame
  • Use of SyncE in a multi-operator context