Title: Timing and synchronization aspects in packet networks

On this page:

Summary

• Defines network limits on SyncE and CES for both jitter and wander

• Describes a modified synchronization chain to accommodate SyncE and packet-based timing

• Describes general issues with packet-based synchronization

• Defines test scenarios for packet-based timing systems (Appendix VI tests)

Status

• Current version: 3^rd. Edition, August 2013, plus Amendment 1, January 2015, and Corrigendum 1, April 2016
• Download from: http://www.itu.int/ITU-T/recommendations/rec.aspx?rec=12015
• Enhancements in progress: definition of network limits for chains of enhanced SyncE clocks

Key Contents

Modified Synchronization Reference Chain:

• SyncE clocks (EECs) have identical performance to SECs, and can be used interchangeably
• Packet timing protocols (e.g. NTP or PTP) may replace a segment of the chain (typically the last)

SyncE Network Limits:

Performance Tests For Packet Timing: