ITU-T G.8272 (PRTC) One-Page Summary
Title: Timing characteristics of Primary Reference Time Clocks
Summary
Primary Reference Time Clock equipment specification
Provides an accurate time reference into the network, using either 1pps or PTP output
Typical implementation based on GNSS
Jitter/wander based on PRC specification (G.811)
Describes test strategies for evaluating the performance of PRTC implementations
Status
Current version: 4th Edition, July 2025
Download from: http://www.itu.int/ITU-T/recommendations/rec.aspx?rec=13769
Key Contents
Time Accuracy (clear sky)
Class A PRTC: within 100ns of UTC
Class B PRTC: within 40ns of UTC
Wander:
Functional Model:
Test Strategies:
On this page: