Title: Timing characteristics of enhanced primary reference time clocks
Summary
Enhanced Primary Reference Time Clock equipment specification
Provides an accurate time reference into the network, using a 1pps output port
Typical implementation based on GNSS
Jitter/wander based on Enhanced PRC specification (G.811.1)
Status
- Current version: 1st. Edition, November 2016, plus Amendment 1, August 2017
- Download from: http://www.itu.int/ITU-T/recommendations/rec.aspx?rec=13162
- Enhancements in progress: addition of a PTP time output port
Key Contents
Time Accuracy
- While locked to GNSS, with clear sky view: within 30ns of UTC (or applicable primary time standard)
- In holdover: within 100ns of UTC (or applicable primary time standard) for up to 14 days
Functional Model
Wander
Holdover
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