1606 Definition and use of timeTraceable amd currentUtcOffsetValid
Created: 30 Dec 2017
Status: Future Improvement
Part: Part 9-3 (Precision Time Protocol Profile)
Category: Issue for edition 2 of this part
The definition of timeTraceable has been changed in IEEE 1588:201x to remove the dependency on timePropertiesDS.currentUtcOffset that is duplicated by the timePropertiesDS.UtcOffsetValid flag. This separates the TAI time scale validity from the UTC time scale validity. The timePropertiesDS.timeTraceable object is copied to the timeTraceable flag in the flagField of Announce messages. It indicates that the time scale in effect is PTP.
The object timePropertiesDS.timeTraceable shall be initially FALSE when the device is powered up. It shall be TRUE after the clock has been synchronized within its nominal accuracy to a time source traceable to a primary reference time source. Is shall be FALSE if the clock is unable to estimate its time error from PTP time or is synchronized to an upstream clock that has the timeTraceable flag cleared.
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