Issues #6990
sSvp9 step 4 PTP class not 6/7 with/without holdover time?
Status:
New
Priority:
Normal
Assignee:
-
Due date:
Discuss in Upcoming Meeting:
No
Clause Reference:
61850 Standard:
9-2
Triggering Tissue:
Final Decision:
Initial Test Document:
Updated Test Document:
Test Case ID:
sSvp14
Closed Reason:
--Not Set---
Triggering Tissue 2:
Triggering Tissue 3:
Description
IEEE 1588 defines clock class 6-7-52-187. When the master clock looses the GPS signal the master will continue. After a while the master clock will have clock class 7 and then 52 and then 187. When should the MU set the SmpSynch=1? Should it do immediately after clock 52 is received? May/Shall it wait it's own holdover time?
IEC 61869-9 is not that clear on this.
Proposal to add the holdover time:
4. Force the global PTP master to local (clockClass not 6 and not 7) by for example disconnecting the GPS antenna, then wait the holdover time (TVTR/TCTR.HoldTmms) plus 30 seconds
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