Issues #6990
sSvp9 step 4 PTP class not 6/7 with/without holdover time?
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
Updated by IEC 61850 TPWG 3 months ago
- Due date set to 10/29/2024
- Assignee set to Richard Schimmel
Needs further review. TVTR/TCTR.HoldTmms applies when PTP messages are not available.
Updated by IEC 61850 TPWG about 2 months ago
- Due date changed from 10/29/2024 to 11/12/2024
SEL to provide input. Thierry believes that the MU holdover is not of relevance as clock master is where the signal is lost.
Updated by IEC 61850 TPWG about 1 month ago
- Due date changed from 11/12/2024 to 12/10/2024
Tissues needed against 9-3, 61869-9
For the moment, PIXIT to describe the conditions to cause device to change smpSync
Updated by IEC 61850 TPWG 12 days ago
- Status changed from In Progress to Resolved
When clock class = 187 MU shall set smpSync = 1 (value 52 to be deprecated). No holdover applies as clock signal is being received.
Ed2 of 61869-9 will clarify much of this. In the interim, this is the expected behavior.