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Support #549

Updated by Vladan Cvejic about 3 years ago

IEC/IEEE 61850-7-2 should clarify the relation between the PTP clock clockQuality signals and the 
 timeQuality in TimeStamp. 

 
 E.g.    “Clock Not Synchronized” refers to the slave clock, not to the grandmaster. The fact that the PTP grandmaster loses its GPS reference signal is not an indication that the IED clock is not synchronized, since the grandmaster could have an excellent stability. The total loss of PTP Sync messages during xx seconds should raise the “Clock Not synchronized” flag, depending on the slave clock’s quality.  
 This is best placed in IEC/IEEE 61850-9-3, but 7-2 should make a reference to it.

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