A unique value which identify a particular log entry. The index value cannot exced logCapacity and then returns to zero when the number of events exceds the capacity of equipement log table. Its value is : logIndex = <total number of event>%logCapacity. It is mandatory for the equipment to respond to get-next in anti-chronological order (youngest first) no matter to the index value. Get-next(LogEntry.logEntry) is logEntry.logIndex[logLastEvent]