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Spirent TestCenter: how does High Resolution Sampling Graph/Chart and Real-time Graph/Chart obtain their timestamps?

Answer

High resolution chart is not same as Real-time chart. Time stamps in real-time chart are added when update received by GUI from firmware.

High resolution chart time stamps are received from firmware and it is chassis up time tick. Main use case is to co-relate the stats in chart with other high resolution charts. 
 
This is expected as per current design.

Product : Spirent TestCenter,PGA