The figure shows a configuration where the primary reference is GPS via a time server and the secondary reference is a PTP grandmaster. If all external references fail, the time stamp clock fails over to the local oscillator (FreeRun).
Note: On NT200A02, NT200A01 and NT100A01 SmartNICs the RJ45 and SMA ports on the external time synchronization connector are replaced by separate RJ45 and SMA time synchronization connectors.
These ntservice.ini code lines configure the NT SmartNIC (Napatech SmartNIC PTP Slave) for the setup in Illustration and to permanently run in PTP slave-only mode (clock class 255).
TimeSyncConnectorExt1 = PpsIn TimeSyncReferencePriority = Ext1, PTP, FreeRun