IEEE 1588 PTP and SyncE Slave

Time-Stamping and Time Synchronization

Intel® PAC
Napatech SmartNIC
Content Type
User Guide
Capture Software Version
Link™ Capture Software 12.10


NT SmartNICs can utilize SyncE-enabled networks to provide highly stable frequency synchronization of the time stamp clock, which ensures a very good precision.
Note: SyncE slave frequency synchronization does not apply to the following SmartNICs.
  • NT200A02
  • NT100A01


The figure shows an NT SmartNIC configured in PTP and SyncE slave mode. The Napatech SmartNIC time stamp clock (TS Clk) is synchronized to the PTP grandmaster reference clock (Ref Clk). PTP provides time-of-day information and phase (the second tick), and SyncE provides highly stable frequency synchronization. SyncE can also be used without enabling PTP, and in this case only the clock frequency is synchronized to the reference.

Page-1 Sheet.1 Sheet.2 Sheet.3 Sheet.4 Sheet.5 Sheet.6 Sheet.7 Sheet.8 Napatech Accelerator Napatech SmartNIC Sheet.9 PTP Slave PTP Slave Sheet.10 Sheet.11 TS TS Sheet.12 Clk Clk Sheet.13 Sheet.14 Sheet.15 Sheet.16 Sheet.17 Sheet.18 Sheet.19 PTP Grandmaster PTP Grandmaster Sheet.20 Sheet.21 Ref Ref Sheet.22 Clk Clk Sheet.23 Sheet.24 Sheet.25 Sheet.26 Sheet.27 RJ45 RJ45 Sheet.28 Sheet.29 Sheet.30 Sheet.31 PTP PTP Sheet.32 Sheet.33 Sheet.34 Sheet.35 Sheet.36 Sheet.37 Sheet.38 PTP/ PTP/ Sheet.39 SyncE SyncE Sheet.40 Network Network Sheet.41 SyncE SyncE Sheet.42 Sheet.43 Sheet.44 TS Con TS Con Sheet.45 Sheet.46 Sheet.47

ntservice.ini configuration

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) and synchronize time stamp clock frequency to SyncE.

TimeSyncReferencePriority = PTP, FreeRun
TimeSyncFrequencyReferencePriority = SyncE, FreeRun