PTP Slave with Failover between GPS, PTP and Local Oscillator

Time-Stamping and Time Synchronization

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IntelĀ® PAC
Napatech SmartNIC
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User Guide

Illustration

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 and NT200A01 SmartNICs the RJ45 and SMA ports on the external time synchronization connector are replaced by separate RJ45 and SMA time synchronization connectors.
Configuration where the primary reference is GPS via a time server and the secondary reference is a PTP grandmaster

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).

TimeSyncConnectorExt1 = PpsIn
TimeSyncReferencePriority = Ext1, PTP, FreeRun