Pulse per second (PPS) is a generic name for testing synchronization status (accuracy and stability).
Before using PPS signals to synchronize the PHC, NVIDIA advises to manually experiment with the PPS card interfaces to confirm that they are working correctly.
Warning
Regarding "/dev/ptpX", you must check what your PTP Hardware Clock is and replace the number with the right one.
To find that information, run the following command:
“ptp_dev=`ethtool -T <netdev> | awk '/PTP Hardware Clock:/ {print $4}'` && "/dev/ptp$ptp_dev"”
Replacing <netdev> with the Linux interface name