PTP · Precision Time Protocol
IEEE-1588 time distribution using hardware timestamping in NIC and switch silicon; treat its offset bound under saturated load as a measured acceptance gate, not a configuration step.
Current numbers
ptp4l / phc2sys / ts2phcLinux PTP daemons: ptp4l distributes IEEE-1588, phc2sys slaves the system clock to the PHC, ts2phc steers the PHC from GNSS/PPS
sub-µsFleet PTP offset-from-master target the time-sync gate must demonstrate, under load and across every node
sub-microsecondMeta PTP, hardware timestamps: ~436 ns uncertainty window at 99.9999% confidence (2022); SPTP (2024) was comparable with less appliance load