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
~10 nsPTP accuracy held across an NVIDIA Spectrum switch (one-step, across speeds/FEC)
~1 mstypical NTP accuracy over a LAN — 3–6 orders coarser than PTP
~10 nsPTP accuracy held across a Spectrum switch; ConnectX-class NIC timestamping under ~4 ns variance