Intel network adapters such as the I340 and I350, as well as the Intel(r) Ethernet Server Adapter I210-T1 and Intel(r) Ethernet Controller I210, support IEEE 1588 Precision Time Protocol (PTP) for high-precision timing synchronization across the network.
The device drivers for these adapters do not support the 1588 protocol standard, but it is possible to use hardware timestamps for non-PTP packets.
The i210-T1 does not have a PPS pin on the physical board, but the other pins likely are LED.
Microsoft Learn provides an example of how applications can use timestamps end to end.
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Intel Communities is a forum for users to ask questions about hardware PTP timestamping on Windows 10. Intel supports IEEE 1588 PTP since Version 1909, and the "PTP Hardware Timestamp" option is not available on Windows 10 drivers. Intel also has a list of adapters that support PTP and are already implemented in the Windows driver, but the "PTP Hardware Timestamp" option is not available on Windows 10 drivers.
Hardware PTP Timestamping on Windows 10 - Intel Communities
Increasing growth in 5G and Edge deployments is driving demand for high-precision timing synchronization across the network. Most of these deployments will use 1588 Precision Time Protocol (PTP) to ensure the required synchronization levels.
Hardware-Enhanced Precision Time Protocol Support - Intel
Intel network adapters such as the I340 and I350 are capable of supporting IEEE 1588 (hardwarre time stamping) and the Intel(r) Ethernet Server Adapter I210-T1 also supports IEEE-1588. The Intel(r) Ethernet Controller I210 also supports AVB - audio video bridging, and the datasheet for the silicon on the card outlines the capabilities of the silicon. It is possible to use hardware timestamps for non-PTP packets using the given adapters, but it is not possible to do so for all Ethernet traffic.
Which Intel NICs support hardware timestamps (hardstamps) - Intel Communities
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