> If you look at the white rabbit FPGA PTP updates, its in the ns range
As I recall, I had even better performance than that. Around the tens of picoseconds. But I guess the advertised 1 ns is a conservative estimate. The precison is incredible but its not magic, they squeeze the maximum amount of determinism out of custom hardware and fiber optic links. It is a bit of pain too set up, as you need to calibrate each link individually every time you change the fiber or the SFP.
As I recall, I had even better performance than that. Around the tens of picoseconds. But I guess the advertised 1 ns is a conservative estimate. The precison is incredible but its not magic, they squeeze the maximum amount of determinism out of custom hardware and fiber optic links. It is a bit of pain too set up, as you need to calibrate each link individually every time you change the fiber or the SFP.