> > So this is a function of the track length between the MAC and the PHY? > > Nope. > This latency represents the time it takes for the frame to travel from RJ45 > module to the timestamping unit inside the PHY. To be more precisely, > the timestamping unit will do the timestamp when it detects the end of > the start of the frame. So it represents the time from when the frame > reaches the RJ45 to when the end of start of the frame reaches the > timestamping unit inside the PHY. I must be missing something here. How do you measure the latency difference for a 1 meter cable vs a 100m cable? Does 100m cable plus 1cm of track from the RJ45 to the PHY make a difference compared to 100m cable plus 1.5cm of track? Isn't this error all just in the noise? Andrew
