Can ptp4l be used without phc2sys on a PTP slave to produce a 1PPS signal that's synchronized to the master's 1PPS? If my understanding is correct, I would expect that running just ptp4l would be sufficient to sync 1PPS signals, however, when I tried it, the 1PPS signals were not synchronized. I thought that phc2sys is only needed to synchronize the system clock to PHC and that phc2sys should not be needed to synchronize 1PPS, but that's not what I am observing. Is my understanding wrong? When I run both ptp4l and phc2sys on the slave, the 1PPS signal is synchronized, but there is a 2-3 usec delay between master and slave 1PPS signal when I observe both on a scope. Why is that delay there and is there any way to make it much smaller? I need them to be within 20-30 nsec of each other.
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