PTP is more accurate than NTP, but not as accurate as a 1PPS line. However, PTP has the advantage that is bidirectional so it can solve the (non-trival) proble

PTP is more accurate than NTP, but not as accurate as a 1PPS line. However, PTP has the advantage that is bidirectional so it can solve the (non-trival) problem of correcting for propagation delays.