[ntp:questions] IEEE 1588 (PTP) at the nanosecond level?
martin.burnicki at meinberg.de
Tue Mar 18 09:26:31 UTC 2014
Joe Gwinn wrote:
> I've used IRIG-B004 DCLS before, for cables two meters long within a
> cabinet. Worked well. How well do they handle 100 meter cables, in
> areas where the concept of "ground" can be elusive?
You could use fiber optics to transfer an IRIG DCLS signal.
However, if you want highest accuracy you need to take care how much
delay is inserted by the transceivers, and the length of the connection.
PTP has the advantage that constant delays can be measured and
In any case it's a good thing if you can measure the accuracy, e.g.
compare a 1 PPS slope generated by a time client to a 1 PPS slope
generated by the device providing the time.
This helps to find out if the time transfer suffers from uncompensated
delays (IRIG) or asymmetries (PTP).
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