Heiko Gerstung wrote:
Richard B. Gilbert schrieb:
I was referring to sub-microsecond accuracy over the network, it seems
that the OP has no chance to use a hardware ref clock.
My only knowledge of PTP is based on some earlier messages here but I
believe that it must have the same problems as NTP over the internet.
PTP uses hardware timestamping at the MII/PHY level, this will not help
when you use the Internet, but maybe the OP has his own nice WAN with
low-jitter connections available. You can get in the lower nanoseconds
with PTP over Ethernet, but only in very small networks or by using
PTP-aware infrastructure components like switches with integrated
hardware timestamping..
I do have access to a very nice WAN with extremely low-jitter connections. I can
likely remove nearly all buffered devices from the path - and get nearly the
equivalent of a really long cross-over cable.
<commercial for $1000+ product snipped>
The mentioned LANTIME/NDT is basically an oscillator that is disciplined
by NTP. And yes, its too expensive for using it at home :-)
Right - eventually it all comes down to price. How much accuracy can you
afford... But, this at least sounds interesting.
Thanks for the pointers.
jeff
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