Of *course* you can sync to better than a millisecond on the LAN. There's
not a machine worldwide at my employer more than 600 micros off from each
other, and the machines at my house are within 50.
You wanna start talking the sync-e+1588 test I'm doing? We're speaking in
nanos then.
My LTE Lite is the only USB pps I have presently - and it pulls my time
well over 200 milliseconds off reference. That's a massive change from the
1 or less I am from the internet and the 50 micros from the other boxes.
NS
=============================================
Neil,
Have you compared the PPS direct output of the LTE Lite for offset from true
UTC?
On serial-over-USB: my own tests with a different box, using PPS on the
serial port DCD line over USB were much better than that, reducing jitter
from 110-140 microseconds with a LAN connection to a stratum-1 source to 45
microseconds with a PPS/DCD over USB connection.
http://www.satsignal.eu/ntp/NTP-on-Windows-serial-port.html#usb
I may have been lucky with the particular serial-USB converter, though.
Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
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