"JuanFran" <[email protected]> wrote in message news:6a4e421a-318b-4fa1-9105-6ef77a861...@p19g2000vbq.googlegroups.com... [] > Hi! My system should be accurate to within approximately 10 > milliseconds .I think forcing upgrade all computers in my LAN at the > beginning should be enough. Thank you very much for the anwser!
Be aware that the timing resolution on Windows is in the order of 10 milliseconds, so you are asking a lot. Having a local stratum-1 server (GPS-driven), and using a LAN polling interval of 64 seconds (or even 16 seconds - maxpoll 4), this should /just/ be possible with Windows XP in a reasonably temperature controlled environment, and with no highly variable CPU loads or other factors which induce timing changes. A better way which two of us have suggested might be to distribute an RS-232-level NMEA and PPS signal to /all/ the PCs (hope they have serial ports!) and run them /all/ as stratum-1 NTP devices. Be aware that PC clocks can easily have an error of 100 parts per million (ppm) - that's about 8 seconds per day, so a 10 millisecond error could build up in about a minute and a half. Syncing once at the beginning is not enough. NTP allows for PC clock errors five times that - up to 500 ppm. Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
