kvdh wrote: > > RE: ntp serving. How exactly does the server sync to information > provided by a GPS receiver? Does it simply read the RMC string or > equivalent on a serial port
You generally need either the NMEA string or some other source of time to differentiate between seconds. You can use just NMEA, but, with most receivers, that has a lot of jitter, and you will have to configure a large correction for systematic error. > or does it also use the PPS as in interrupt and if the later is > necessary, is that received via an SBC's parallel port bit. Does Generally PPS is read using a modem control line on the serial port. Note that ntpd then phase locks the software clock to this information, so individual measurements will, typically, have a larger error than the time on the software clock (except for systematic errors). > the server then make time information available on request? Yes. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
