Hi, I have built a ntp-server based on information found here http://www.febo.com/pages/soekris/ and here http://ralphsmith.org/~ralph/soekris-ntp/NET4501.
I use this tool http://www.satsignal.eu/software/net.htm#NTPmonitor to check the result. The result is not in line with my expectations so I think something is not quite right. If I compare with a normal PC (running FreeBSD 7.1) which is synchronized against stratum 2 servers over Internet, the performance I get from net4501 is not any better than this PC. The NTPmonitor program show following result: An Internet Stratum1 server | my PC | net4501 Precision: 2^-29s 2^-19s 2^-16s Dispersion: 2ms ~30ms 0ms Both the PC and net4501 show a huge offset error of 1s about 11 times in 2 hours. The Internet Stratum1 server does not seem to have this error. My feeling is that my net4501 server does not really use the PPS signal. How do I check if the ntpd daemon actually use the PPS? Or rather, how do I know the the precision of the PPS signal is transferred into the ntpd daemon? (I can see with ntpq -p that the PPS row from the config file is selected) The description on febo.com says that the PPS signal should be supplied at R61/R62. I have made this as well as JP3, pin3. Does anyone know where R61/R62 is connected, why is this needed as well as on the GPIO pins? I just followed the instruction, but it is hard to do fault finding when not knowing the idea behind it from the beginning :-) On http://ralphsmith.org/~ralph/soekris-ntp/NET4501, there are a set of gpsd files. I could not find anything about how to start the gpsd so I have not installed it, don't know if it is needed or not? Any ideas are highly appreciated. /Göran _______________________________________________ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
