On 2007-05-09, Christian Pinedo Zamalloa <[EMAIL PROTECTED]> wrote: > hi all, > > I'm a newbiew on NTP services, but anyway I'm trying to setup a Stratum1 > server with the following hardware and software: > > - GPS Motorola Oncore M12 > - Server: > - CentOS 3.8 > - Linux kernel 2.4.33.3 > - ntp 4.2.2p4 > - PPSKit 2.1.7 >
After reading emails of the mailing list and searching the web i decided to migrate the ntp server to FreeBSD 6.1. I enabled PPS_SYNC in the kernel, compiled the kernel and the world, and configured again the ntp daemon. The result is ok, the server is running better and it has been announced as a stratum one public server in ntp.isc.org wiki. Anyway, i would like to ask to the users of a Motorola M12 receiver what should be the accuracy of the time server. Reading the logs and using ntpq tool i see that is from several useg to hundred useg. I though that it could reach nanoseg. Was I wrong? $ ntpdc -c kern pll offset: -0.000101122 s pll frequency: -21.032 ppm maximum error: 0.007368 s estimated error: 3e-06 s status: 2307 pll ppsfreq ppstime ppssignal ppsjitter nano pll time constant: 4 precision: 1e-09 s frequency tolerance: 496 ppm pps frequency: -21.032 ppm pps stability: 0.645 ppm pps jitter: 1.797e-06 s calibration interval: 256 s calibration cycles: 420 jitter exceeded: 3717 stability exceeded: 0 calibration errors: 27 Best regards, -- Christian Pinedo Zamalloa _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
