"David J Taylor" <david-tay...@blueyonder.neither-this-part.nor-this-bit.co.uk> writes:
>David L. Mills wrote: >> David, >> >> In the NTPv3 spec the leap bits are to be set on the day of the leap. >> This is compliant with the new NTPv4 spec; that spec is more liberal >> in order to support and prioritize leap warnings when multiple means >> are available. In cases where the radio delivers a timecode via >> serial port, some radios include provisions for leap warning; some do >> not. I don't know if an NMEA sentence has provisions for that. There >> are no provisions for leap warning in IRIG devices I have. >> >> I don't know if the Meinberg GPS or EndRun CDMA receiver include >> provisions for leap warning. If so, it should appear in the NTP header >> on the day of the leap. Both receivers use an embedded Linux system >> which in principle has the same provisions as the public >> distribution.. >> >> Dave >Thanks, Dave. I don't know about the NMEA sentence either, but I don't >recall seeing that possibility. On my GPS-based server, it does also have >Internet sources, but even though one of those sources is showing the leap >bit, my server is not. I'll have to check on December 31st. It will be >disappinting if I have similar problems to last time! > http://www.satsignal.eu/ntp/ntp-events.htm#leapsecond >In view of the popularity of the GPS18-LVC it's a pity that the driver >support for the leap second isn't better, but I appreciate that being able >to test once every few years doesn't make things any easier! As far as I can see, the GPS18-LVC unit does NOT warn of leapseconds. There is absolutely nothing the driver can do if the information is not supplied by the GPS unit. >Here are the results from my own server, and two of the five Internet >servers to which it is connected. Disappointingly, the three pool servers >didn't respond to the "ntpq -c rv" command. Of the other two, one >indicates a leap second, and the other doesn't. >__________________________________________________________ >C:\>ntpq -c rv pixie >assID=0 status=2484 leap_none, sync_uhf_clock/PPS, 8 events, >event_peer/strat_ch >g, >version="ntpd 4.2.0-a Sun May 8 06:01:21 UTC 2005 (1)", >processor="i386", system="FreeBSD/5.4-RELEASE", leap=00, stratum=1, >precision=-17, rootdelay=0.000, rootdispersion=2.125, peer=5113, >refid=PPS, reftime=ccf1ca39.2c218fe1 Tue, Dec 16 2008 6:33:29.172, >poll=6, clock=ccf1ca43.fbb22262 Tue, Dec 16 2008 6:33:39.983, state=4, >offset=0.008, frequency=41.314, jitter=0.005, stability=0.018 >C:\>ntpq -n -p pixie > remote refid st t when poll reach delay offset >jitter >============================================================================== >+78.129.142.80 195.66.241.3 2 u 46 64 377 22.441 2.319 >0.441 >+212.13.194.96 212.13.204.4 3 u 28 64 377 20.532 1.125 >1.354 >+213.130.44.252 128.250.33.242 2 u 37 64 377 22.043 1.964 >0.322 >-88.96.233.89 192.53.103.108 2 u 54 64 377 64.083 3.175 >0.593 >-130.88.200.6 193.62.22.98 2 u 3 64 377 26.839 10.450 >0.467 >*127.127.20.1 .PPS. 0 l 14 64 377 0.000 0.008 >0.008 >C:\>ntpq -c rv 78.129.142.80 >78.129.142.80: timed out, nothing received >***Request timed out >C:\>ntpq -c rv 212.13.194.96 >212.13.194.96: timed out, nothing received >***Request timed out >C:\>ntpq -c rv 213.130.44.252 >213.130.44.252: timed out, nothing received >***Request timed out >C:\>ntpq -c rv 88.96.233.89 >assID=0 status=06f4 leap_none, sync_ntp, 15 events, event_peer/strat_chg, >version="ntpd 4.2....@1.1520-o Tue Nov 4 15:54:13 UTC 2008 (1)", >processor="i386", system="FreeBSD/7.1-PRERELEASE", leap=00, stratum=2, >precision=-21, rootdelay=83.613, rootdispersion=24.271, peer=30612, >refid=192.53.103.108, >reftime=ccf1c8ec.39dc931f Tue, Dec 16 2008 6:27:56.226, poll=10, >clock=ccf1cac8.5e837314 Tue, Dec 16 2008 6:35:52.369, state=4, >offset=0.174, frequency=-66.147, jitter=0.438, noise=0.392, >stability=0.020, tai=0, >access_policy="experimental server not suitable for production use" >C:\>ntpq -c rv 130.88.200.6 >assID=0 status=46f4 leap_add_sec, sync_ntp, 15 events, >event_peer/strat_chg, >version="ntpd 4.2.0-a Wed Jul 23 12:48:29 BST 2008 (1)", >processor="i386", system="FreeBSD/6.3-STABLE", leap=01, stratum=2, >precision=-17, rootdelay=1.723, rootdispersion=54.425, peer=38190, >refid=193.62.22.98, >reftime=ccf1ca10.7782ce5d Tue, Dec 16 2008 6:32:48.466, poll=10, >clock=ccf1cade.07d6bcb6 Tue, Dec 16 2008 6:36:14.030, state=4, >offset=-10.270, frequency=-0.505, jitter=9.321, stability=0.004 >__________________________________________________________ _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
