[ntp:questions] How to debug GPS PPS?

xyz-2041 xyz2041 at gmail.com
Mon Dec 21 19:28:46 UTC 2009


ntpq> pe  GPS line reads:

 GPS_NMEA(1)     .GPS.            0 l    -   64    0    0.000
0.000   0.001


ntpq> rv
assID=0 status=06f4 leap_none, sync_ntp, 15 events, event_peer/
strat_chg,
version="ntpd 4.2.4p7 at 1.1607-o Wed Dec 16 07:24:35 UTC 2009 (1)",
processor="i386", system="FreeBSD/7.2-RELEASE", leap=00, stratum=2,
precision=-20, rootdelay=53.694, rootdispersion=31.936, peer=3269,
refid=18.26.4.105,
reftime=ceda45a9.1bda1b54  Mon, Dec 21 2009 13:06:17.108, poll=8,
clock=ceda4a7b.9a36d363  Mon, Dec 21 2009 13:26:51.602, state=4,
offset=-3.784, frequency=-47.665, jitter=2.066, noise=3.569,
stability=0.026, tai=0



# ntptime
ntp_gettime() returns code 0 (OK)
  time ceda48c0.01611ba4  Mon, Dec 21 2009 13:19:28.005, (.005388419),
  maximum error 445680 us, estimated error 3569 us, TAI offset 0
ntp_adjtime() returns code 0 (OK)
  modes 0x0 (),
  offset -3119.252 us, frequency -47.665 ppm, interval 4 s,
  maximum error 445680 us, estimated error 3569 us,
  status 0x2001 (PLL,NANO),
  time constant 8, precision 0.001 us, tolerance 496 ppm,
  pps frequency -47.445 ppm, stability 0.000 ppm, jitter 0.000 us,
  intervals 0, jitter exceeded 0, stability exceeded 0, errors 0.

What to check next?




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