[ntp:questions] Frequency Errors +500 PPM...

Kit Plummer christopher_plummer at Raytheon.com
Thu Feb 3 20:02:59 UTC 2005


FWIW, here is a snip of my ntp.log file:

  3 Feb 10:00:14 ntpd[412]: kernel time sync enabled 0001
  3 Feb 10:04:33 ntpd[412]: synchronized to GPS_BANC(0), stratum=0
  3 Feb 10:36:45 ntpd[412]: time reset -0.873229 s
  3 Feb 10:36:45 ntpd[412]: frequency error -512 PPM exceeds tolerance  
500 PPM
  3 Feb 10:41:02 ntpd[412]: synchronized to GPS_BANC(0), stratum=0
  3 Feb 11:47:44 ntpd[412]: no servers reachable
  3 Feb 11:48:49 ntpd[412]: synchronized to GPS_BANC(0), stratum=0
  3 Feb 12:03:51 ntpd[412]: time reset -0.871702 s
  3 Feb 12:03:51 ntpd[412]: frequency error -512 PPM exceeds tolerance  
500 PPM
  3 Feb 12:08:09 ntpd[412]: synchronized to GPS_BANC(0), stratum=0

What can I do to control the PPM?  This is a SPARC-based VME board,  
getting its clock from a VME-based SYNCCLOCK32 GPS/IRIG card.

TIA,
Kit

On Feb 3, 2005, at 9:46 AM, Kit Plummer wrote:

> Hey folks,
>
> I am having NTP prolbems.  Obviously.  But, I am not sure it is NTP,  
> or my reference driver - or hardware for that matter.  The problem  
> appears to be related to an extremely high PPM.  Am I understanding  
> correctly that this number is derived from whatever is in the  
> ntp.drift file?
>
> Well, the real problem appears to be a 1 second step - sporadically.   
> Though I haven't really been able to prove that either...it is just  
> heresay from a system user.
>
> Also,  can someone explain this output from ntpd -d:
>
> peer GPS_BANC(0) event 'event_reach' (0x84) status 'unreach, conf, 1  
> event, event_reach' (0x8014)
>
> If there is some other information I can provide for troubleshooting  
> purposes let me know.
>
> TIA,
> Kit
> ----------------------------------------------------------------------- 
> -
> Kit Plummer
> Operations Research and System Performance Dept.
> Raytheon Missile Systems
>
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