[ntp:questions] System time ramps forcing step correction?

A C agcarver+ntp at acarver.net
Sun Sep 9 23:01:53 UTC 2012


On 9/9/2012 15:41, E-Mail Sent to this address will be added to the 
BlackLists wrote:
> A C wrote:
>> Has anyone seen a system with GPS/PPS have its system
>>   time ramp/slew ahead by over a second requiring a step
>>   correction?
>
> Prefer the PPS source?
>
> GPS time is usually only second relative without the PPS,
>   and will sometimes drift around a lot within the second
>   on non timing GPSes.
>
>   I have GPS chips on embedded systems that the serial sentence
>    always seems to wander around 20ms to 50ms.
>

NTP doesn't let me prefer the PPS source (ATOM).  I'm forced to prefer 
some other source and let PPS activate on its own.


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