[ntp:questions] Running ntpd with 1 PPS precision signal only

Rob nomail at example.com
Wed Oct 5 11:14:51 UTC 2011


alexandros kampolis <elefteros.skopeftis at gmail.com> wrote:
> Most (if not all) use a GPS receiver as a precision time source. This
> includes the NMEA messages and the 1 PPS output.
>
> The question is: can i use the GPS receiver configuration but replace
> the receiver with a precision 1 PPS source? I have a quartz frequency
> standard that is able to output 1 PPS pulses and i want to use this
> instead of the GPS receiver (which i do not have).
>
> I'm asking this because i do not know if ntpd requires both the NMEA
> messages and the 1 PPS pulses to work correct (or to work at all).

Having only a precision 1 PPS source will bring you nothing for time
synchronization, because these 1 PPS pulses are not synchronized to UTC.

A precision 1 PPS source will tell you exactly how long a second takes,
but not when the universally accepted seconds start.



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