[ntp:questions] Standalone PPS

David Lord snews at lordynet.org
Thu Jun 13 19:57:26 UTC 2013

patrick200075011 at gmail.com wrote:
> Hi
> The super stable means easily 1ppm which means about one second every 16 days. Get a look to www.matel-fordahl.fr or www.kvg-gmbh.de . However my PCB can be implemented with classics DIL14 pins 1 7 8 14 footprints for people who has very bad computer clock or simply wants to put the clock outside the hot computer box or even outside the hot computer room.
> My goal is to keep internal machines on time to each other more than to keep an absolute clock. The internal ntp is enough for that as networks are 100M or 1 giga. The PPS is used only to MY stratum 0 (my PCB has 2 outputs as the max232 has 2 but I am using only one for the ntpd).
> The orphan mode is never used as long as a source is available. The IS always available, it is this one that I need to get rid after the initialization.
> The problem is here: I need the local for initialization. But the local later on makes a conflict because it is a bad source.
> The time1 and time2 would have been the solution to adjust the phase on startup but I don't want to do that on each power up. I can do that if I would be able to use back quotes to call a script.
> Cheers

I'd suggest not trying to use PPS but derive the system clocks
from your ocxo.

Otherwise you have a problem to synchronize the PPS to one of
your systems.


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