[ntp:questions] ntp server specs

unruh unruh at wormhole.physics.ubc.ca
Wed Jun 15 08:47:54 UTC 2011


On 2011-06-14, Stephan Skrodzki <skrodzki at stevekist.de> wrote:
> Am Dienstag, den 14.06.2011, 16:16 +0000 schrieb unruh:
>> On 2011-06-12, chipper <black at intre.nt> wrote:
>> > If I wanted to feed a group of linux machine from a common PPS source, what hardware and which Linux would I need?
>> 
>> An amplifier 
>> (or rather impedance matching chip) and some lines (eg 50 ohm cat5
>> cable) to connect the PPS to the various machines
>> Any Linux, with gpsd onthem and ntpd or chrony
>
> at least gpsd will not work with PPS source only, as it needs also GPS
> information. The rest I am also in the phase to find out :-)

Then use shmpps instead.
It will wait until the system has a lock from some other ntp source to
withing about .2 sec, and then starts the pps feed, using the system
time for the seconds.

>
> BR
>  Steve




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