[ntp:questions] Time server question

David Taylor david-taylor at blueyonder.co.uk.invalid
Tue Jun 25 09:52:40 UTC 2019

On 25/06/2019 01:33, Chris wrote:
> Thanks for all the replies. I guess the next thing to do is to build
> a working system, then evaluate to see how it can be improved. All
> the kit is in the same rack and with dedicated hardware interfaces,
> network latency shouldn't be a problem. This is effectively a real
> time requirement, so any code running needs to be consistent in terms
> of  response time to minimise jitter on the timing. Need to get
> a feel for acceptable delay and response times, so will look to see
> what others have done in the past.
> I like the idea of using a 1 pps signal from the gps for fine tuning.
> Rough time and date via the network ntp and the 1pps to fine tune it.
> That could maintain the stratum 1 timing quality, as the 1pps is
> generally within 10's of nS of UTC, but need to look into how ntpd
> would handle that and also how to introduce that into the system.
> Already use an ex telco gps for a lab frequency standard, but of
> course, frequency != time of day. A dedicated embedded solution might
> be the best bet, but other options might include a cheap netgear
> router to provide the isolation, as it would only be handling ntp
> packets at low and consistent system and network load.
> Nothing is ever as easy as it seems, as usual...
> Chris

Chris, would one or more of these help?


No OS to get in the way.

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