[time-nuts] wifi with time sync

Bob Camp kb8tq at n1k.org
Fri Jan 13 15:12:38 EST 2017


I’m sure you are right about the response time. Right now the variation is running almost 3 ms
at one sigma on a ping so there is a lot to do simply to get the accuracy anywhere near 1 us.


> On Jan 13, 2017, at 2:35 PM, Chris Caudle <chris at chriscaudle.org> wrote:
> On Fri, January 13, 2017 11:40 am, Bob Camp wrote:
>> The ping response is anywhere from 2 ms out to 400 ms. Most of
>> the time it's in the 3 to 9 ms range. Simply taking that
>> down to < 1 us would be a really big deal.
> I doubt that the response time will get that low, rather the time sync
> will be moved lower in the hardware stack so that the variation stays
> below 1us so it can be compensated as a systematic offset.  Basically a
> Wi-Fi version of the hardware time stamping that a lot of NIC's do now for
> PTP support.  Just a guess at this point.
> -- 
> Chris Caudle
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