| Re: [chrony-users] Chrony offset and stability adjustments? |
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On Mon, Jan 07, 2019 at 04:34:51PM +0100, Miroslav Lichvar wrote:
> On Mon, Jan 07, 2019 at 03:11:32PM +0000, LeBlanc, Daniel James wrote:
> > Hi Miroslav.
> >
> > The requirement that we are trying to meet is " Time accuracy must be within 1 ms of true time.", as described in Section 5.18 of https://www.nena.org/resource/resmgr/standards/NENA-STA-010.2_i3_Architectu.pdf.
>
> Interesting.
I just noticed you mention "root dispersion", but for accuracy it's
important to check the "root distance", which includes also the root
delay. If the round-trip time to the server is larger than few
milliseconds, you won't be able to guarantee the clock is accurate to
1 millisecond.
--
Miroslav Lichvar
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