Recommendation on NTP appliances/devices
Saku Ytti
saku at ytti.fi
Fri Apr 4 10:48:52 UTC 2014
On (2014-04-04 20:37 +1100), Julien Goodwin wrote:
> > Meinberg[0] pegs rubidium at ±8ms per year, if you need NTP to do say single
> > direction backbone SLA measurement you want to have microsecond precision.
>
> Those two statements don't go together.
Point I was making is that free-running rubidium is not accurate enough for
QoS measurements of IP core.
> Also outside the HFTers most of us don't care about a few milliseconds
> (sure an extra 50ms can be a pain, but is trivial to measure).
Jitter in backbone is low tens of microseconds, if you want to measure how
that changes over time, free-running rubidium is not going to cut it.
--
++ytti
More information about the NANOG
mailing list