[time-nuts] Industrial control systems and IEEE 1588v2 time sync

[Peter Bell]

Pretty much any industrial Ethernet vendor makes switches that support 1588
- we were using ones from Siemens.



On Wed, Jul 31, 2013 at 1:29 PM, Scott McGrath <scmcgrath at gmail.com> wrote:

> The only switch I know that supports IEEE 1588 is the Cisco CGS 2520 and
> it was about 10 k before discount.  It's intended for use in smart grid
> applications
>
> NICs are about 500 each from a variety of vendors.  Altera makes most of
> the silicon
>
> Sent from my iPhone
>
> On Jul 31, 2013, at 12:19 AM, "Bill Hawkins" <bill at iaxs.net> wrote:
>
> > Group,
> >
> > Has anyone used IEEE 1588 to synchronize clocks on an Ethernet network?
> >
> > I was involved in the design of time sync for Foundation Fieldbus circa
> > 2000.
> > We needed one millisecond accuracy, so we went with SNTP on local
> > networks.
> > I've just seen an ad for a switch that can do 1588, and looked up what
> > it does.
> >
> > Microsecond accuracy is impressive, but what does it cost?
> >
> > Industrial sensors are generally sampled at about 10 millisecond
> > intervals out
> > to several seconds. SNTP would appear to be very adequate for time
> > stamps as
> > there is uncertainty introduced by when the computer gets around to
> > sampling
> > the sensor in its sampling and control cycle.
> >
> > Any thoughts appreciated.
> >
> > Bill Hawkins
> >
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