[time-nuts] Industrial control systems and IEEE 1588v2 time sync
Scott McGrath
scmcgrath at gmail.com
Wed Jul 31 05:29:37 UTC 2013
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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