[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
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.



More information about the Time-nuts_lists.febo.com mailing list