[time-nuts] Timing on Ethernet

Bob Paddock bob.paddock at gmail.com
Fri Aug 3 19:59:36 EDT 2007

On Friday 03 August 2007 07:22, Pablo Alvarez Sanchez wrote:

> At CERN we are considering the possibility of using Ethernet as a real
> time field bus. 

There are a couple of projects that have already gone down this road,
for one:


Related are, but these are more at the operating system level than
the line timing level:

On my assumption that you mean Hard Real Time:

Have you looked at FlexRay and/or TTP?  Standard communications to be used
in the 2008 model year in most cars.  Several chips support FlexRay today.
Also used in "by-X" controls, like "Fly-by-wire", "break-by-wire" etc.
You can get chips for FlexRay from various players today.



Come to think of it I don't recall ever seeing TTP or FlexRay mentioned
here on the Time-Nuts list?  They get into things like:

"The clock drift must be no more than 0.15% from the reference clock, 
so the difference between the slowest and the fastest clock in the system is no greater than 0.3%."

 http://www.softwaresafety.net/ http://www.designer-iii.com/

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