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Re: [rtl] RT Ethernet


  On Fri, 10 Sep 1999, Tomasz Motylewski wrote:
 [...]
 > I know this is no longer hard real time, but I also have a feeling
that
 > people writing about RT ethernet do not really need it (I may be
wrong, but
 > please show me a real life situation when 1 ms deadline on the net
has to be
 > met at more than 99.9999 % of cases).


Distriubuted control systems.
IF the technology is available we'll use it. 
  ( like next month .. running a rolling mill by Feb2000 if it works
well enough)

A HARD 1mS deadline opens up some really good options

   shared memory for example.

We will run control say every 5mS and sync any memory changes inbetween
runs.

Current fiber optic shared memory solutiuons are approx $5,000 per node.
100mHz ethernet approx $50 per node not to mention the fiber costs.


I am really excited by this capability.

Phil Wilshire
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