This sounds relevant:
There is a physical switch that cuts the connection between the PC in
> the "lock up" and the network connection to the rest of the world.
> When certain time comes the PC as allowed to communicate with the rest
> of the world by someone flipping the physical switch.
>
> There are actually a few competing companies trying to get the same
> financial news information from the "lock up" to the outside in the
> automated trading world as fast as possible after the switch is
> flipped, so the milliseconds count.
>
> I was passively involved in some of the discussions regarding this,
> and the partial solution to this was to insert a hub on each side of
> the physical cut-off switch to keep the link state as up, there are
> all sorts of other issues related to this that are unrelated to Linux
> itself and are not being mentioned.
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