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Posted by Pat Horridge on 11/07/07 14:51
Not sure exactly what the isolators do but I imagine they have voltage
limiters installed so that anyting outside the safe range is shunted away.
"Johan Stck" <johan@stack.se> wrote in message
news:5pd9ucFq0g4gU1@mid.individual.net...
> Jan Panteltje skrev:
>
>>
>> I am a bit surprised modern cameras do not have 100Mb or gigabit
>> Ethernet.
>> Ethernet is galvanically isolated.
>> And it has the advantage that it works almost everywhere, also remotely.
>
> It is history of course, but I *think* it stems from the fact that
> firewire is "deterministic" i.e. you are guaranteed a given capacity,
> which is necessary for real-time video transfer.
>
> Ethernet is/was not deterministic. (You get what you get, and no whining
> about it....)
>
> What we can see is that newer cameras have USB2 for transfer of captured
> video.
> But then, transfer of captured video does not need a guaranteed transfer
> rate.
>
> I did not know about the existance of "firewire isolators"
> Would they protect from frying cameras when connected to a PC on a
> un-grounded power outlet? (I mean, they have to transfer signal ground
> (which could be at 110 volts ac) won't they?)
>
> /JS
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