Best Andy,

Thank you too, for an answer !

The technology "behind" the PC is not so important. It is the method of =
insulating it that should be small and smooth. It is a problem to wire =
up bulky boxes just for the sake of the isolation.

All the best

Sven in Sweden


-----Ursprungligt meddelande-----
Fr=E5n: Andrew Kunz <akunz@TDIPOWER.COM>
Till: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Datum: den 20 september 2000 13:04
=C4mne: Re: [EE]: Opto-isolated Ethernet connection


>
>
>
>Is _Ethernet_ really necessary?  I used to work for a military =
installation in
>the late 80's, and we used Token Ring on fiber for our LAN.
>
>Andy
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>
>Richard Prosser <Richard.Prosser@ENERGY.INVENSYS.COM> on 09/19/2000 =
04:10:19 PM
>
>Please respond to pic microcontroller discussion list =
<PICLIST@MITVMA.MIT.EDU>
>
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>
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> To:      PICLIST@MITVMA.MIT.EDU
>
> cc:      (bcc: Andrew Kunz/TDI_NOTES)
>
>
>
> Subject: Re: [EE]: Opto-isolated Ethernet connection
>
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>Math Associates used to supply a wide range of small optical fibre TX =
and
>RX units designed for short range (10s of metres) as well as the longer
>range suff. You might find plastic fibre preferable to glass also as it =
is
>easier to handle  and  launch into. The lower bandwidth and higher loss
>shouldn't be a problem over the short distances you're probably looking =
at.
>When I was involved the more common units were RS232 & Analogue links =
but I
>imagine by now (10 years later !) ethernet would also be available.
>
>I have seen designds that use a high intensity light powering a remote =
unit
>via an optical fibre and some special sort of photo detector  - close =
to
>the ultimate in isolation!
>
>Richard P
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>Sorry to trouble you with this OT, but I feel there is an answer "Out
>There" that I have failed to find.
>
>I have several computer applications that are both connected to a =
patient
>(basically) and a network for storing data on a server. For patient =
safety
>reasons the PC is isolated (including measuring electronics), but the
>system is not isolated unless the ethernet connection is run through a
>fiber - or something.
>
>The optofiber interfaces we use are too bulky, and inteded to run =
optical
>fibers for a substancial length. Not a 2 meter fibre.
>
>My question to you is, is there a j45 (or-whatever-they-are-called)-
>connector with a optical isolator(/-coupler) in it? It really shouldn't
>have to more than a 1 " cube.
>
>OR a network-card, that has this built in (4kV isolation preffered).
>
>OR is this a neat PIC-project to put in que ? (SEE it isn't off =
topic!!).
>Opto for data, and a "high" frequency transformer for powering the =
isolated
>side would be what is in that cube....
>
>
>Sven G Milton
>Milton Medicinteknik KB
>Herrestad

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