RE: [SI-LIST] : FCAL DB9 cable shield

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From: Chris Cheng (hycheng@3pardata.com)
Date: Tue Nov 16 1999 - 17:28:09 PST


that is exactly why i think the shield or at least the plug
housing should be floating.
FCAL AC termination should block the power feed thru the
differential signal but i am not sure about the shield and
the plug. it sounds like any potential difference between
the two chasis will float through the shield and cause emi
problem. since FCAL is by definition differential and no
return current needed. the only current that flows in the
shield will be noise current.
chris

> -----Original Message-----
> From: owner-si-list@silab.eng.sun.com
> [mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Tom gandy
> Sent: Tuesday, November 16, 1999 3:21 PM
> To: si-list@silab.eng.sun.com
> Subject: RE: [SI-LIST] : FCAL DB9 cable shield
>
>
> >Fibre Channel DB9 Cables from Amphenol and W.L. Gore (with and without
> >built-in equalizer) short the shield to the plug housing on both ends.
> >
> >
> >Farrokh Mottahedin
> >
> >Quantum Corp.
> >500 McCarthy Blvd.
> >Milpitas, CA 95035
> >
> Wouldn't this cause nasty galvanic currents through the shield if the two
> pieces of equipment, attached by the cable with the DB9s, were,
> say, on two
> different phases of a three phase power feed to a building.
>
> Am I missing something?
>
> thanks
>
> Tom Gandy
> Industrial Catalyst
>
>
>
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