[SI-LIST] Re: gigabit ethernet trace length
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "stubenner@xxxxxxxx" <stubenner@xxxxxxxx>, "Peterson, James F \(FL51\)" <james.f.peterson@xxxxxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Wed, 31 May 2006 08:14:36 -0700
Doesn't that sound a bit arbitrary?
> [Original Message]
> From: <stubenner@xxxxxxxx>
> To: <leeritchey@xxxxxxxxxxxxx>; Peterson, James F \(FL51\)
<james.f.peterson@xxxxxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
> Date: 5/30/2006 7:30:44 PM
> Subject: [SI-LIST] Re: gigabit ethernet trace length
>
> Maybe this apparently arbitrary restriction is intended to minimize the
> chance of coupling unintended energy, either common-mode or
> differential-mode, into the circuit after the CM chokes in the magnetics
> thereby creating a radiated emissions hazard.
>
> Stu Benner
> www.emcwizard.com
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On
> Behalf Of Lee Ritchey
> Sent: Tuesday, May 30, 2006 3:49 PM
> To: Peterson, James F (FL51); si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: gigabit ethernet trace length
>
>
> Not a problem, works just fine. Don't know what might be behind the
> restriction someone put on you.
>
>
> > [Original Message]
> > From: Peterson, James F \(FL51\) <james.f.peterson@xxxxxxxxxxxxx>
> > To: <si-list@xxxxxxxxxxxxx>
> > Date: 5/30/2006 11:59:01 AM
> > Subject: [SI-LIST] gigabit ethernet trace length
> >
> > greetings,
> >
> > In a 1000BaseT Ethernet circuit, I would like to extend the distance
> > between the magnetics and the RJ-45 connector to about 6 to 8 inches
> > (including good SI practice : ref planes, controlled Z, matched
> > lengths, etc.). Everything I read says that you can't do that, that it
> > must be less than an inch, but I don't understand why. Can someone
> > explain?
> >
> > thanks -
> > Jim Peterson
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