[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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