[SI-LIST] Re: gigabit ethernet trace length

Just keep in mind that part of the Ethernet spec includes 2KV isolation
(one of the reasons for the transformer, after all). If you can keep the
isolation region in tact for 6-8", there's no reason it won't work.


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Gary Thompson                        Phone: (512) 821-6521
Systems/Applications Engineering       FAX: (512) 821-6810
Agere Systems                       Mobile: (512) 751-8115
Multi-Service Networking Division    Email: gary@xxxxxxxxx
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Lee Ritchey
Sent: Tuesday, May 30, 2006 2:49 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=20
> between the magnetics and the RJ-45 connector to about 6 to 8 inches=20
> (including good SI practice : ref planes, controlled Z, matched=20
> 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=20
> explain?
>
> thanks -
> Jim Peterson
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