[SI-LIST] Re: Gigabit ethernet placing and routing related question
- From: steve weir <weirsi@xxxxxxxxxx>
- To: "Rose, Michael" <mrose@xxxxxxxxxxxxxxxxx>
- Date: Sun, 31 Oct 2010 20:54:21 -0700
There are two important points:
"Ground" is a misnomer. At RF frequencies the chassis has no special
relationship to any potential somewhere in the external environment.
The chassis is just a node, and it forms a radiating antenna with all
wires that penetrate it. What makes the chassis special is that one
with limited apertures is effective at blocking radiated energy from
passing either direction between the inside and the outside.
Coupling differences between signals past the magnetics and the chassis
result in mode conversion that aggravates EMI headaches. Careful
attention to mode conversion containment is effort well-spent.
Steve.
Rose, Michael wrote:
> I think he means that the line side is balanced and the phy side in
> unbalanced, referenced to "logic ground."
>
> mike
> ________________________________________
> From: si-list-bounce@xxxxxxxxxxxxx [si-list-bounce@xxxxxxxxxxxxx] On Behalf
> Of Stefan Milnor [stefan.milnor@xxxxxxxxxxxxxx]
> Sent: Sunday, October 31, 2010 3:04 PM
> To: Lee Ritchey; Peter zhu; si-list@xxxxxxxxxxxxx; jhasson@xxxxxxxxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Gigabit ethernet placing and routing related question
>
> Chassis GND: the potential that your chassis is at
> ________________________________
>
> From: si-list-bounce@xxxxxxxxxxxxx on behalf of Lee Ritchey
> Sent: Sun 10/31/2010 9:52 AM
> To: Peter zhu; si-list@xxxxxxxxxxxxx; jhasson@xxxxxxxxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Gigabit ethernet placing and routing related question
>
>
>
> There is not such thing as "chassis ground". What is really meant by this
> statement?
>
>
>
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--
Steve Weir
IPBLOX, LLC
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