[SI-LIST] Re: What is correctly placement of Transformer? Locate Near IC or RJ45 CONN? Why?

Since Ethernet wiring can be routed through areas with AC, the=20
possibility of accidental connection of AC to Ethernet exists.
This is why the transformers are rated in KV. Safety standards
have minimum spacings that must be maintained between dangerous=20
signals (in this case Ethernet) and low voltage signals (sometimes=20
identified as SELV). The easiest way to enforce this is to keep=20
the Ethernet transformer near the edge of the PCB and keep traces=20
and planes away from line-side Ethernet signals and the transformer.

                                        Curt=20

Curt McNamara. P.E.=20
Senior Electrical Engineer=20
Logic Product Development=20
411 Washington Ave. N Suite 101=20
Minneapolis, MN 55401=20
Tel 612-436-5178=20
Fax 612-672-0443=20
curtm@xxxxxxxxxxx=20
www.logicpd.com=20
This message (including any attachments) contains confidential =
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of =AA=FC=A5=C8
Sent: Sunday, February 26, 2006 7:52 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] What is correctly placement of Transformer? Locate =
Near IC or RJ45 CONN? Why?


Hi all,

Do you know whta's the correct placement of transformer of 10/100=20
Ethernet?=20

Should it be placed near Ethernet control IC or near RJ45 CONN? For what =
reasons? EMI? Function?=20

Why?

If you can help to give me some information is appreciated.

Thanks you in anticipation,

Binchuan, Wang




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