[SI-LIST] Re: What is correctly placement of Transformer? Locate Near IC or RJ45 CONN? Why?
- From: "Curt McNamara" <CurtM@xxxxxxxxxxx>
- To: <binchuan2000@xxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 27 Feb 2006 09:33:38 -0600
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 =
information intended for a specific individual and purpose, and is =
protected by law. If you are not the intended recipient, you should =
delete this message and are hereby notified that any disclosure, =
copying, or distribution of this message, or the taking of any action =
based on it, is strictly prohibited.
-----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
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to: =
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at: =20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
