[SI-LIST] Gigabit ethernet placing and routing related question
- From: jhasson@xxxxxxxxxxxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 27 Oct 2010 22:57:47 +0200
Hi,
I am currently working on a project involving routing of gigabit ethernet
signals between a PHY and the outside world. Basically, after going
through the routing recommendations, it is most of the time recommended to
have the PHY close to the magnetics close to the RJ45 connector. The
closer the better.
I went though the si-list about this subject and I found some advice like
the transformer should be close to the phy but the CM choke should be
close to the connector. The idea of having an EMI protection device close
to the connector seems to make sense but I do not understand the reason
why the transformer should be close to the PHY : what is the advantage
versus having both the magnetics and the CM choke near the connector and
therefore a "long" distance between the PHY and the magnetics ?
Although having the CM choke near the connector seems to make sense I have
also read about the fact that it it was ok to have quite a distance
between the transformer/choke and the connector but no mention there about
some restrictions concerning the PHY to transformer distance.
Could someone, give (again ?) some insights into the pros and cons of each
topology ?
Best regards,
JF Hasson
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