0

I need to use the medical ethernet magnetics by Pulse HXU6200NL (it is the only 2MOPP medical-certified PoE magnetics I can find). These are of the rather common transformer/choke coil topology. My confusion comes from the location of the common-mode choke coils.

As I understand common practice, and most magnetic data sheets I have seen (except by Pulse), you should place the common-mode chokes on the cable side of the magnetics. The intention being avoiding the injection of circuitry-generated EMI into an (unshielded) ethernet cable.

But Pulse places the chokes on what they denote as the PHY IC-side of the magnetics.

Which side is the correct one? Should I ignore Pulse’s data sheet regarding this?

(There is a related, but unanswered, question regarding this)