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X557 Common Mode Sense Input

ZMicro
Beginner
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Regarding the following signals on X557:

 

ZMicro_0-1734629516014.png

On the reference schematic these connect to a fifth transformer in the Rj-45 magnetics:

ZMicro_1-1734629623887.png

 

I will be using a discrete Ethernet transformer and cannot find one with five transformers.

Is it necessary to have this or can I leave common mode sense inputs disconnected?

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