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How can I configure RealTek RTL8211F for 100Base-T?

They are internally terminated, but leaving them unconnected is not the same as wiring it to a transformer and not using them if the link partner doesn't. You should ask for manufacturer ...
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Ethernet cable testing

For Ethernet, magnetics are used only in devices, never in cables or wall jacks (at least in standard installations). As for PCB-mount connectors that you might use in your project, some have built-in ...
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