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What is Ethernet MDI in the case of SFP interfaces

        I am reading on Ethernet and I understand that for copper ports, the MDI is the physical connections from the PHY to the medium's connector, including the physical port itself, where the cable is plugged. But a question pops into my mind:<br>

What exactly is the MDI when we are talking about Ethernet SFP interfaces?
Does the SFP represent an extension to the MDI ? Is MDI just the ‘port’ in which the SFP is plugged?

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