Intel® 82551QM/ER/IT Fast Ethernet PCI Controller MDI-X Functional Overview Application Note

This application note describes the 82551QM/ER/IT Fast Ethernet PCI Controller's Management Data Interface MDI\MDI-X feature. The MDI/MDI-X feature provides the ability to automatically detect the required cable connection type and configure the controller-side MAU to the cable type. This feature effectively allows all properly wired Ethernet cables, usable with any Ethernet device, to be connected to the 82551QM/ER/IT without any additional external logic.

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