Automatic crossover

If one of two connected devices has the automatic MDI/MDI-X configuration feature there is no need for crossover cables. Introduced in 1998, this made the distinction between uplink and normal ports and manual selector switches on older hubs and switches obsolete.

Although Auto-MDIX was specified as an optional feature in the 1000BASE-T standard[2], in practice it is implemented widely on most interfaces. It has been available for example on Apple Inc. computers since about the Power Mac G5.Besides the eventually agreed upon Automatic MDI/MDI-X, this feature may also be referred to by various vendor-specific terms including: Auto uplink and trade, Universal Cable Recognition and Auto Sensing.

December 6, 2011

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