A standard straight-through cable is used for this purpose where each pin of the connector on one end is connected to the corresponding pin on the other connector. When a terminal device (with an MDI port) is connected to a switch or hub, this crossover is done internally in the switch or hub ( MDI-X port).
The 10BASE-T standard was devised to be used with existing twisted pair cable installations with straight-through connections. This requires that the transmit pair of each device be connected to the receive pair of the device on the other end.
The 10BASE-T and 100BASE-TX Ethernet standards use one wire pair for transmission in each direction.
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