![]() ![]() This wiring scheme constitutes a crossover cable. Since 10BASE-T and 100BASE-TX use pairs 2 and 3, these two pairs must be swapped in the cable. ![]() ![]() One terminal may be connected directly to another without the use of a switch or hub, but in that case, the crossover must be done in the cabling. 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. Motivation 8P8C modular crossover adapter Many network devices today support auto MDI-X (aka "auto crossover") capability, wherein a patch cable can be used in place of a crossover cable, or vice versa, and the receive and transmit signals are reconfigured automatically within the device to yield a working connection. Intentionally crossed wiring in the crossover cable connects the transmit signals at one end to the receive signals at the other end. By contrast, straight through patch cables are used to connect devices of different types, such as a computer to a network switch. two computers (via their network interface controllers) or two switches to each other. It is most often used to connect two devices of the same type, e.g. Cable wired to allow two similar devices to be directly connectedĪn Ethernet crossover cable is a crossover cable for Ethernet used to connect computing devices together directly. ![]()
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