How come a cross over cable transmits on 1&2 and receives on 3&6?

Question

How come a cross over cable transmits on 1&2 and receives on 3&6? What’s the deal with that configuration, does it have some thing to do with electromagnetic interference? Or does it have to do with the way the pins are arranged?

Answer 1

Hi Joe,

A crossover cable is a cable that sends output signals on one connector to the input on the other connector. This allows two electronic devices to perform full-duplex communication.

Usually the term refers to an Ethernet crossover cable, but other cables follow the same principle. It allows two devices to communicate without the necessity of a switch, router or a hub.

Norm