Crossover Ethernet Cable

What is a Crossover Ethernet Cable and when is it needed? A Crossover Ethernet Cable is an Ethernet cable that has a different wiring scheme at each end. To be more exact, it has 568A wiring scheme on one end and 568B on the other end.
A Crossover Ethernet Cable is used to connect “like” devices together, such as a PC to a PC or two switches to each other. Connecting similar devices to each other requires a crossover wire due to the format in which the devices send and receive information.
PCs use pins 1 and 2 to send information, while using pins 3 and 6 to receive information (refer to wiring scheme images).

T568BT568A
In order to eliminate the need for a Crossover Ethernet Cable the two computers may be connected to each other through a hub or a switch where the crossover is done internally, if appropriate for the system in question.
Different from a Crossover Ethernet Cable, a Straight Through Cable is a cable with the same wiring schemes on both ends. It does not matter whether it is 568A or 568B. This type of cable connects between a hub and a PC or two different devices. The hub’s format sends information on pins 3 and 6 (refer to wiring scheme image) and receives information on pins 1 and 2.