The definitions I've read say that crossover cable is cabling which the receive and transmit pairs are swapped around. My question is based on the fact that beyond this, I've seen some diagrams which swap the blue and brown pairs of wires as well as the orange and green wires.
What's the purpose of that - I thought those pairs are unused? Is it just for Gigabit Ethernet?
Do all types of ethernet cable classify as crossover as long as at least the transmit and receive pairs are swapped, and following that, would a cable with only the brown and blue pairs switched be called straight-through or crossover?
Edit: referring to T568A and T568B