T568A and T568B are two different standardized ways of ordering the individual wires inside an Ethernet cable. T568A is designed for backward compatibility with older telephone wires; T568B is designed for better signal isolation and noise protection for newer networking systems and products.
What is the difference between Cat 5 A and B?
The only difference between T568A and T568B is that the orange and green pairs are interchanged. T568A wiring pattern is recognized as the preferred wiring pattern for this standard because it provides backward compatibility to both one pair and two pair USOC wiring schemes. ... the most widely used wiring scheme.
How do I know if I have cat5e A or B?
If the first and second pin are orange, the cable is 568B. If the first and second pins are green, the cable is 568A. If one end of the cable is A and the other end is B then you now have a cross-over.
How do I know if my Ethernet cable is A or B?
The images below depict the cable pin-outs for straight-through and cross-over Cat-5 Ethernet cables that conform to EIA/TIA industry standard for 568 A and B. If the first and second pin are orange, the cable is 568B. If the first and second pins are green, the cable is 568A.