brief introduction
568A and 568B refer to the two color codes of the 8-pin connection (RJ45 connector is the most common) module socket/plug. According to the international standard * * *, there are four line sequences: T568A, T568B, USOC(8) and USOC(6). Generally, the first two are commonly used. Peel off a pair of twisted pairs, and you will see four pairs of twisted single-stranded plastic wires: green, blue, orange and brown. Both of them conform to ANSI/TIA/EIA wiring standards, but you may not want to exchange them in practical work. The only difference between these two color codes is the interchange of orange and green line pairs. Because of backward compatibility, T568B circuit diagram is considered as the preferred circuit diagram. T568A wiring diagram is marked as optional, but it is still widely used. In short, this technical specification defines the wiring diagram of sockets/plugs with structured wiring.
detailed information
The sequence of T568A line is: white, green, green, white, orange, blue, white, blue, orange, white, brown and brown.
The sequence of T568B line is: white orange, orange, white green, blue, white blue, green, white, brown and brown.
The linear order of USOC(8) is: white brown green white orange blue white blue orange white green brown.
The linear order of USOC(6) is: empty, white, green, white, orange, blue, white, blue, orange, green and empty.
T568B is a commonly used line sequence. In the transmission of 100M data, four lines of 1.2.3.6 are mainly used. If two switches are connected by twisted pair, the line sequence at the other end is: white green, green, white orange, blue, white blue, orange, white brown and brown, which is called cross line.