RJ45 Cable
RJ45 is a well-known ethernet connectivity connector that allows users to connect through wired internet. It is an ethernet cable consisting of 8 wires(4 pairs of wires). These cables follow a specific color code with respect to the arrangements of the wires.
RJ45 Connector:
There are two standards for this connector, RJ45, known as T568A and T568B. Each one of these functions as a pin IN and pin OUT for an Ethernet connection that transfers data. The wiring of the green and orange pairs is the only difference between these two cables.
RJ45 cable Pin Out color code for T568A & T568B:
T568A is a commonly used pinout standard for ethernet cables. The highlight of this standard is that it is backward compatible with one-pair as well as two-pair USOC (Universal service ordering code).
T568B standard gives better protection from noise, It also isolates the signal more effectively as compared to T568A. It is only backward compatible with a one-pair USOC wiring scheme.
Straight Through vs Crossover Cable
What Is Straight Through Cable?
A straight-through cable is a type of twisted pair cable that is used in local area networks to connect a computer to a network hub such as a router. On a straight-through cable, the wired pins match. Straight-through cable uses one wiring standard: both ends use the T568A wiring standard or both ends use the T568B wiring standard.
A crossover Ethernet cable is an Ethernet cable used to connect computing devices directly. Unlike straight-through cable, the RJ45 crossover cable uses two different wiring standards: one end uses the T568A wiring standard, and the other end uses the T568B wiring standard. The internal wiring of Ethernet crossover cables reverses the transmit and receive signals. It is most often used to connect two devices of the same type: e.g. two computers (via network interface controller) or two switches to each other.
Conclusion:
The connectors come in two standards, T568A and T568B. A cable can have the same or different connectors at both ends. Based upon the type of cables like Straight and crossover. with straight over both the ends have the same connectors either T568A or T568B and in crossover both the ends are different.