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RJ-45 ports/heads are used in all wired ethernet NICs. The heads have eight pins. The port is compatible with the connectors on Ethernet cards. RJ stands for registered jack, there are several types each clipping into the connector on the motherboard an contain several twisted pair of cables, color-coded by order based upon installation situational factors such as how the connectivity infrastructure needs to be laid out or constructed. We'll outline the differences between color plans TS68A and B, and revisit the distinctions between Cat 3, 5, 5e, 6, and 6g cables as it relates to purpose, speed, data transfer rate, and distance.