Pinout Options for RJ-45 Connectors
Each of the drawings in the figure represents an RJ-45
connector. The RJ-45 connector allows eight wires to be inserted into it.
EIA/TIA standards suggest the numbering schemes for the eight pin locations and
the pairs of wires, knowing that a twisted pair is needed for data transmission.
The standard also specifies which color of wire goes into pin position 1, 2, and
The RJ-45 connectors have clips on the side that allow you to
easily insert the connector into the plug (hole) in the networking card in a
computer. At that point, the connector is secure and should stay put. If you
push the clip close to the rest of the connector, it releases the connector from
the card. So, the clip helps keep the connector secure and allows you to pull
the connector out when you are ready.
So, why does all this matter? In the next few pages, it will
all come together as you see how NICs try to use the cables and wires.