There are 3 main types of RJ-45 cables that you will run across in networking, both LAN and WAN.
To identify the RJ-45 cable type, hold the two ends of the cable next to each other so you can see the colored wires inside the ends.
Examine the sequence of colored wires to determine the type of RJ-45 cable, as follows:
Below is a diagram comparing a straight-through versus a cross-over cable.
The following 3 tables show the various pin-outs for each of the 3 major types of RJ-45 cables.
Other Cabling Types
In addition to Ethernet, RJ-45 cable is also used for WAN connections. The diagram below shows some other types of crossover cables and compares them to Ethernet.
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Last modified: June 26 2011.