The main difference between straight through and crossover cables is the use of the hub. The installation process for straight through wiring and cross over wiring is almost identical; the only difference is where you connect the wires to the pins. You would only need to use the crossover wiring technique if you are attempting to connect two devices together directly without a hub or several hubs together.
If you are using straight through wiring you will connect the wires to same pins on both ends of the plug. For example wire one would go to pin one on both ends of the application. The difference between straight through and crossover wiring here is that you could not connected two computers using the straight through method.
The only time you will generally use a crossover connection is when you are attempting to connect two Ethernet computers or two or more hubs together. The difference between straight through and crossover wiring is a crossover patch crosses the transmit and receive pairs. The easiest way to wire a cross over patch is to wire one end of the application in the T568A standard and the other side in the T568B standard.
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