A crossover cable is a cable that you can use to directly connect two devices without a switch. You can use a crossover cable to connect two computers directly to each other, but crossover cables are more often used to daisy-chain hubs and switches to each other.
If you want to create your own crossover cable, you have to reverse the wires on one end of the cable, as described in the following table. This table shows how you should wire both ends of the cable to create a crossover cable. Connect one of the ends according to the Connector A column and the other according to the Connector B column.
| Pin | Connector A | Connector B |
|---|---|---|
| Pin 1 | White/green | White/orange |
| Pin 2 | Green | Orange |
| Pin 3 | White/orange | White/green |
| Pin 4 | Blue | Blue |
| Pin 5 | White/blue | White/blue |
| Pin 6 | Orange | Green |
| Pin 7 | White/brown | White/brown |
| Pin 8 | Brown | Brown |
You don’t need to use a crossover cable if one of the switches or hubs that you want to connect has a crossover port, usually labeled Uplink. If the switch has an Uplink port, you can daisy-chain it by using a normal network cable.
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Source:http://www.dummies.com/how-to/content/network-building-crossover-cable.html
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