the standard only uses 2 pairs. the other two pairs (4 strands all together, which are white brown/brown and white blue/blue) are not used.
depending on which standard you decide to use, the color of the pairs vary. the two standard are 568a and 568b.
the pairs that are in the 1 and 2 spots in the cat5 connector are the negative send strand, and the other is the positive send strand.
the pairs that are in the 3 and 6 spots in the cat 5 connector are the negative receive strand and the other is the positive receive strand.
this is why you use a crossover cable to connect like devices. if you notice the difference between the two ends you see one end comes from the send pair on pins 1 and 2 and on the other end of the cable it goes into the 3 and 6 position for receive on the other device.
for example, on a 568b connector the send pairs are white orange and orange. in a crossover cable, the other end will be a 568a connector, and the white orange and orange pairs will go into the 3 and 6 pin positions. from the 568a to the 568b it uses the white green and green pairs.
of course, in a straight thru, the positions are the same on both ends and are used to feed equipment that is different from each other.
but to answer the question, yes, it only uses the white orange/orange and the white green/green pairs.
you dont need to modify patch cords at all, to connect computers to the jack simply use a straight thru cable, a cable that the order of the pairs inside the jack are the same on both ends (either 568a on both, or 568b on both, it does not matter which u choose). the standard was designed so you dont have to worry about that!
