CAT 6 UTP cabling usually uses only four wires when sending and receiving information on the network. The four wires, which are used, are wires 1, 2, 3, and 6. When you configure the wire for the same pin at either end of the cable, this is known as a straight-through cable.
From the figure we can see that the wires 1 and 2 are used to transmit the data from the computer and 3 and 6 are used to receive data on the computer. The transmit wire on the computer matches with the receive wire on the switch. For the transmission of data to take place, the transmit pins on the computer should match with the receive pins on the switch and the transmit pins on the switch should match to receive pins on the computer. Here we can see that the pins 1, 2, 3 and 6 on the computer matches with pins 1, 2, 3 and 6 on the switch. Hence we use the term Straight-through.
Following image shows the wire/pin positions of a Straight-through Unshielded Twisted Pair cable, using TIA/EIA 568A standard.
Note that the white striped wires are used to connect positive pins and solid color wires are used to connect negetive pins.
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