100BASE-TX runs over two pairs of wires in category 5 cable. Like 10BASE-T, the proper pairs are the orange and green pairs (canonical second and third pairs) in the TIA-568B wiring standard.
In TIA-568B, wires are in the order 1, 2, 3, 6, 5, 4, 7, 8 on the modular jack on each end. The colour-order would be orange/white, orange, green/white, blue, blue/white, green, brown/white, brown:
25 Pair Color Code Chart
RJ-45 Wiring (EIA/TIA-568B)
Pin
Pair
Wire
Color
1
2
1
white/orange
2
2
2
orange/white
3
3
1
white/green
4
1
2
blue/white
5
1
1
white/blue
6
3
2
green/white
7
4
1
white/brown
8
4
2
brown/white
Each segment can have a maximum distance of 100 metres. Capable of 100 Mbit/s throughput (200 Mbit/s in full-duplex configurations). See IEEE 802.3 for more details.
The configuration of 100BASE-TX networks is very similar to 10BASE-T. When used to build a local area network, the devices on the network (computers, printers etc.) are typically connected to a hub or switch, creating a star network. Alternatively it is possible to connect two devices directly using a cross-over cable.
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Models are available for direct connection to 100BaseTXRJ-45 and 100BaseFX fiber optic Fast Ethernet devices in a choice of connector and fiber optic cable types.
When connecting two hubs or two 10BaseT (or 100BaseTX) devices without a hub, the transmit data (TD) pins of one eight-pin connector must be wired to the receive data (RD) pins of the other, and vice versa.
Note that the TD and RD signals on each pair of a 10BaseTsegment are polarized, with one wire of each signal pair carrying the positive (+) signal, and the other carrying the negative (-) signal.
If you need a longer cable, or a Category 5 cable for 100BaseTX, you should be able to purchase one from any computer reseller familiar with networking.
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