From TheBestLinks.com
100BASE-TX is the predominant form of Fast Ethernet, providing 100 Mbit/s Ethernet.
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:
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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