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.
See also
References
