BASE-TX
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:
| 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
This article was originally based on material from the Free On-line Dictionary of Computing and is used under the GFDL.
Categories: Ethernet