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100BASE-FX is a version fast Ethernet over fiber optic . Use two strands of multi-mode optical fiber for reception and transmission. Also known as fiber-optic version of 100BASE-TX . The maximum length is 400 meters to connections half-duplex (to ensure that collisions are detected) or 2 miles to full-duplex . 100BASE-FX supports 10BASE-FL , version 10-Mbit / s over fiber. Uses a wavelength of near infrared light at 1.3 microns
.100 BASE-TX standard is most common in this type is 100BaseTX Ethernet, and is supported by the majority of Ethernet hardware that occurs today. Uses 2
twisted copper pairs of category 5 or higher (a Category 5 cable contains 4 pairs, so it can support 2 100BASE-TX links). In a typical configuration
100Base-TX uses a twisted pair cables each direction ( full-duplex ). (See IEEE 802.3 for more details)
The configuration of a 100Base-TX is very similar to a 10Base-T type. When we use this standard to create a local area network, the network components (computers, printers, etc.) are usually connected to a switch or hub, creating a network with star topology. Alternatively, you can connect two components directly using crossover cable.
[ edit] 100BASE-T4
was one of the first implementations Fast Ethernet. It requires four twisted pairs of cable, but must be of category 3 rather than category 5 which is required by TX. Of the four pairs, one pair is reserved for transmitting, one for receive, and the remaining two are control data.

100BASE-T2 standard
This data is traveling over two copper pairs, 4 bits per symbol. First, a symbol of 4 bits is extended in two 3-bit symbols each using a complicated procedure coding based on a linear feedback register (see standard for details). This is necessary to flatten the bandwidth and spectrum signal. The original bitmap representing the code is not constant in time and have a long period (one might say that more often appears random). Fiber Optic Standards

The version on fiber these estandars get a higher speed and cover more surface without repeaters. 100BASE-FX

is a version of Fast Ethernet over fiber. Uses a type of light 1300 (NIR; nm near-infrared) that is transmitted via two fiber optic lines, one for receive (RX) and one for transmit (TX).
For these cases, the maximum length is 400 meters covered for half-duplex connections (to ensure collision detection) or 2 kilometers for full-duplex over multimode fiber (compared to 100 meters over copper cable).
As for the type of encoding used, 100BASE-FX uses the same 4B5B encoding and NRZI wearing 100BASE-TX
.100 BASE-SX uses two multimode fiber optic lines to receive and transmit. This is a lower cost alternative 100BASE-FX , since it uses a shorter wavelength, which is much less expensive than long wavelength used in 100BASE-FX. 100BASE-SX can operate at distances up to 300 meters.
100BASE-SX uses the same wavelength fiber-optic version 10BASE-FL. Due to the short wavelength used (850 nm), optical components are needed less expensive (LEDs instead of lasers), which makes it an attractive option for those upgrading from 10BASE-FL and which do not require long distances. 100BASE-BX

works through a single optical fiber line (as opposed to 100BASE-FX, which uses a fiber pair.) Because we have a single line, using a multiplexer that divides the signal into two different lengths wave, one for transmit and one for receiving