What is the maximum segment length of a 100Base-FX network,The last character ('X', etc) refers to the line code method used. Line code is a pattern of voltage, current or photons used to represent the digital data transmitted on the transmission line. Fast Ethernet cable is sometimes referred to as 100BaseX where X can be replaced by two variants i.e. FX and TX.In most of the Fast Ethernet applications, the individual devices are connected by twisted-pair copper wires i.e. 100BaseTX(maximum segment length is only 100 meters) and the optical fibers are used for transmission over longer distances(as maximum segment length is 2000 meters of 100baseFX). So, 100baseTX to 100Base FX convertor is required for sending the signal from the sender end over the optical fiber. Similarly, at the receiver end, 100baseFX to 100Base TX is required.