These two standards are part of the 100BaseX family, which is known as fast Ethernet. The different fast Ethernet flavors run at 100 Mbps, us3 a star topology, use CSMA/CD as an access method, but differ in the type of cabling used. 100BaseTX uses two pairs (four wires) in the CAT 5 cabling, whereas 100BaseFX uses strands of fiber instead of twisted - pair cabling.
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