Leading you to an educated decision.
100 Mbps baseband Fast Ethernet specification using UTP wiring (Category 5 or better). Like the 10BASE-T technology on which it is based, 100BASE-TX sends link pulses over the network segment when no traffic is present. However, these link pulses contain more information than those used in 10BASE-T. The 100BASE-TX specification is based on the IEEE 802.3u Fast Ethernet standard.