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An Ethernet standard that transmits at 100 Mbps. Introduced in 1995 and officially the IEEE 802.3u standard, 100Base-T is a 100 Mbps version of the 10 Mbps 10Base-T. Like 10Base-T, 100Base-T is a shared media LAN when used with a hub (all nodes share the 100 Mbps) and 100 Mbps between each pair of nodes when used with a switch. All modern Ethernet devices are 10/100/1000, supporting 10, 100 and 1000 Mbps (10Base-T, 100Base-T and 1000Base-T) See Ethernet adapter and Gigabit Ethernet.

T, TX and T4
100Base-T uses two pairs of wires in at least Category 5 UTP cable, while 100Base-TX requires two pairs in Category 6. 100Base-T4 uses all four wire pairs in older Category 3 cables. See cable categories, 10Base-T and 100Base-FX.

"Twisted Pair" Ethernet
All stations in a 100Base-T Ethernet are wired to a central hub or switch using twisted pair wires and RJ-45 connectors.

Fast Ethernet Is No Longer Fast
The moniker "Fast Ethernet" was used for 100 Mbps 100Base-T, witness this Staples product ad in 2013. Today, Gigabit Ethernet is the norm, which is 10 times faster.
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References in periodicals archive ?
Typical TCP/IP 100BT w/Fibre Channel TCP/IP production backbone storage sharing (NFS) over Fibre Channel
Topanex 100BT benzotriazole, an ultraviolet light absorber (UVA) introduced last year by ICI Specialty Chemicals, protects plastics against discoloration and degradation.
Vanzin, new business development specialist, Polymer Additives Business, says the product "offers equal performance at reduced concentrations or superior function at equivalent levels." The company also markets Topanex 100BT, a benzotriazole targeted a styrenic and vinyl applications.