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An Ethernet standard that transmits at 100 Mbps. Introduced in 1995 and officially the IEEE 802.3u standard, it is a 100 Mbps version of 10Base-T (10 Mbps Ethernet). 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 at least 10/100, supporting both 100Base-T and 10Base-T (see 10/100 adapter).

100Base-T, 100Base-T4 and 100Base-TX
100Base-T uses two pairs of wires in Category 5 UTP cable, while 100Base-TX requires two pairs in Category 6 cable. 100Base-T4 uses all four wire pairs in older Category 3 cables. See 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
The moniker "Fast Ethernet" has been used for 100Base-T since its inception. In 2013, this was a current product in Staples.
References in periodicals archive ?
Combined synopsis/solicitation:cisco gbic modules & aruba sfp-ts 100bt
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.