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Any of several Fast Ethernet 100 MBps CSMA/CD standards for twisted pair cables, including: 100BaseTx (100 Mbps over two-pair Cat5 or better cable), 100BaseT4 (100 Mbps over four-pair Cat3 or better cable), 100BaseT2 (in committee; 100 Mbps over two-pair Cat3 or better cable). All are standards (or planned standards) under IEEE 802.3.
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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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Network line increased from lOBaseT to 100BaseT for faster internal file transfer.
You wouldn't manage your 10BaseT network separately from your 100BaseT network, so why should this be any different for wireless technologies?
One example is Computer Associates International's use of VI in its ARCserve 2000 Workgroup/Advanced Edition Backup Agent for Microsoft SQL Server, doubling performance over its 100BaseT Ethernet offering.
Vinca claims 100% performance increases using GigaNet's GNN1000 cLAN Host Adapter using standard drivers, compared with 100BaseT Ethernet.
A small box enclosure contains a microSPARCII processor, memory (from 8MB to 64MB), Flash RAM (up to 8MB) and networking interfaces (10BaseT or 100BaseT).
"It has the ability to virtually concatenate (VC) two STS-1 payloads into a single payload that can carry a 100BaseT Ethernet (fast Ethernet) connection with a DS3 available for delivery or to be used with an M13 for T1 fan out.
The maximum data transfer rate using 100BaseT is about l00Mbit/sec.
The GPIB-ENET/100 controller enables users to access remote test equipment from anywhere via TCP/IP protocols on 10BaseT and 100BaseT networks while the PCI-8212 interface product offers a single PCI board combining National's own GPIB controller chip and an Ethernet controller chip developed by Intel.