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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 ?
The self-contained instrument includes a shock-mounted 40-Gb hard disk, a backup NiMh battery, and a 100Base-T Ethernet PC link.
Ten years ago, most Ethernet installations were using 10Base-T and possibly considering upgrading to 100Base-T. (100Base-T is 10 times faster but 100% compatible with 10Base-T with an off-the-shelf 10/100 Ethernet switch.) Today, new systems are moving toward 1000Base-T, which is 10 times faster than 100Base-T but 100% compatible with both 100Base-T and 10Base-T with an off-the-shelf 10/100/1000 Ethernet switch.
Other features include the provision of eight T1 or six E1 trunk interfaces to the PSTN and media streaming over redundant 100Base-T interfaces and OC-3 interfaces.
A Model PP007 2.5-mm, 500-MHz passive probe (one per channel); 100Base-T LAN; an 8.4" color touch screen; and a CD-ROM are standard with each unit.