Also found in: Dictionary, Thesaurus, Medical.


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 ?
It automatically negotiates the Ethernet speed (10Base-T or 100Base-T) as well as to choose between full- and half-duplex operations.
The self-contained instrument includes a shock-mounted 40-Gb hard disk, a backup NiMh battery, and a 100Base-T Ethernet PC link.
In addition to all expected PC features, such as SVGA and disk controllers, the new model also includes digital I/O, analog-to-digital converters, digital-to-analog converters, and Ethernet support for both 10BASE-T and 100BASE-T. With 64MB of RAM, up to 128MB flash, and full AT-compatibility, high performance, cost-efficient control systems can be developed as single board solutions.
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.
In addition to PC-compatible features such as SVGA (CRT and LVDS panel support), dual USB ports, and dual serial ports, the new model also includes 100BASE-T Ethernet support.