The Free On-line Dictionary of Computing (30 December 2018):
100BaseTAny 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. (1997-01-07)