Initially, several Fast Ethernet standards for were standardized, including: 100BASE-TX (100 Mbit/s over two-pair or better cable), 100BASE-T4 (100 Mbit/s over four-pair or better cable, defunct), 100BASE-T2 (100 Mbit/s over two-pair Cat3 or better cable, also defunct). The segment length for a Ethernet over twisted-pair link is limited to 100 metres (328 ft), the same limit as and.