"Classic Ethernet" typically refers to the original implementations and common standards that evolved from the early days of Ethernet up to the widespread adoption of Gigabit Ethernet.- Original Ethernet (10BASE-T) Operated at 10 Mbps. - Fast Ethernet (100BASE-TX) Operated at 100 Mbps. - Gigabit Ethernet (1000BASE-T) Operates at 1000 Mbps (1 Gbps).While very early forms might have been lower, and modern Ethernet can go much higher (10 Gbps, 40 Gbps, 100 Gbps and beyond), the range that is commonly associated with "classic" Ethernet, encompassing the evolution from 10 Mbps to Gigabit speeds, is 10 to 1000 Mbps.