101001000BASET
101001000BASET refers to a specific Ethernet physical layer standard. The designation breaks down into several key components. The "10" indicates a speed of 10 megabits per second. The "100" would signify 100 megabits per second, and "1000" would signify 1 gigabit per second. The "T" at the end denotes the use of twisted-pair cabling, a common type of copper wiring used for networking.
The "BASET" part specifically refers to 1000BASE-T, which is the standard for Gigabit Ethernet over twisted-pair