Before revision: For instance, 100BASE-TX encodes data using differential voltage levels ( -1 V, 0 V, or + 1 V ), and 1000BASE-T encodes data using five differential voltage levels (− 2 V , − 1 V, 0 V , + 1 V, and + 2 V ).
After revision: For instance, 100BASE-TX encodes data using differential voltage levels ( -1V, 0V, + 1V ), and 1000BASE-T encodes data using five differential voltage levels (− 2V , − 1V, 0V , + 1V, + 2V ).