This indicates the supported speeds for the port. The value is a sum. This sum initially takes the value zero. Then, for each speed, S, that the port supports, 2 raised to (S - 1) is added to the sum. For example, a port that supports 10 Mb (S = 1) and 100 Mb (S = 2) would return a value of 3 ((2 ^ (1 - 1)) + (2 ^ (2 - 1))). Speed values should be calculated as follows: S Speed Description 1 10 Mb Ethernet 2 100 Mb Fast Ethernet 3 1000 Mb Gigabit Ethernet