Ben's network is a non-blocking network. It is a different type of Clos network where initial and final stage consists of 2×2 switches (for n input and m output network it will have n/2 switches of 2 ×2 order and the final stage will have m/2 switch of 2×2 order the center stage will have two n/2 Χ m/2 switches. Numbers n and m are supposed to be the power of 2.
Therefore, for 16×16 3-phases Bens network initial phase and third phase will consist of 8 (2×2) switches and center stage will consist of 2 switches of size (8×8). The connection of crossbar will be as follows