 Crosspoints being more expensive in the new system but switches cheaper, system cost was minimized with fewer crosspoints organized into more switches.The fabric was divided into "Line Networks" and "Trunk Networks" of four stages, and partially folded to allow connecting line-to-line or trunk-to-trunk without exceeding eight stages of switching.The traditional implementation of a nonblocking minimal spanning switch able to connect formula_1 input customers to formula_1 output customers simultaneously—with the connections initiated in any order—the connection matrix scaled on formula_3.