Reducing crosstalk in binary tree select 1 from N switching networks

Switching networks of the n-stage binary tree select 1 from N=2ⁿ type are employed in many types of telecommunications switching systems. It is shown that it is possible to eliminate crosstalk, due to imperfections in their ´crosspoint´ devices, of order m and lower by adding a minimum of m switching stages and by employing control codes with a minimum Hamming distance of (m+1).