Matrix of two-position switches

A matrix of two-position switches for transferring m input signals to the same number of outputs, the matrix being controlled so that all permutations of m incoming signals are possible at m outputs, characterized in that it includes:

• a main matrix, and
• a troubleshooting matrix which has the same number of inputs and outputs which is not less than the smaller of the numbers n and p where n is the number of inputs of the main matrix and p is the number of outputs of said main matrix, the switches of the troubleshooting matrix being adapted and controlled so that said troubleshooting matrix operates as a simple switch whose inputs consist of any pair of inputs of the troubleshooting matrix and whose two outputs consist of the two outputs of the troubleshooting matrix which have the same rank as the pair of inputs of said troubleshooting matrix,
• wherein other inputs of the troubleshooting matrix are connected to the outputs of the same rank as said other inputs of said troubleshooting matrix, and
• wherein the troubleshooting matrix includes n or p switches connected so that the first input and the first output of the switch of rank i respectively constitute the input and the output of rank i of the troubleshooting matrix,
• the second input of each switch is connected to the second output of the switch of immediately higher rank, and
• the second output of the switch of rank 1 is connected to the second input of the switch of rank n or p.