Abstract: A signal switching system connects a plurality of parallel inputs to a plurality of parallel outputs. The inputs pass through a parallel-to-serial converter, and the resulting serial signal passes through a switching matrix. The output of the switching matrix is converted to parallel form in a serial-to-parallel converter. A flip-flop is disposed in the line between the switching matrix and the serial-to-parallel converter. The flip-flop receives and stores the output of the switching matrix, and transfers that output to the serial-to-parallel converter. The transferring occurs only when the flip-flop changes state, which is also when the switching matrix becomes rearranged. Separate but synchronized clock pulse signals control the rearrangement of the switching matrix and the switching of the flip-flop. The flip-flop isolates the switching matrix from the serial-to-parallel converter, and prevents switching transients from entering the output stream.