Abstract: A time slot association arrangement for a high quality connection in a time multiplex system. An input time slot reserved for high quality lines is associated with an output time slot. Samples written in the "In" slot are read during the "Out" slots in the order in which they were entered. The quality slots are detected and the reference code is incremented by one on an "Out" slot, and the code on an "In" slot is decreased by one. As the next step, the output slot providing maximum results is identified and associated with the input time slots following the maximum result output slot.