An ATM telecommunications switch comprises a plurality of parallel data switching planes and a parallel control plane, each plane having an equal number of input ports and outport ports and a central switching unit to switch each input port to any outport port and includes means to divide a single data stream between a plurality of input ports and means to concatenate the data from a plurality of outport ports to reconstitute the data stream. The switch further comprises rotator means to connect each input port cyclically to each timeslot of the central switching unit and second rotator means to connect each timeslot of the central switching unit cyclically to each output port. <IMAGE>
