Abstract: In a data packet transmission system, a disturbing delay is produced for the speech channels during the transformation of the data packets into a regular multiplex. A transformation arrangement permitting to minimize this delay is comprised of a storage unit 1 in which the data are stored, for example, in the form of multi-frames, reading this memory being effected in a different sequence, packet-by-packet, by addressing means 4 in accordance with predetermined addressing rules for the reconstruction of a standard multiplex. Such an arrangement is advantageously used when data packets are transmitted at different rate speeds.