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The particular switch concerned here is a Three-Stage Time-space-time (TST) interconnection network and performs the time-division circuit switching. The input and output stages are Time Slot Interchangers (TSI). The central stage is a time-multiplexed switch with two ports per address. By exploiting the channel grouping at the central stage as well as reducing the average loading at each internal frame,the three-stage multicast switch has potential to remove almost all slot contention blockings.