Multistage Interconnection Networks with Multiple Outlets

Multistage Interconnection Networks(MINs) with multiple outlets are networks which can support higher bandwidth than that of nonblocking networks by passing multiple packets to the same destination. A novel MIN topology with multiple outlets called Piled Banyan Switching Fabrics (PBSF) is proposed for the Simple Serial Synchronized (SSS)-MIN used in multiprocessors, and analyzed with other two types of MIN with multiple outlets called Multi-Banyan Switching Fabrics (MBSF) and Tandem Banyan Switching Fabrics (TBSF). The throughput of these MINs is evaluated and compared with both the theoretical model and simulation. The PBSF supports the best throughput and latency used for the SSS-MIN. Although the latency of the TBSF is large, the pass-through ratio is close to 1 if the number of connected banyan networks are more than 4. Therefore, the TBSF is useful for the ATM switching networks in which the relatively large latency is tolerable. The conflict-free access of these MINs is also analyzed, and it appears that rows, column, forward and backward diagonal of the matrix can be accessed without conflict.