Packet Switching (basics) Crossbar scheduling: Take-a-ticket HOL Probability

Packet Switching (basics) Crossbar scheduling: Take-a-ticket  HOL Probability

Packet Switching (basics) Crossbar scheduling: Take-a-ticket

HOL Probability that none of the N input ports

chooses a given output port is (1-1/N) N 37% So, max throughput of this switch is: 63%

Avoid HOL-blocking with multiple input queues (one per output port)

PIM: Parallel Iterative Matching

iSLIP (avoids randomization of PIM) iSLIP (cont)

Multistage switching

Blocking vs non-blocking switching networks

Blocking vs non-blocking switching networks

Clos network (N, n, k): Non-blocking if k 2n-1 (Prove this!)

Clos network (N,n,k=2n-1): Prove that min number of crosspoints = 5.6NN (for n= (N/2)

Banyan networks and

the self-routing property

Benes network

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