size under diagonal and hotspot distributions, but the delay
increases slowly with the switch size under asymmetric distribution.
When the switch is heavily loaded, the delay
increases slowly with the switch size under asymmetric distribution.
Interestingly, under the diagonal distribution, the
delay decreases as the switch size increases, but the slope
becomes smaller and smaller. Under the hotspot distribution,
the delay also increases with the switch size, and the
trend is faster than the situation under asymmetric distribution.
However, the slope is decreasing as the switch size
increases. Thus, to some point, the delay will become not so
sensitive to the switch size. During all the simulations, the
delay is always smaller than 25 time slots when the load is
as high as 90 percent.
Fig. 16 shows the comparison of the maximum queue
lengths in a TSBCS/BS switch and that in an OQ switch
under Bernoulli non-uniform traffic. The queue lengths of
VOMQ, OQ and the total queue length of the TSBCS/BS
switch are measured. The total queue length is the total
number of cells in TSBCS/BS in any stages. As the results
illustrate, the total number of cells in the TSBCS/BS switch
is no more than twice of the OQ switch.