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Reports Year : 1999

On Arbitrary Waksman Networks and their Vulnerability


Motivated by problems in telecommunication satellites, we investigate rearrangeable permutation networks made of binary switches. A simple counting argument shows that the number of switches necessary to build a $n \times n$ rearrangeable network (i.e. capable of realizing all one-to-one mappings of its $n$ inputs to its $n$ outputs) is at least $\psln! = n\log_2{n} - n\log_2{e} + o(n)$ as $n\rightarrow\infty$. For $n = 2^r$, the $r$-dimension- al Bene\vs network gives a solution using $n\log_2{n} - \frac{n}{2}$ switches. Waksman, and independently Goldstein and Leibholz, improved these networks using $n\log_2{n}-n+1$ switches. We provide an extension of this result to arbitrary values of~$n$, using $\slog{i}{n}$ switches. The routing algorithm used in Bene\v{s} networks is also generalized for arbitrary values of~$n$. Finally the fault-tolerance issue of these networks is discussed.
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inria-00072871 , version 1 (24-05-2006)


  • HAL Id : inria-00072871 , version 1


Bruno Beauquier, Eric Darrot. On Arbitrary Waksman Networks and their Vulnerability. RR-3788, INRIA. 1999. ⟨inria-00072871⟩
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