Realization of Non-Power-of-Two Distributors

Jeong Gyu LEE
Byeong Gi LEE

IEICE TRANSACTIONS on Communications   Vol.E83-B    No.5    pp.1106-1114
Publication Date: 2000/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Switching
ATM switch,  packet concentrator,  packet distributor,  

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This paper considers how to construct non-power-of-two distributors, which concentrate and rotate, simultaneously, active input packets for an efficient buffer utilization in packet switching environment. As a theoretical background, we first establish that an R R distributor cannot be constructed out of a conventional N N distributor for a non-power-of-two number R in N/2 < R < N(=2n), due to internal packet conflicts. We then consider how to resolve the internal packet conflict problem to construct a non-power-of-two distributor out of the nearest power-of-two distributor and introduce a number of possible arrangements. Especially, we present a single-CSE (Controlled Switching Element)-RBN (Reverse Banyan Network) based realization which helps to eliminate the dummy address calculation and generation operations that used to be required in the conventional RBN based distributors. Further, we extend the single-CSE-RBN based distributor to generate two flexible-size distributor structures--flexible R R and N R distributors--which can respectively perform the R R and N R distribution functions for an arbitrary number R N simply by changing the CSE parameter setting.