Abstmct-We propose and analyze a recursive modular arcbitecture for implementing a large-scale multiwt output buffered ATM switch (MOBAS). A multicast bmkout principle!, an extension of the generdhd knockout prieiple, is applifd in constructing the MOBAS in order to reduce the hardware complexity (e.g., the number of switch elements and intetconnedon wires) by almost one order of magnitude. In our proposed switch architecture, four major functions of designing a multicast switch: cell replication, cell routing, cell contention qmlution, and cell address@, are all performed distributhdy 80 that a large switch size is achievable. The architecture of the MOfBAS has a regular and uniform structure and, thus, has the advantages ok 1) easy expansion due to the modular structure, 2) high integration density for VLSI implementation, 3) relaxed synchronization for data and dock signals, and 4) building the cater switch fabric (i.e., the multicast grouping network) with two-stage structure of the mdtkast outpu (MOBAS) is described. The p e r f ' e cell loss probability is analyzed, and the nusrerfes1 results technology and tested to operate correctly.
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