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A growable packet (ATM) switch architecture: design principles and application

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3 Author(s)
Eng, K.Y. ; AT&T Bell Lab., Holmdel, NJ, USA ; Karol, M.J. ; Yeh, Y.-S.

The problem of designing a large high-performance, broadband packet of ATM (asynchronous transfer mode) switch is discussed. Ways to construct arbitrarily large switches out of modest-size packet switches without sacrificing overall delay/throughput performance are presented. A growable switch architecture is presented that is based on three key principles: a generalized knockout principle exploits the statistical behaviour of packet arrivals and thereby reduces the interconnect complexity, output queuing yields the best possible delay/throughput performance, and distributed intelligence in routing packets through the interconnect fabric eliminates internal path conflicts. Features of the architecture include the guarantee of first-in-first-out packet sequence, broadcast and multicast capabilities, and compatibility with variable-length packets, which avoids the need for packet-size standardization. As a broadband ISDN example, a 2048×2048 configuration with building blocks of 42×16 packet switch modules and 128×128 interconnect modules, both of which fall within existing hardware capabilities, is presented

Published in:

Communications, IEEE Transactions on  (Volume:40 ,  Issue: 2 )

Date of Publication:

Feb 1992

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