Abstract

: Lookup tables are used extensively in communication networks in such areas as multiplexing, switching, routing and re-assembly. Tables used for ATM switching and multiplexing are of particular importance because of the size and speed they require to support a large cell label and cell transfer at near gigabit speeds. In this paper we present two new lookup table architectures and compare them to conventional techniques for implementing ATM switching tables. 1. INTRODUCTION The chosen technology for integrating communication services is the Asynchronous Transfer Mode (ATM) [3]. ATM networks transfer information in 53 octet cells identified by label: a 16 bit Virtual Channel Identifier (VCI) and a Virtual Path Identifier (VPI) of 8 or 12 bits. Switching lookup tables are used within ATM switches to control cell switching and multiplexing. Essentially, lookup tables map input numbers onto output numbers, and those input numbers that have table entries are known as keys. ATM switching t...

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