Combined Input-Crosspoint Bufiered Packet Switch with Shared Crosspoint Bufiers 1
Roberto Rojas‐Cessa, Ziqian Dong · 2005
The amount of memory in bufiered crossbars in combined input-crosspoint bufiered switches is proportional to the number of crosspoints, or O(N 2 ), where N is the number of ports, and to the crosspoint bufier size, which is deflned by the dis- tance between the line cards and the bufiered cross- bar, to achieve 100% throughput under high-speed data ∞ows. A long distance between these two com- ponents can make a bufiered crossbar costly to imple- ment. In this paper, we propose a combined input- shared-crosspoint bufiered packet switch that uses small crosspoint bufiers to support long round-trip times, which consider the distance between the line card and the bufiered crossbar. The proposed switch reduces the required bufier memory of the bufiered crossbar by 50% or more, and uses no speedup.