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We report on the construction of a 1024 node switching network using IEEE 1355 DS link
technology. The nodes are interconnected by a switching fabric based on the STC104 packet
switch. The system has been designed and constructed in a modular way in order to allow a
variety of different network topologies to be investigated. Network throughput and latency
have been studied for different topologies under various traffic conditions including those
expected within the second level trigger of the ATLAS experiment. Initial experience using 1
Gbaud IEEE 1355 HS links and switches is also presented.
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