Abstract
The Eventbuilder of the ZEUS experiment is a real-time parallel data formatting and transport system. It combines data flows originating from various detector components and transfers them to the third level trigger processor farm. The Event builder is based on an asynchronous packet-switching transputer network and uses transputer links for bulk data transfer. A high-speed 64 × 64 custom made crossbar switch allows dynamic linking of any detector component to any branch of third level processor nodes, offering a bandwidth of more than 24 MB/s over a distance of 100 m. The use of structured system development techniques (SA/SD) resulted in a flexible and well-partitioned system structure and guaranteed that all requirements were met.
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