Abstract: Computer networks must provide high data transfer rates to maximize the effectiveness of the interconnected equipment, and especially to maximize the effectiveness of the users, e.g., with visualization. Network speeds are increasing, with the newest systems using 800 Mbit/s data rates. The most common computer networks today are bus and ring architectures. Supercomputer networks are starting to use circuit switching with crossbar switches. Wavelength division multiplexing and all-optical networking are research topics today, but hold promise for the future. The architectures, attributes, and problems of these different systems are discussed, with emphasis on their use in the supercomputer environment. !14
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