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ACM Computing Surveys (CSUR)
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GROUP '99 Proceedings of the international ACM SIGGROUP conference on Supporting group work
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ACM SIGMOD Record
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The hub-and-spoke architecture of a star network dates to the telecommunications central switching office. However, its benefits are only beginning to be explored in network-centric global applications. The hub facilitates interaction between dissimilar and distant systems. It serves multiple roles: translator between communication formats; subscription manager; multi-level data access controller; and data repository. A network application has expectations of latency. Network-centric application developers need to understand the underlying performance of the spokes used to communicate with the hub. This understanding becomes more difficult when commercial spokes are used. This paper describes the requirements for a hub that performs global networking, the implementation efforts to date, and the plans for future work. It addresses the methods used to gain insight into the performance of spokes when they are implemented by commercial network services. Results are presented for an example spoke technology, the Iridium satellite network.