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Delay/Disruption Tolerant Networking (DTN) "Bundles" have been proposed for deep-space communication in the "Interplanetary Internet." This paper describes the first DTN bundle protocol testing from space, using the United Kingdom Disaster Monitoring Constellation (UK-DMC) satellite in Low Earth Orbit (LEO). The mismatch problems between the different conditions of the private dedicated space-to-ground link and the shared, congested, ground-to-ground links are discussed. DTN, with its ability to transfer files on a hop-by-hop basis across different subnets, is presented as a technology that can be used to alleviate this problem.
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