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CONT: The Inter-Orbit Communication (IOC) instrument is a technological experiment designed to provide a pre-operational inflight test and demonstration of the main functions, services and equipment typical of those required for a data relay system, namely: bi-directional, end-to-end data transmission between the user spacecraft and a dedicated ground station via a relay satellite in the 20/30 GHz frequency band; tracking of a data relay satellite; tracking of a user spacecraft; ranging services for orbit determination of a user spacecraft via a relay satellite.