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The Lira system (Russian: Лира) is a two-way communication system used between the International Space Station and Mission Control via the Russian Luch relay satellite constellation, also known as Altair. The ROS (Russian Orbital Segment) communication Subsystems can receive commands directly from ground stations through the Regul Subsystem and can receive commands from the LUCH satellite through the Lira or the Regul System.
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