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Using my cell phone in a city to download lots of data very fast is common, thanks due to the dense net of base stations close to me (~1 km).

But with the space station about 400 km above ground and moving fast, how is that downlink of the live stream established exactly? I am especially interested in the HD live stream from the space station. If the communication as explained here is almost continuous, why is the live stream sometimes broken for a longer time? Does a broken live stream also mean, that a voice communication is interrupted between the astronauts and the ground station? And what bandwidth is used for the live HD stream?

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