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An earth terminal transmits data up to the satellite. The satellite can then either shoot it right back down in its footprint to another earth station where the data was meant to go. It can relay it directly to any amount of other satellites and then down to the other earth terminal you were wanting to talk to. Or it can go up to the satellite, back down to another terminal, up to another satellite, and then down to where you wanted to "talk" to.

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Q: How does SATCOM work?
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