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To achieve this kind of speed, you need at least around 600kbps at the barest minimum for TCP ACK packets (~50 bytes), assuming that downstream packets are full-frame 1500 bytes.

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The tweet's 17 Mb/s is UDP down from satellite, so no ack replies from the phone, and 15% packet loss.

So it really doesn't say anything about upload speed.

That’s not really true since one ACK packet can acknowledge multiple RXed data packets.

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