https://www.ispreview.co.uk/index.php/2020/09/analyst-probes-speed-claims-of-starlinks-broadband-satellites.html https://www.ispreview.co.uk/index.php/2020/09/a

https://www.ispreview.co.uk/index.php/2020/09/analyst-probes-speed-claims-of-starlinks-broadband-satellites.html https://www.ispreview.co.uk/index.php/2020/09/analyst-probes... has the 20gbps (I've seen it in other places too). I actually think it could be considerably less than that in reality, as that's probably the raw link speed. I don't know the modulation techinque that starlink uses, but I imagine some level of Forward error correction (5/6 seems common in other sat systems I've read about), which drops throughput by ~20%, plus other modulation overheads. I wouldn't be surprised if the actual real world speed per sat is half the max, possibly a lot worse in bad weather. I don't think uplink is a problem. Even 2TBit/sec of internet capacity is cheap (especially compared to satelite launches) so I imagine this is a rounding error in the costs. I'm sure they have thought about the uplink spectrum requirements. The above article mentions they think that starlink could serve 1.5million US customers when the full (12k) constellation is deployed.