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Author Topic: Starlink (LEO Satellite Link)  (Read 2360 times)

Alex Atkin UK

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Re: Starlink (LEO Satellite Link)
« Reply #45 on: July 13, 2021, 06:11:59 PM »

So starlink is a custom openwrt build: https://github.com/SpaceExplorationTechnologies/starlink-wifi

Not that surprising I guess, a LOT of router OS seem to be custom OpenWRT, not all of them obeying the GPL.
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jelv

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kitz

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Re: Starlink (LEO Satellite Link)
« Reply #47 on: July 19, 2021, 11:35:57 AM »

Quote
On latency, it’s worth noting that Elon Musk has long spoken of Starlink as being intended to deliver an average latency time of around 20ms. Clearly, not everybody is getting that right now, although some of this may be due to people testing over WiFi and any latency being added by Ookla’s testing platform. However, Musk recently pledged that ping times would “improve dramatically in the coming months … we’re aiming for <20ms.”


I'm impressed if they can get latency down to <20ms.   
There was me thinking satellite latency traditionally ran into the multiple hundreds of ms.
I wonder about redundancy and its effects.
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kitz

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Re: Starlink (LEO Satellite Link)
« Reply #48 on: July 19, 2021, 11:47:52 AM »

Just did a bit of googling.

There's what appears to be a decent explanation here: Wonder how SpaceX’s StarLink can achieve record low latency?

Quote
New York -> London

43ms Starlink
55ms Optical Fibre


There's also an engineering based video discussing Starlink

https://www.youtube.com/watch?v=giQ8xEWjnBs

small snippet of some transcript from the vid

Quote
These lasers, like our fibre optic cables here on earth, will use light pulses to transmit information between satellites.   Transmitting with light in space offers one massive advantage over transmitting with light on earth.  The speed of light is not constant in every material, in fact, light travels 47% slower in glass than in a vacuum.   This offers Starlink one huge advantage that will likely be its primary money maker.  It provides the potential of lower latency information over long distance
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kitz

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Re: Starlink (LEO Satellite Link)
« Reply #49 on: July 19, 2021, 12:09:45 PM »

AAISP latency graph for their 2 customers using their L2TP service over Starlink, averaging 40-50ms



More info: L2TP Starlink


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jelv

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Re: Starlink (LEO Satellite Link)
« Reply #50 on: July 19, 2021, 03:27:16 PM »

We'd discussed latency on Starlink before - it all comes down to basic physics!

If you had read the article I linked you'd know this was a fact, not a claim.

All satellites up until now have been orbiting at a height of around 20,000 miles. Receiver to satellite, and back to ground station, then back again with the reply is 4x20,000 miles which at the speed of light takes 430 milliseconds before you take anything else in to account. Starlink are low earth orbit satellites at a height of around 300 miles (that's why they need so many to provide continuous service as each one quickly disappears over the horizon), which adds 6ms.

It wouldn't surprise me if for Weaver the latency on Starlink was better than he gets now.

Edit: There's posts in that topic that perhaps should be merged in to this one?
« Last Edit: July 19, 2021, 03:30:59 PM by jelv »
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Alex Atkin UK

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Re: Starlink (LEO Satellite Link)
« Reply #51 on: July 19, 2021, 06:40:36 PM »

Very impressive indeed, seems about as consistent as 4G.
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kitz

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Re: Starlink (LEO Satellite Link)
« Reply #52 on: July 19, 2021, 08:53:13 PM »

We'd discussed latency on Starlink before - it all comes down to basic physics!

Edit: There's posts in that topic that perhaps should be merged in to this one?

Yes there is, but having just looked not sure if it would tend to break things up in the other thread too much. :(
 
I'd already pondered this morning, whether it may be an idea to move this thread over to the broadband technology section and to try and keep any talk about the technology to this thread.     I must have missed the earlier discussion about the latency, so I was really surprised when I saw just how low it was...  so of course I then started thinking how.
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