SpaceX Viasat THROWDOWN on Latency Reveals REAL Starlink Latency under load and Testing Plans



SpaceX has just revealed details on latency and throughput testing in response to Viasat in their FCC filing, including how they are testing for large scale usage right now as part of the Private Beta.

References:
Full Mirror: https://github.com/mikeonspace/research
Modification Request: https://github.com/mikeonspace/research/tree/master/Starlink/FCC/SAT-MOD-20200417-00037
Viasat Comment: https://github.com/mikeonspace/research/blob/master/Starlink/FCC/SAT-MOD-20200417-00037/2714404.pdf
SpaceX Response: https://github.com/mikeonspace/research/blob/master/Starlink/FCC/SAT-MOD-20200417-00037/2729898.pdf

Sections
0:00 Introduction
X:XX Review of SpaceX Modification Requests
X:XX Who is Objecting
X:XX SpaceX Latency and Load Testing
X:XX Closing

#Starlink #SpaceX #Latency .

41 comments
  1. No idea why Viasat is so butthurt of SpaceX when they're not willing to provide good internet to rural areas. Every time I call them about the service being down they seem to act like I am indebted to them when I pay them $170 a month for 30Mbps with a 100gb allowance.

  2. it will be nice to have better latency, but I'm just tired of data caps. oh sure I can stream in 720p with viasat but it burns up my data so fast that I end up watching at 240p most of the time just to stretch my 10G of data out. once it's used up I'm down to 144p with buffering.

  3. You need to define "frame" and "cell" for this application. Otherwise, we don't know what you are talking about, as those are not universal terms.

  4. @9:12 this does not affect throughput as that is determined by the bandwidth of the rf channel. It affects latency as each terminal receives all of the data on the channel and has to wait on the frame containing it's packets, then wait for the other terminal packets before being able to read it's packet. The RF channel is shared between hundreds of terminals. The satellite has multiple beam antennas in a giant grid on a giant panel so that each antenna only covers a tiny region on the ground to allow the reuse of the same frequencies in regions of land that are far away allowing more terminals to use the system, similar to how cellular phones work. Different antennas in the grid could be polarized differently (this is EE speak for the angle of the antenna, antennas that are 90 degrees rotated from each other suffer a 50% signal loss and this is used so that adjacent cells can be packed together and reject each other's signal. You also have circular polarization in which the antenna looks like a rectangular corkscrew). Frame is EE speak for the low level grouping of digital bytes in a digital signal typically having a frame header with a crc and more. Packets are a higher level grouping. In network lingo, a frame contains one or more packets and has raw hardware addresses and a packet has network addresses.

  5. Hugesnet has had a monopoly on satellite internet for a while. They are fighting so they won't have to actually upgrade their service and spend money on new satellites.

  6. That's funny. When I had Charter a few years back , I was seeing upwards of 1000-2000ms pings and couldn't watch a 3Mb/s youtube video. How does that classify as broadband?

  7. What I do not understand yet: with a satellite antenna I can receive something, but with what do I send?
    Earlier systems needed a return channel. How does this work with Starlink?
    And if Tesla uses Starlink, how does it work?

  8. But how do I start using it?!
    Yes, I know it's in beta. But how do I start using it?
    I only have access to cellular or satelite internet. And this looks to be the best option

  9. Been using exede/ viasat for 4 years because I had no other option. I pay $130.00 a month and at time have less than 58kbs for over 3/4 a month. Sucked when I got it but turned to total crap after net neutrality was destroyed and been getting raped ever since.

  10. We live 12 minutes from the county seat and we have none -0- nada Internet.
    We can get just enough to get e-mail through our phone and as that is it.
    Even via stat wouldn't offer service said their transponders in this area were overloaded.
    In my previous location I was raped by Comcast for 12 years.
    I hope Elon puts them all out of business.

  11. lets make some new. lets still use same network,but route traffic space it go around world and come down back old network connect google.com.then data go back same way.all this faster

  12. The promised us low latency world-wide.
    Meaning if I connect to a server in Taiwan, from the EU, I would still get low latency.
    This was their wording, and I called bs on it right away. Now they're trying to BS their way out of it by only testing latency to the city they are currently in.

  13. It will not be the best option for cities but will be great for villages and 3rd world countries where no one wants to invest because it just not a good deal for ISP companies

  14. With Viasat It takes me a half hour to download a 10 minute YouTube video at 720p. Horrible speed, with horrible latency, and they were still better than Hughes Net when I switched. I'm setting here one month and one week after my Viasat contract ended, waiting for Starlink to agree to take my money.

  15. viasat will lose customers that is the only reason there mad at all this if SpaceX dose not have a business plan where business can have stack ips then they will not get the business customers like me in the. Middle of nowhere

  16. The other satellite internet providers getting nervous good to see makes me hopeful this will change a lot for the better so spaceX can get funding for the future

  17. There's going to be so much radiation beamed towards the ground that we'll have to moved to Mars. Wait what …

    The earths magnetic field protects us from radiation, so we build satellites inside that field to beam radiation at ourselves. Awesome.

  18. Viasat sucks. Their capabilities aren’t terrible bit their business practices are. There is also no way they could compete with the SpaceX latency and technology

  19. So 30ms in one cell. Newer will it go lower. It can only multiply by number of cells required. Well, I guess it is enough for smart watches but no serious latency dependent applications.

  20. So I live in a rural aria and had viasat. Paid 330 a month for 100mb "unlimited". It was absolutely unusable ping was over 1k and best speed I ever saw was 25mb a second.

  21. There's another issue that is actually in Viasat's favor. With a Geostationary satellite, you just need a clear line of sight to the satellite. But a LEO earth station needs to have a clear view of a fairly large portion of the sky to always see a satellite so that it can hand-over from one satellite to another. A ground station will have to have beam-steering antennas, and not a simple dish.

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