How does Exede reduce latency?

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  • Updated 2 years ago
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So, I've worked with Viasat technology before and know how satellite communications work very well, I don't understand however how Exede works... I have a friend in Lake Wales FL who is telling me how his speed tests are and it makes absolutely no sense to me how someone can be running off satellite internet and actually be receiving decent ping times, be able to maintain a VoIP call and be able to play Call of Duty efficiently, any and all information pertaining to how Exedes' satellites operate, so any user manual or device manuals, or even if a rep could contact me would be appreciated. I am doing this completely for personal intellectual gain.

Best regards,


Hunter :)
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Hunter

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Posted 2 years ago

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david, Champion

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What do you mean by decent ping times? They run around 700ms.
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Hunter

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Hey David,

Well yes, that is what I am confused by, I understand the average ping time, or at least what they should be in optimal conditions, but the ping times that the client is receiving is well below that, around 150-200 (at most), which would be completely understandable if they were using like some sort of fixed wireless technology, but from what I understand they're using satellite. Like they're able to play in game as if they were playing on a DSL/Fibre Op connection, while maintaining a VoIP call and having little to no lag, which, with my experience in satellites is unheard of, and this is during peak time hours where multiple clients would be accessing the satellite connection. Now, on the older platform I did work on, there were a lot of re-transmissions due to poor signals, which caused a LOT of congestion, which in turn affected the service customers would get, causing ping times to be a lot higher than normal.

The main thing I'm curious about is #1 Where are Exede's NOCs located, #2 What is the average number of clients per beam, #3 How much bandwidth is dedicated to each beam and #4 What protocol is being used for communication between lander and orbiter and #5 What is the QoS chain (So what protocols are higher in QoS than others, preferably just the first 10 or so)?

Best regards,


Hunter


 
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Old Labs

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Much of what you're asking s proprietary so don't expect any definitive answers from ViaSat, but:


  1. There are some 19 or so gateways (or ground terminals see http://www.northlc.com/_images/beam_priority_map.png). In addition each gateway then goes through an AcceleNet server (sometimes referred to as a core node and no definitive list available but it appears one core node supports more than one gateway).

  2. No public figures available other than a total subscriber count of 696,000 as of the last quarterly financials - presumably includes Wildblue subscribers. Different plans on specific beams represent different subscriber counts/utilization on each - but I'm sure the competition would love to have the detailed figures for more targeted marketing efforts;)

  3. Total ViaSat-1 capacity was 140 Gbps at launch - presumably spread equally across 72 spot beams (69 beams cover US while 3 cover Canada thru Xplorenet or approximately 2 Gbps per spot beam). Just a guess since total ViaSat-2 capacity is now being touted at 350 Gbps with the following claim "Our new system will add another dimension to that capability, with a networking system that can quickly shift or add capacity to markets where demand begins to grow or change."

  4. Proprietary - but much of it is associated with the Accelenet client/server technology which is responsible for compression, bundling responses to minimize roundtrips and reduce chattiness on the longer part of the haul, and probably some caching. The core node above is the server, while the modem represents the client where the client software is embedded. Accelenet is what gives the appearance of lower latency - without it you might as well call it Wildblue with better speeds. A Google search on AcceleNet provides some minimal insight - but the illusion is all software and/or firmware based.     

  5. No idea... but there are some indications that enabling QoS at the router or operating system can have some negative speed impacts due to incompatible rules - and getting into a "you go first, no you go first , no I insist..." scenario.

(Edited)
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david, Champion

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Unless he's figured out how to beat the speed of light he's not getting those ping times.
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Old Labs

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Unless he's figured out how to beat the speed of light he's not getting those ping times.
In the off chance that he has, please share... knowing that I'm pretty sure I'd be able to setup the DeLorean for October 25, 1986, go back and tell John McNamara to pull Bill Buckner resulting in an earlier lifting of the Curse of the Bambino...
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Hunter

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Okay, awesome, thank you for the info Labs. Additionally do you have any idea where I might be able to get a manual for the dishes/trias that Exede uses? I'm really interested in knowing how to operate them/how they operate in case I ever come across a client or business that uses them.


Best regards,

Hunter
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bill nord

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Hang in there Hunter,  I'm sure one(or more) of the Champions will fill in the blank spots.
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Bev, Champion

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Pretty simple really. With Exede Voice, the equipment and service help compensate for latency and, yes there is a very brief delay using that VOIP. For gaming, we can't get under 700ms or so BUT we can use a registry edit to help compensate for it. Leatrix Latency Fix, originally designed for WoW explains it, and even does the edit for you, or you can just do it manually.

No it doesn't actually lower latency one bit, but it does make your computer respond to the server faster, thus compensating for the high latency we can't avoid.

VOIP is Exede, they make that possible for us but, gaming is hit and miss, and some misses can be compensated for by the user with a simple registry edit.

I use it to play Rift, even 20 man raids are fine for me.
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Hunter

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Hey Bev, please refer to the above reply to David.

In regard to LLF, so it basically just increases TCPAckFrequency? 
Also
How does Exedes' equipment aid in latency compensation?

Best regards,

Hunter
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Alex, Viasat Corporate Communications

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Hunter, our NOC is here in Denver, BTW. On the latency compensation, our ViaSat Web Acceleration software (which replaced Accelenet earlier this year) mostly is a way to speed page loading times by pre-fetching pieces-parts of the websites. If you open, say, USA Today, the software starts teeing up all of the elements that might be called upon so that, if you do click on them, they're ready to go. It's kinda like pulling up a truck full of all available pizzas in front of your house so that when call in an order, the right pizza can be delivered very quickly as opposed to having to wait for it to come from the restaurant 22,000 miles away.
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Jim16, Champion

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I'll take a large pepperoni, in 700ms!!!
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Hunter

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Thanks for the speedy reply Alex, and yea in terms of page loading I understand completely how WA works, but that wasn't really what was concerning me mainly, it was the fact that the client was reporting such low ping times, which after further investigation proved false. I am quite interested however in learning more about your customer side tech, so any manuals or guides for customer trias/dishes would be much appreciated, however I'm not expecting you to personally get in contact with Viasat and request info about ViaSat-1/Anik F2 and Wildblue satellites and how they communicate, no matter how awesome that would be, perhaps if I could even get in direct contact with one of your NOC reps directly, that would also be very helpful in case I have any in depth questions, even though the forums have proven to be very helpful.



Best regards,

Hunter