4 ms·
"low-latency links", says the article. I wonder if they consider 500 ms ping to be low, or if they want to replace Geostationary with Low Earth Orbit.
by Meneth 7mo ago
"low-latency links", says the article. I wonder if they consider 500 ms ping to be low, or if they want to replace Geostationary with Low Earth Orbit.
- fidotron 7mo agoGetting it to work with one end stationary first sounds like a reasonable development plan. LEO adds a lot of complexity, but with huge benefits. OTOH the number of engineers that focus on throughput over latency is quite staggering.
- IrishTechie 7mo agoI guess if your goal is just to stream aircraft telemetry and black box like recordings then latency may not be high on the agenda.
- SiempreViernes 7mo agoI think it's the opposite? For small telemetry you want it now, but for the big data products there's no hope of "now" and so you settle for soon.
- connicpu 7mo agoBlack box data doesn't need that crazy throughput either though. Traditional RF is much easier to get right, and works even when the aircraft starts losing track of where it is and stops being able to track the satellite with its laser
- amarant 7mo agoLeo seems easier to me. Geostationary is really far away. Leo is much, much closer. It's easier to hit a buck thats running right past you than to hit a stationary target across the Atlantic. Especially if you yourself are on a moving platform
- pottertheotter 7mo agoI’ll take 500ms ping for those speeds while temporarily on a plane.
- oofbey 7mo agoNo doubt! I’ve measured literal 5 minute ping times on airplanes. 300,000ms. Where are the buffering the packets!?
- raddan 7mo agoMy guess is that you're getting retransmissions because of dropped frames, not because there's some huge buffer in the sky.
- reactordev 7mo agoIndicated airspeed 280kts, ground speed 470kts, FL410, the packets are trying to catch up…
- JackFr 7mo agoI like "huge buffer in the sky". That's where I imagine all my deleted data goes.
- 0_____0 7mo agowe're all just riding the ring buffer of samsara, maaan
- BobbyTables2 7mo agoThere’s one huge buffer in the sky! The huge buffers are at the two endpoints (:->
- adev_ 7mo ago> "low-latency links", says the article. I wonder if they consider 500 ms ping to be low, or if they want to replace Geostationary with Low Earth Orbit. Directional laser beams are orders of magnitude to jam compared to radio wave. That alone makes it of big interest for military applications, even with 500 ms latency. There is several known cases where jamming caused the loss of costly military drones. https://en.wikipedia.org/wiki/Iran%E2%80%93U.S._RQ-170_incident https://en.wikipedia.org/wiki/Iran%E2%80%93U.S._RQ-170_incid... Laser comms could prevent that entirely.
- shagie 7mo ago> Directional laser beams are orders of magnitude to jam compared to radio wave. That alone makes it of big interest for military applications, even with 500 ms latency. I am reminded of RFC 1217 - Memo from the Consortium for Slow Commotion Research (CSCR) https://www.rfc-editor.org/rfc/rfc1217 https://www.rfc-editor.org/rfc/rfc1217 2. Jam-Resistant Land Mobile Communications This system uses a highly redundant optical communication technique to achieve ultra-low, ultra-robust transmission. The basic unit is the M1A1 tank. Each tank is labelled with the number 0 or 1 painted four feet high on the tank turret in yellow, day-glo luminescent paint. Several detection methods are under consideration:
- deleted 7mo ago[deleted]
- Spoom 7mo agoI love that this was ostensibly written by Vint Cerf.
- shagie 7mo agoIt's listed in his computer science bibliography https://dblp.org/pid/c/VintonGCerf.html https://dblp.org/pid/c/VintonGCerf.html and https://en.wikipedia.org/wiki/Vint_Cerf#Author https://en.wikipedia.org/wiki/Vint_Cerf#Author Though the edit for that authorship to the RFC came much later. https://datatracker.ietf.org/doc/rfc1217/history/ https://datatracker.ietf.org/doc/rfc1217/history/
- rtkwe 7mo agoGeostationary is easier to hit than a LEO constellation like Starlink. With an LEO target you need to switch at least every 2-4 minutes, Starlink ground stations can switch multiple times per minute but that's for obstacle avoidance in the air you'd only have to switch when the current target moves out of LOS entirely.