4 ms·
How do you get an uplink? I generally thought of satellites as providing pretty good downlink, but high latency because the uplink was through some alternative
by toufka 10y ago
How do you get an uplink? I generally thought of satellites as providing pretty good downlink, but high latency because the uplink was through some alternative network - eg. phone/dsl lines.
- hueving 10y agoHigh latency was because it was in geosync orbit, not because of the asymmetric uplink. In fact, the asymmetric uplink was to try to improve the terrible latency.
- devicenull 10y agoNo, phone/dsl lines have very low latency. The latency is purely a factor of time to get to the satellite. Uplink bandwidth has been an issue in the past (phone/dsl is fairly slow speeds, at least in the places you'd want satellite internet)
- viraptor 10y agoIt depends on the satellite. The higher they are, the higher the latency / lower power / lower effective speed. Spacex plans for very low orbit. They're going for 1,110-1,325 km heights, which should give them the planned <20ms latency. Existing Iridium is at 781 km and offers rather slow and expensive, global connections. But they provide phones, with reasonable-sized antennas: https://en.wikipedia.org/wiki/Iridium_Communications https://en.wikipedia.org/wiki/Iridium_Communications