On Sat, 2005-08-27 at 12:14 -0700, Julius Igugu wrote: > I use a satellite connection and VOIP is ok! > > It depends,mostly, on what you expect! > > There's an inherent delay in the system usually about 700ms - 800ms! but this > is bearable.
That depends on how you define satellite and the network itself... Satellites are things that orbit the earth (duh) but where they orbit is critical to latency. Some systems are in geostationary orbit and have much higher latencies. Radio signals go about the speed of light (just to cut off anyone who wants to correct my 'about' comment ... when passing through matter even light slows down). LEO (low earth orbiting) satellites that are not fixed to a given location in the sky are much closer, and have much ess latency. The newer variant of artificial satelites is a solar powered airplane, which is WAY closer and thus has much less latency (about 18 miles so the latency is hardly detectable from the RF link). afaik there are no stratelites (what the solar powered airplanes are now being called because they fly in the stratosphere) in active deployment but there are companies planning on doing those. 1 stratelite can do an area roughly the size of texas (for non americans that is a very large area, google it if you want to know the sq km/mi :) At 18 miles you still need a good antenna system (wifi has done 125 miles at 11mbps unamplified with a 300mw card so it is possible ...) A lot of satelite providers overload their networks for cost reasons (its really expensive to upgrade the routing equipment) as such those devices add extra latency to the mix, geostationary orbit is about 250ms each direction so anything over 500ms is normally caused by routing equipment not being able to transmit as quickly as it should ... With the newer systems coming out it should be even better. 18 miles would be no worse than wire based systems in most instances, provided the equipment is upgraded regularly, and time to deploy, dost to upgrade, etc are lower so that just might happen. -- Trixter http://www.0xdecafbad.com Bret McDanel UK +44 870 340 4605 Germany +49 801 777 555 3402 US +1 360 207 0479 or +1 516 687 5200 FreeWorldDialup: 635378
signature.asc
Description: This is a digitally signed message part
_______________________________________________ --Bandwidth and Colocation sponsored by Easynews.com -- Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
