The altitude of a geostationary satellite is about 37500 km for a round trip distance of aboyt 75000 km. Light travels at 300,000 km/second, so you have a latency of about 250 ms per hop. That is just for the transit time to and from the bird. Since you have a two way conversation, a caller asking a question would have to wait a minimum of 500 ms for a reply. This does not include any signal processing that might take place. In other words, you will still have to account for the "normal" voip latency. A satellite path might have several hops, each adding its own 500 ms delay. With a geostationary satellite, you really can't have anything approaching a full duplex/real time telephone conversation. The conversations you have would more closely resemble simplex two-way radio conversation.
That being said, if that's all you have, useful communications can be had using this mode. The International space station, for instance. uses several TDRS satellites to communicate with Houston. The big thing is training the users. Bill On 5/11/05, Yiannis Costopoulos <[EMAIL PROTECTED]> wrote: > Hi All, > > I am investigating the deployment of VoIP/* in Eastern European areas > where > there is no PSTN infrastructure. As you can understand DSL/Cable connections > are a dream. The only option is satellite. > > Does anyone know of any satellite providers that have low enough/acceptable > delays for VoIP? > > Thanks, > Yiannis. > > _______________________________________________ > 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 > _______________________________________________ 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
