[Asterisk-biz] VoIP over satellite

[alex at pilosoft.com]

On Mon, 22 Nov 2004, Tracy R Reed wrote:

> > don't know what carriers you guys are using, but the guys I deal with
> > have about 250 ms delay ( one-way ) you must be referring to the
> > "consumer" services as opposed to buying transponder space on a real
> > satellite.  We do SIP over satellite, no problem at all.  When you buy
> > transponder space, you pay for the quality, but it's equivalent to the
> > delay on a cell phone.  Just enough to be annoying, but good enough
> > for the unaware end user.
> 
> If the speed of light delay is .6 seconds one way resulting in 1.2 round
> trip plus a little for equipment and landline latency how can you get
> 250ms one way or .5 total?
How did you calculate .6s one-way? 35k km above MSL is only 0.12ms 
one-way delay (light travels at 300000 km/s).

-alex