[Asterisk-biz] VoIP over satellite

Adam Hart adam at teragen.com.au
Mon Nov 22 20:13:30 MST 2004

alex at pilosoft.com wrote:
> 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

Not to be picky, but remember that packet has to go back down again so 
times two.


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