[Asterisk-Users] Satellite WAN

Wed Nov 2 12:53:59 MST 2005

We, in the past tried this on a link in Africa.

The real problem is not the delay (You forget the most important, which is
the latency time on every electronic device on your path), but the changes
on the delay depending on the load of the satellite and if is using dynamic
allocation or not. Jitter is another non manageable situation. Only static
allocation of bandwith are situations on that we can think on do tests.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steve Kennedy
Sent: Wednesday, November 02, 2005 1:27 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Satellite WAN

On Wed, Nov 02, 2005 at 12:31:48PM -0500, Adam Moffett wrote:

> I have no experience in the matter whatsoever ;)
> But, I can say that long distance phone calls (non-voip) are sometimes 
> carried over sattelite when fiber is not available. 
> It must be possible for voip, but the latency and jitter would be 
> tremendous and although I am not an expert on the matter, I would 
> suggest that you would only be replacing one set of problems with a new 
> set of problems.

Using TDM delays are horrid (I remember calls to the US before TAT8 was
installed and most calls went via satellite).

Geostationary orbit 30K miles (approx), therefore up-leg plus down-leg
is 60K miles. Light travels at 186K miles/s, so that's a 1/3 of a second
delay in one direction (ignoring any delays through the satelitte to
reduce interference etc), so that's 2/3s there and back.

Steve

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