xplornet contact or any experience with their satellite service?

Brian J. Murrell brian at interlinx.bc.ca
Tue Apr 21 18:35:06 UTC 2020


On Tue, 2020-04-21 at 11:11 -0700, Sabri Berisha wrote:
> Hi,

Hi,

> Where I worked, phy transmissions are scheduled based on tokens. A UT
> must have a token to transmit data. If there is no congestion, a
> token will be available and the UT or ground station may transmit.
> Congestion does not need to exist in the ground network or even the
> transponder. It can even be in the spectrum of that geographical
> area. 

Interesting.  So basically as Mel said, over-sold network.  :-(

> To overcome the latency,

Latency (AFAIU) is not really his primary issue.  it's the lack of
consistency in bandwidth.  Periods of a second or two even where there
is no transmission of anything at all followed by a second or two of
transmission bursting even beyond his subscribed "rate".  This effects
his subscribed rate but in a really bad way for real-time traffic such
as live/two-way video.  He'd much, much more rather get a consistent
pipe at his prescribed rate rather than an average of it over longer
periods of time because then the codec would not have be encoding for
those super bad periods of time where there are 1-2 seconds of no
bandwidth at all.

> Satellite is obviously not the optimal medium for video conferencing,

Indeed.

> but I would recommend that your friend tries to ratelimit their
> transmissions.

He doesn't need to.  The over-congested network is doing that for him. 
:-(  In any case, I don't know that he has any way to put a rate limit
on the tools he is using.

> The reason why your latency is higher than you expect,

It actually isn't.  It's nowhere near as high as I had come to
(anecdotally -- I'd never had reason to do the math on the latency
before now) believe it would be.

Fortunately he might be a candidate for Xplornet (or others') WISP
services.  Hopefully they are a bit more stable.

Cheers,
b.

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