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<div class="moz-cite-prefix">On 10/06/2024 11:50 am, Dave Taht via
Starlink wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAA93jw6A4TNBL5zBFsrJwi3AOjbjun2B98fjyAc3NY0BJsLUPA@mail.gmail.com">
<div dir="ltr"><br>
<div>The second set of questions are that the newer, larger
Starlink satellites were designed, oh, 4 years ago? with about
4x the capacity of the existing ones, and I imagine (and hope)
that they have been continually redesigned with an eye to
latency now, as well as capacity. </div>
</div>
</blockquote>
<p>What do you actually mean by "capacity" here? We have actual
numbers in terms of what SpaceX are licensed for for user
downlink, and that works out to be:</p>
<p>From a V1 or V1.5:<br>
</p>
<ul>
<li>no more than 12 Gb/s into a single cell.<br>
</li>
<li>no more than 16 Gb/s across all user downlink beams.</li>
</ul>
<p>From a V2(mini):</p>
<ul>
<li>no more than 20 Gb/s into a single cell on Ku.</li>
<li>no more than 48 Gb/s across all beams licensed for Ku user
downlink.</li>
<li>no more than 25.2 Gb/s across all beams licensed for Ka user
downlink into a single cell.</li>
<li>no more than 99.2 Gb/s across all beams licensed for Ka user
downlink.</li>
</ul>
<p>Note:</p>
<ul>
<li>The current Dishys don't seem to do Ka, at least going by
their FCC licenses.</li>
<li>In Gen 2 systems, there is no longer an explicit distinction
made between user and gateway downlinks on at least some beams,
so the above figures assume that all service downlink beams are
carrying user traffic. </li>
<li>The above figure are before any FEC.</li>
<li>The single cell limits are independent of the number of
satellites you deploy - it's the most a cell can get.</li>
</ul>
<p>But, like you, I'm somewhat intrigued that we haven't see any
follow-up applications from SpaceX at the FCC for the 3rd
generation. SAT-LOA-20200526-00055 is four years old, and its
latest amendment from March this year (unless something's popped
up in the last few weeks) relates to their D2D plans only. The
latest amendment pertinent to Internet things is from August 2021.
The gap between Gen 1 (SAT-LOA-20170726-00110) and Gen 2 (SAT-LOA-20200526-00055)
was just over three years - and it took almost that long to get
SAT-LOA-20170726-00110's last modification SAT-MOD-20200417-00037
filed. Maybe now that they know that they can get a lift, they
will. Or maybe they're going flag of convenience and will launch
under the Tongan regulator, where they've applied for 29,995
satellites, somewhat more recently.<br>
</p>
--
<pre class="moz-signature" cols="72">****************************************************************
Dr. Ulrich Speidel
School of Computer Science
Room 303S.594 (City Campus)
The University of Auckland
<a class="moz-txt-link-abbreviated" href="mailto:u.speidel@auckland.ac.nz">u.speidel@auckland.ac.nz</a>
<a class="moz-txt-link-freetext" href="http://www.cs.auckland.ac.nz/~ulrich/">http://www.cs.auckland.ac.nz/~ulrich/</a>
****************************************************************
</pre>
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