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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Starlink
[mailto:starlink-bounces@lists.bufferbloat.net] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Mike Puchol<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, February 21, 2022
9:35 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Daniel AJ Sokolov; David Lang<br>
<b><span style='font-weight:bold'>Cc:</span></b> starlink@lists.bufferbloat.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Starlink] Starlink
Roaming</span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Actually, laser links
would make gateway connectivity *worse*. If we take the scenario attached, one
gateway is suddenly having to serve traffic from all UTs that were not
previously under coverage. <br>
<br>
A satellite under full load can saturate two gateway links by itself. If you
load, say, 20 satellites in an orbital plane, onto a single gateway, over ISL,
you effectively have 5% of each satellite’s capacity available (given an
equal distribution of demand, of course there will be satellites with no UTs to
cover etc.).<font color=navy><span style='color:navy'><o:p></o:p></span></font></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><i><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy;
font-weight:bold;font-style:italic'>[RR] I think to do this analysis correctly;
one needs to consider the larger system and the time-varying loads on the
components thereof. What you say is true; just a bit over-simplified to be maximally
useful. Routing through complex congested networks is well-studied problem and hnts
at possible solutions can probably be found there</span></font></i></b><b><i><font
size=2 color=navy face=Wingdings><span style='font-size:10.0pt;font-family:
Wingdings;color:navy;font-weight:bold;font-style:italic'>J</span></font></i></b><b><i><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy;font-weight:bold;font-style:italic'>)<o:p></o:p></span></font></i></b></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
<br>
Eventually they will go for optical gateways, it’s the only way to get
enough capacity to the constellation, specially the 30k satellite version.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><i><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy;
font-weight:bold;font-style:italic'>[RR] What do you mean by “”optical
gateway”? An optical link from the satellite to the ground station? That
would be real expensive at least power-wise and unreliable.</span></font></i></b><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
Best,<br>
<br>
Mike<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Feb 22, 2022, 05:17 +0300, David Lang <david@lang.hm>, wrote:<br>
<br>
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Mon, 21 Feb 2022, Daniel AJ Sokolov wrote:<br>
<br>
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On 2022-02-21 at 13:52, David Lang wrote:<br>
<br>
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
They told me that I could try it, and it may work, may be degraded a<br>
bit, or may not work at all. They do plan to add roaming capabilities in<br>
the future (my guess is that the laser satellites will enable a lot more<br>
flexibility)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
Isn't that a very optimistic assessment? :-)<br>
<br>
Laser links are great for remote locations with very few users, but how<br>
could they relieve overbooking of Starlink in areas with too many users?<br>
<br>
The laser links can reduce the required density of ground stations, but<br>
they don't add capacity to the network. Any ground station not built<br>
thanks to laser links adds load to other ground stations - and, maybe<br>
more importantly, adds load to the satellite that does eventually<br>
connect to a ground station.<br>
<br>
Can laser links really help on a large scale, or are they just a small<br>
help here and there?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
My thinking is that the laser links will make it possible to route the traffic<br>
from wherever I am to the appropriate ground station that I'm registered with
as<br>
opposed to the current bent-pipe approach where, if I move to far from my<br>
registered location, I need to talk to a different ground station.<br>
<br>
Currently there are two limits in any area for coverage:<br>
<br>
1. satellite bandwidth<br>
2. ground station bandwidth<br>
<br>
laser links will significantly reduce the effect of the second one.<br>
<br>
We know that they can do mobile dishes (they are testing it currently on Elon's<br>
gulfstream, FAR more mobile that I will ever be :-) )<br>
<br>
David Lang<br>
_______________________________________________<br>
Starlink mailing list<br>
Starlink@lists.bufferbloat.net<br>
https://lists.bufferbloat.net/listinfo/starlink<o:p></o:p></span></font></p>
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