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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Dear All,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>As Massimo requested, I modified
the minutes of the last meeting (<st1:City w:st="on"><st1:place w:st="on">Portsmouth</st1:place></st1:City>):<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><a
href="http://cwe.ccsds.org/sls/docs/SLS-OCM/Meeting%20Materials/2010_05_Portsmouth/SIG_OCM_20100825_MoM.pdf">http://cwe.ccsds.org/sls/docs/SLS-OCM/Meeting%20Materials/2010_05_Portsmouth/SIG_OCM_20100825_MoM.pdf</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>by adding his following remarks
on the topic “LEO downlinks: direct and GEO-relay links”:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><i><font size=2 color=navy
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:navy;font-style:italic'>i) The comparison (in term of throughput) between
RF and optical LEO-GND assumes 800Mbps for the RF link, while the comparison
would better consider the expected data rates using K band (26 GHz). During the
Spring meeting, ESA showed the expected average data rate in this band would be
above 1.3Gbps over a 540MHz channel adopting VCM techniques (above 800Mbps
without VCM), for a polar station (Svalbard). Considering that the band can accomodate
2 such channels, more than 2.6Gbps average data rate can be expected. So these
figures may change the outlook of the comparison RF vs optical. (Even though
Optical with WDM would still provide higher throughput, according to the
figures provided). <o:p></o:p></span></font></i></p>
<p class=MsoNormal style='margin-left:35.4pt'><i><font size=2 color=navy
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:navy;font-style:italic'>ii) The conclusion that “a direct LEO-GND
is cheaper than a LEO-GEO-GND” doesn't fully represent the situation in
the relative short term (5-10 years), considering the current technical
developments on LEO-GEO-GND links (e.g. EDRS, Alphasat).<o:p></o:p></span></font></i></p>
<p class=MsoNormal><i><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy;font-style:italic'><o:p> </o:p></span></font></i></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Regards<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Nicolas<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>-- <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Nicolas Perlot, Ph.D. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Digital Networks Section,
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Optical Communications
Group <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>German Aerospace Center
(DLR)
phone: ++49/8153/281836 <o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:PlaceType w:st="on"><font size=2
color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:
Arial;color:navy'>Institute</span></font></st1:PlaceType><font size=2
color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:
Arial;color:navy'> of <st1:PlaceName w:st="on">Communications</st1:PlaceName></span></font></st1:place><font
size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'> and Navigation
fax: ++49/8153/282844 <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Oberpfaffenhofen, <st1:address
w:st="on"><st1:Street w:st="on">P.O. Box</st1:Street> 11 16</st1:address>
email: nicolas.perlot@dlr.de <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>82234 <st1:place w:st="on"><st1:City
w:st="on">Wessling</st1:City>, <st1:country-region w:st="on">Germany</st1:country-region></st1:place>
http://www.dlr.de/KN/KN-DN/<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
Massimo.Bertinelli@esa.int [mailto:Massimo.Bertinelli@esa.int] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Mittwoch, 18. August 2010
16:00<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Perlot,
Nicolas</st1:PersonName><br>
<b><span style='font-weight:bold'>Cc:</span></b> sls-com@mailman.ccsds.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Sls-ocm] Charter
draft for OCM working goup</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'>Dear Nicolas,</span></font> <br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>thank
you for your reply.</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>For
the sake of clarity, I would like to point out that, in my mail of 23.07, I was
objecting to the minutes produced after the meeting, not to the content of your
presentation.</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>I
certainly don't ask to change the view of your Institution, as contained in
such presentation, whether I agree or not. </span></font><br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>Nevertheless,
it would be fair that the moms reflect all the opinions expressed during the
meeting. </span></font><br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>The
way they are now (as published in CWE), in my opinion, they don't mirror the
discussions we had. </span></font><br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>If
you wish, I can certainly provide you with a summary of the points I raised in
Virginia Beach.</span></font> <br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>Best
regards,</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>Massimo<br>
---------------------------------------------------<br>
Massimo Bertinelli<br>
Communication Systems Engineer<br>
ESA/Estec<br>
<br>
Tel. +31 (0)71 5653435<br>
--------------------------------------------------</span></font> <br>
<br>
<o:p></o:p></p>
<table class=MsoNormalTable border=0 cellpadding=0 width="100%"
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<p class=MsoNormal><font size=1 color="#5f5f5f" face=sans-serif><span
style='font-size:7.5pt;font-family:sans-serif;color:#5F5F5F'>From:</span></font>
<o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><font size=1 face=sans-serif><span style='font-size:7.5pt;
font-family:sans-serif'><Nicolas.Perlot@dlr.de></span></font> <o:p></o:p></p>
</td>
</tr>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><font size=1 color="#5f5f5f" face=sans-serif><span
style='font-size:7.5pt;font-family:sans-serif;color:#5F5F5F'>To:</span></font>
<o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><font size=1 face=sans-serif><span style='font-size:7.5pt;
font-family:sans-serif'><Massimo.Bertinelli@esa.int></span></font> <o:p></o:p></p>
</td>
</tr>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><font size=1 color="#5f5f5f" face=sans-serif><span
style='font-size:7.5pt;font-family:sans-serif;color:#5F5F5F'>Cc:</span></font>
<o:p></o:p></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><font size=1 face=sans-serif><span style='font-size:7.5pt;
font-family:sans-serif'><sls-com@mailman.ccsds.org>,
<sls-com-bounces@mailman.ccsds.org></span></font> <o:p></o:p></p>
</td>
</tr>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><font size=1 color="#5f5f5f" face=sans-serif><span
style='font-size:7.5pt;font-family:sans-serif;color:#5F5F5F'>Date:</span></font>
<o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><font size=1 face=sans-serif><span style='font-size:7.5pt;
font-family:sans-serif'>09/08/2010 11:41</span></font> <o:p></o:p></p>
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<p class=MsoNormal><font size=1 color="#5f5f5f" face=sans-serif><span
style='font-size:7.5pt;font-family:sans-serif;color:#5F5F5F'>Subject:</span></font>
<o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><font size=1 face=sans-serif><span style='font-size:7.5pt;
font-family:sans-serif'>RE: [Sls-ocm] Charter draft for OCM working goup</span></font><o:p></o:p></p>
</td>
</tr>
</table>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" noshade color=gray align=center>
</span></font></div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br>
<br>
</span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>Dear Massimo,</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>1) I
agree that we should have a completed version of the white paper as soon as
possible.</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>2) As
you suggested, I will add the following point on the agenda of the Fall meeting
(London): “Discussion on the participation of ESA to the OCM work and on
ESA internal approval process”.</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>3)
About your objections during the Spring meeting:</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>If I
remember correctly, you objected during my presentation on direct LEO downlinks
that GEO satellites with optical payloads were already flying (ARTEMIS) or
about to fly (Alphasat, EDRS). J-L. Gerner also mentioned the need for onboard
memory for direct optical downlinks. I agree. But these remarks do not change
the view of my institute DLR-IKN (and also my view) on direct LEO downlinks.
What I was presenting was the view of my institute DLR-IKN, just like JPL, NICT
and JAXA presented their views on optical links. If ESA has different views
which you are aware of, you are welcome to present them.</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>So the
document I presented was a DLR-IKN document supporting CCSDS discussion, but it
was not a CCSDS document. So it does not have to contain your remarks.</span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>4)
I suggest to avoid the Post Scriptum in e-mails and to keep the message
content before the signature: I saw your P.S. only the second time I read your
message. I recognize, though, the usefulness of P.S. for paper letters.</span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Regards,</span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Nicolas
</span></font><br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Chair
of OCM-SIG</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>-- </span></font><br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Nicolas
Perlot, Ph.D.</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Digital
Networks Section,</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Optical
Communications Group</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>German
Aerospace Center (DLR)
phone: ++49/8153/281836</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Institute
of Communications and Navigation fax: ++49/8153/282844</span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Oberpfaffenhofen,
P.O. Box 11 16 email:
nicolas.perlot@dlr.de</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>82234
Wessling, Germany
</span></font><a href="http://www.dlr.de/KN/KN-DN/"><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>http://www.dlr.de/KN/KN-DN/</span></font></a><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'> </span></font> <o:p></o:p></p>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
</span></font><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'> Massimo.Bertinelli@esa.int
[</span></font><a href="mailto:Massimo.Bertinelli@esa.int"><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>mailto:Massimo.Bertinelli@esa.int</span></font></a><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>] <b><span
style='font-weight:bold'><br>
Sent:</span></b> Freitag, 23. Juli 2010 15:12<b><span style='font-weight:bold'><br>
To:</span></b> <st1:PersonName w:st="on">Perlot, Nicolas</st1:PersonName><b><span
style='font-weight:bold'><br>
Cc:</span></b> sls-com@mailman.ccsds.org; sls-com-bounces@mailman.ccsds.org<b><span
style='font-weight:bold'><br>
Subject:</span></b> Re: [Sls-ocm] Charter draft for OCM working goup</span></font>
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<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
Dear Nicolas,</span></font> <font size=2 face=sans-serif><span
style='font-size:10.0pt;font-family:sans-serif'><br>
thank you for the draft.</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
As an ESA SIG member, it is my opinion that the creation of a new WG is still
premature, while the SIG should first finish the work it was supposed to do.</span></font>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
In particular, I believe that the SIG should finalize the white book on
"Optical coding and modulation". Eventually, once the material is
more mature, a Green Book may be delivered.</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
In any case, some more time and supporting material will be necessary to
understand whether ESA can partecipate to the work, due to the internal
approval process.</span></font> <font size=2 face=sans-serif><span
style='font-size:10.0pt;font-family:sans-serif'><br>
I would suggest coming back to this at the London meeting, after the technical
discussions are over.</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
Best regards,</span></font> <font size=2 face=sans-serif><span
style='font-size:10.0pt;font-family:sans-serif'><br>
Massimo</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
P.S. By the way, at the Virginia Beach meeting I raised a number of objections
to the assumptions put forward for some of the scenarios, i.e. LEO-ground, but
I couldn't find any trace of them</span></font> <font size=2 face=sans-serif><span
style='font-size:10.0pt;font-family:sans-serif'><br>
in the minutes.</span></font> <font size=2
face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
<br>
---------------------------------------------------<br>
Massimo Bertinelli<br>
Communication Systems Engineer<br>
ESA/Estec<br>
<br>
Tel. +31 (0)71 5653435<br>
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<p class=MsoNormal><b><font size=1 face=sans-serif><span style='font-size:
7.5pt;font-family:sans-serif;font-weight:bold'><Nicolas.Perlot@dlr.de></span></font></b><font
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Sent by: sls-com-bounces@mailman.ccsds.org</span></font> <o:p></o:p></p>
<p><font size=1 face=sans-serif><span style='font-size:7.5pt;font-family:
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<p class=MsoNormal><font size=1 face=sans-serif><span style='font-size:
7.5pt;font-family:sans-serif'>[Sls-ocm] Charter draft for OCM working goup</span></font><o:p></o:p></p>
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</span></font><font size=2 face="Courier New"><span style='font-size:10.0pt;
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Dear Lasercom people,<br>
<br>
Find attached a draft of the charter for the creation of a CCSDS working group
"Optical coding and modulations".<br>
Please send me your feedback within 3 weeks (till July, 26th). If your agency
is a CCSDS member agency, check whether it indeed supports the specific
scenarios as established in the last column of the scenario table.<br>
<br>
Regards,<br>
<br>
Nicolas Perlot<br>
Chair of the SIG "OCM"<br>
[attachment "Proposed_Charter_OCM_WG.doc" deleted by Massimo
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