<span style=" font-size:10pt;font-family:sans-serif">Dear Andrea,</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">I fully support
your conclusions.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Regards, Enrico</span>
<br>
<br>
<br>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style=" font-size:9pt;font-family:sans-serif">"Andrea
Modenini (external)" <Andrea.Modenini@esa.int></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style=" font-size:9pt;font-family:sans-serif">"Space
Link Coding & Synchronization Working Group" <sls-cc@mailman.ccsds.org></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style=" font-size:9pt;font-family:sans-serif">28/07/21
16:02</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">[SLS-CC]
CCSDS 230.1-G-2.1 - Green Book TC - approved with comments - please check
deadline</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: </span><span style=" font-size:9pt;font-family:sans-serif">"SLS-CC"
<sls-cc-bounces@mailman.ccsds.org></span>
<br>
<hr noshade>
<br>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Dear colleagues,</span><span style=" font-size:12pt">
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
with reference to the Green Book of the TC, at CESG pool, we got an approval
with conditions from SEA AD, with the feedback below.</span><span style=" font-size:12pt">
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
Following discussion with the SLS AD and DAD, it was decided to re-iterate
such conditions at WG level.</span><span style=" font-size:12pt"> <br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
Kindly, Ken already took action to provide a draft of the TC Green Book
implementing such edits (see attachment).</span><span style=" font-size:12pt">
<br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
I myself reviewed the comments: <br>
-Point 3, 4, and 5, look normal editorials.</span><span style=" font-size:12pt">
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
-point 1) is about including USLP. This appear in line with the Blue Book
review that we had recently</span><span style=" font-size:12pt"> </span><span style=" font-size:10pt;font-family:sans-serif"><br>
-point 2) implies instead the introduction of CFDP and LTP for TC. Personally
I am not aware that we had any discussion/input in the WG for allowing
the use of such protocols for TC, nor I see any content in the BlueBook.
<br>
If this is the case, my personal opinion would be to discard this last
point.</span><span style=" font-size:12pt"> <br>
<br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
Starting from this, could you please assess my conclusions and let me know
any disagreement no later than <b>13rd August EOB</b>?</span><span style=" font-size:12pt">
<br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
In case deadline <b><u>does not fit</u></b> because of planned vacation,
please also let me know that I will consider an extension.</span><span style=" font-size:12pt">
<br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
Kind Regards</span><span style=" font-size:12pt"> <br>
<br>
<br>
<br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
----</span><span style=" font-size:12pt"> <br>
</span>
<p style="margin-top:0px;margin-Bottom:10px"><span style=" font-size:10pt"><i>It's
great that this doc is now being updated, given all of the changes in the
C&S WG and other SLS standards. I identify the following Issues:</i></span></p>
<p style="margin-top:0px;margin-Bottom:10px"><span style=" font-size:10pt"><i>1)
There is no mention of USLP, expecially in the variable length frame mode.
Only TC is included. This must be fixed. Too many sections
to list.</i></span></p>
<p style="margin-top:0px;margin-Bottom:10px"><span style=" font-size:10pt"><i>2)
In sec 10.3.3.1 (and 10.3.3.4) the only option described for handling "long
wait times" on deep space links is the repeat function. However,
equally viable methods are to use CFDP of even LTP to provide automated
file or link layer reliability. These should be addressed.</i></span></p>
<p style="margin-top:0px;margin-Bottom:10px"><span style=" font-size:10pt"><i>3)
The term "CODEWORD", "Codeword", and "codeword"
are all used, sometimes in the same sentence. They look different
but apparently mean the same thing. Provide some description of this
early in the doc to avoid any possible confusion. Too many sections
to list.</i></span></p>
<p style="margin-top:0px;margin-Bottom:10px"><span style=" font-size:10pt"><i>4)
In Glossary "codeword" is not really defined, just a reference
is provided. Fix this. Also, both encoding and decoding definitions
only mention BCH, not LDPC. Please fix this throughout.</i></span></p>
<p style="margin-top:0px;margin-Bottom:10px"><span style=" font-size:10pt"><i>5)
There are many new scholarly references, which is fine. At least
one, [27], appears to have no reference identified in the body of the text.
Please fix this.</i></span></p>
<br><span style=" font-size:12pt"><br>
</span><span style=" font-size:8pt;color:#808080;font-family:Verdana"><b><br>
HE Space Operations for ESA - European Space Agency</b></span><span style=" font-size:12pt">
</span><span style=" font-size:8pt;color:#00a1e0;font-family:Verdana"><b><br>
Ph.D. Andrea Modenini</b></span><span style=" font-size:8pt;color:#808080;font-family:Verdana"><b><br>
Communication Systems & Technologies Engineer</b></span><span style=" font-size:12pt"><b>
</b></span><span style=" font-size:8pt;color:#808080;font-family:Verdana"><br>
TT&C and PDT Systems & Techniques Section (TEC-EST)<br>
RF Systems Division<b><br>
ESTEC</b><br>
Keplerlaan 1, PO Box 299<br>
NL-2200 AG Noordwijk, The Netherlands<br>
andrea.modenini@esa.int | </span><a href=http://www.esa.int/><span style=" font-size:8pt;color:#8f8f8f;font-family:Verdana"><u>www.esa.int</u></span></a><span style=" font-size:8pt;color:#808080;font-family:Verdana"><br>
T +31 71 56 53439, M +31 6 484 56 527</span>
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