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<p class="MsoNormal">Dear Andrea,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I completely respect the C&S WG when it comes to defining the best methods for doing coding and synchronization. That is your field of expertise and it is not an area where I have such expertise. I have always been supportive of, and
accepting of, the technical recommendations from both the C&S and RFM experts. In general do trust your knowledge and abilities in the domain in which you operate.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">That said, my knowledge and expertise, and my responsibility in CCSDS, is in systems architecture and systems engineering. I, and other CESG members, are supposed to look across ALL of the CCSDS standards and understand how they are to
fit together, starting at the RF and optical domain and including all seven of the ISO layers and the kinds of distributed suites of applications that are built on top of these. I have personally been working in this field of distributed systems architectures
for more than 30 years, so I must also ask you to respect my knowledge and expertise.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I look at what C&S has constructed, over the last 40 years, I see an expanding set of coding and synchronization approaches that have grown over time, following technical advances in the field. I do not really need to remind you of
this, but this suite of coding standards has included BCH, Reed Solomon, Convolutional, Turbo codes, and now LDPC. These each were, more or less, unique solutions that offered increasingly improved performance. There has always been some overlap in performance,
but there were also distinctly different technology features that justified adding new standards.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">With the advent of the current crop of VCM standards that picture has changed. We now have three different, nearly identical, VCM standards that all occupy the same “technology space”. As far as I can tell this was not the result of the
usual consensus process, but of a political process. I’m not stating this to lay blame anywhere, and certainly not on you who are new to the leadership of this working group. I am pointing it out because the CCSDS consensus process, when it works well,
works great. When it makes politically convenient choices the outcome is not always necessarily a superior one. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The existence of three VCM standards that all overlap to a substantial extent, and that occupy the same technology space is an observable fact. The statement I just made about this not being a superior outcome is my technical assessment,
or judgement.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">With this argument over the diagram we are right in this same territory of these VCM standards. My reference point for what is accurate is the body of CCSDS standards, including the C&S and the RFM, and the ISO BRM, ISO/EIC 7498. According
to that heavily reference standard, and to our own CCSDS breakdown of layers and sub-layers, there is an RF and optical physical sub-layer below the modulation sub-layer. The diagram, as drawn, fails to represent that accurately. This is not opinion, it
is observable fact. I can see it with my eyes. It requires no technical judgement, just observation.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As I said before, I will stand aside and allow you to publish this because I am really weary of fighting to make it right. But please do not characterize this as a failure of judgement on my part, and do not diminish in your thinking the
essential role that the CESG plays in reviewing all of the CCSDS standards and seeing to it that they fit together appropriately. That is an architectural oversight role that the CESG must exercise, and it may, by design, over-ride the choices made by any
one WG.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards, Peter<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">"Andrea Modenini (external)" <Andrea.Modenini@esa.int><br>
<b>Date: </b>Monday, August 23, 2021 at 2:01 AM<br>
<b>To: </b>Peter Shames <peter.m.shames@jpl.nasa.gov><br>
<b>Cc: </b>"Ignacio.Aguilar.Sanchez@esa.int" <Ignacio.Aguilar.Sanchez@esa.int>, Space Link Coding & Synchronization Working Group <sls-cc@mailman.ccsds.org><br>
<b>Subject: </b>Re: [SLS-CC] [EXTERNAL] Re: VCM technical corrigendum wording (AI_21_01)<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear Peter,</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"> I recognise that you have a different technical opinion. Differences in opinions are fundamental in CCSDS, that has been established exactly for being a forum of discussions.</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">This is recorded as part of the mailing list archives.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">However, I firmly ask you to also respect others' opinions.
</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">The C&S working group colleagues have a long time experience in the topic, contribute to the WG with dedication, and I perfectly trust trust their knowledge and abilities.</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Claiming that <i>the WG is choosing to publish a document with an known inaccurate diagram,
</i>is a value judgement that I would personally abstain from making.</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Regards</span> <br>
<br>
<br>
<b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray">HE Space Operations for ESA - European Space Agency</span></b>
<br>
<b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#00A1E0">Ph.D. Andrea Modenini</span></b><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
Communication Systems & Technologies Engineer</span></b><b><span style="font-size:12.0pt;font-family:"Tms Rmn",serif">
</span></b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><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</span><u><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:blue"><br>
</span></u><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray">andrea.modenini@esa.int |
</span><a href="https://urldefense.us/v3/__http:/www.esa.int/__;!!PvBDto6Hs4WbVuu7!Y1SHRM80waw5mchesvs2ybZTqId7-T2WaK6T-rv6TzYJ4MrUZ29ceCUoK46ttKw07pPMKSL9$"><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#8F8F8F">www.esa.int</span></a><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
T +31 71 56 53439, M +31 6 484 56 527</span> <br>
<br>
<br>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Shames, Peter M (US 312B)" <peter.m.shames@jpl.nasa.gov></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Andrea Modenini (external)" <Andrea.Modenini@esa.int>, "Space Link Coding & Synchronization Working Group"
<sls-cc@mailman.ccsds.org></span> <br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Cc: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Ignacio.Aguilar.Sanchez@esa.int" <Ignacio.Aguilar.Sanchez@esa.int></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">19-08-21 21:08</span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Re: [SLS-CC] [EXTERNAL] Re: VCM technical corrigendum wording (AI_21_01)</span>
<o:p></o:p></p>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="0" width="100%" noshade="" style="color:#A0A0A0" align="center">
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<p style="margin:0in">Dear Andrea,<o:p></o:p></p>
<p style="margin:0in"> <o:p></o:p></p>
<p style="margin:0in">I do understand that the WG wishes to publish this document with an inaccurate “informative” diagram. I want to go on record that I believe firmly that this is a mistake. I also think that your statement could just as easily have read:<o:p></o:p></p>
<p style="margin:0in"> <o:p></o:p></p>
<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Concerning the technical conclusions: VCM blue book defines the modulations (PSK/APSK), filtering/shaping (SRRC). There is nothing that
<span style="color:red">defines </span>the transparent transmission of the bits as defined by ISO 7498
<span style="color:red">except for CCSDS 401 document.</span> The remaining portions (frequency, phase noise tolerance, I/Q imbalance) in BlueBook 401
<span style="color:red">define the lowest sub- </span>layer.</span> <span style="font-size:10.0pt;font-family:"Arial",sans-serif">
<br>
This <span style="color:red">could have been </span>the conclusion of the WG, and we reached consensus as required by the CCSDS organization and processes YB.
</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Finally, I wish to remark that we're dealing just with notional, <span style="color:red">
but inaccurate, </span>informative diagram. The BB clearly will include that 401 shall be taken into account, hence, from pragmatic point of view the WG
<span style="color:red">is choosing to publish an document with an known inaccurate diagram</span>.</span><o:p></o:p></p>
<p style="margin:0in">This is, in my technical opinion, an accurate statement of what you have chosen to do. From my pragmatic point of view I do not wish to spend any more of my time trying to convince you to do the right thing. So if you do not want to
fix it, in accordance with CCSDS consensus process, I will stand aside and let you do the inaccurate thing.<o:p></o:p></p>
<p style="margin:0in"> <o:p></o:p></p>
<p style="margin:0in">Regards, Peter<o:p></o:p></p>
<p style="margin:0in"> <o:p></o:p></p>
<p style="margin:0in"> <o:p></o:p></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:2.5in;margin-left:0in">
________________________________________________________<br>
<br>
Peter Shames<br>
CCSDS Systems Engineering Area Director<br>
<br>
Jet Propulsion Laboratory, MS 301-490<br>
California Institute of Technology<br>
Pasadena, CA 91109 USA <br>
<br>
Telephone: +1 818 354-5740, Fax: +1 818 393-6871<br>
<br>
Internet: <a href="Peter.M.Shames@jpl.nasa.gov">Peter.M.Shames@jpl.nasa.gov</a><br>
________________________________________________________<br>
<br>
We must recognize the strong and undeniable influence that our language exerts on our ways of thinking and, in fact, delimits the abstract space in which we can formulate - give form to - our thoughts.<br>
<br>
Niklaus Wirth<o:p></o:p></p>
<p style="margin:0in"> <o:p></o:p></p>
<p style="margin:0in"> <o:p></o:p></p>
<p style="margin:0in"><b><span style="font-size:12.0pt">From: </span></b><span style="font-size:12.0pt">SLS-CC <sls-cc-bounces@mailman.ccsds.org> on behalf of "Andrea Modenini (external)" <Andrea.Modenini@esa.int><b><br>
Date: </b>Thursday, August 19, 2021 at 6:49 AM<b><br>
To: </b>Space Link Coding & Synchronization Working Group <sls-cc@mailman.ccsds.org><b><br>
Cc: </b>"Ignacio.Aguilar.Sanchez@esa.int" <Ignacio.Aguilar.Sanchez@esa.int><b><br>
Subject: </b>Re: [SLS-CC] [EXTERNAL] Re: VCM technical corrigendum wording (AI_21_01)</span><o:p></o:p></p>
<p style="margin:0in"> <o:p></o:p></p>
<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear Colleagues,</span>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
regarding the VCM technical corrigendum, I did not get additional comments.</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
In view of the WG consensus, I kindly ask SLS AD to raise a resolution for publication (copy in attachment)</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Kind Regards</span> <br>
<br>
<br>
<br>
<b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
HE Space Operations for ESA - European Space Agency</span></b> <b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#00A1E0"><br>
Ph.D. Andrea Modenini</span></b><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
Communication Systems & Technologies Engineer</span></b><b><span style="font-size:12.0pt">
</span></b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><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="https://urldefense.us/v3/__http:/www.esa.int/__;!!PvBDto6Hs4WbVuu7!dlWTyv111tTsX17d85u5I5r6V_MZo9fqQxMO5GtJ3x6wC0UwPLcyddXcIs3IOS46VCtc8WVO$"><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#8F8F8F">www.esa.int</span></a><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
T +31 71 56 53439, M +31 6 484 56 527</span> <br>
<br>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Andrea Modenini/estec/ESA</span>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Shames, Peter M (US 312B)" <peter.m.shames@jpl.nasa.gov></span>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Cc: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Lee, Dennis K (US 332G)" <dennis.k.lee@jpl.nasa.gov>, "Enrico Vassallo/esoc/ESA" <Enrico.Vassallo@esa.int>, "EXTERNAL-Pietras, John V (US 332C-Affiliate)" <john.pietras@gst.com>,
"Hamkins, Jon (US 3300)" <jon.hamkins@jpl.nasa.gov>, "Andrews, Kenneth S (US 332B)" <kenneth.s.andrews@jpl.nasa.gov>, "Space Link Coding & Synchronization Working Group" <sls-cc@mailman.ccsds.org>, Ignacio Aguilar Sanchez/estec/ESA@ESA, "Gilles Moury" <Gilles.Moury@cnes.fr></span>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">28-07-21 16:42</span>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Re: [EXTERNAL] Re: [SLS-CC] VCM technical corrigendum wording (AI_21_01)</span>
<o:p></o:p></p>
<div class="MsoNormal" align="center" style="text-align:center">
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<p style="margin:0in"><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Dear Peter,</span> <span style="font-size:10.0pt;font-family:"Arial",sans-serif">
<br>
thanks for your feedback. Sorry again for taking some time in replying, but I am still working 20% of the time.</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Concerning the involvement of the RFM working group in the VCM technical corrigendum, we had the joint RFM/C&S for which edits were agreed, representative was always involved, and we never got negative feedback.</span>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Additionally, this will be also crosschecked at SLS AD level before going to SLS resolution.
</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Concerning the technical conclusions: VCM blue book defines the modulations (PSK/APSK), filtering/shaping (SRRC). There is nothing that prevents to define the transparent transmission of the bits as defined by ISO 7498. The remaining portions (frequency, phase
noise tolerance, I/Q imbalance) in BlueBook 401 appear rather small for being an actual layer.</span>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
This was the conclusion of the WG, and we reached consensus as required by the CCSDS organization and processes YB.
</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Finally, I wish to remark that we're dealing just with notional informative diagram. The BB clearly will include that 401 shall be taken into account, hence, from pragmatic point of view, I don't see any mistake in the WG assessment.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Kind Regards</span> <br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
HE Space Operations for ESA - European Space Agency</span></b> <b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#00A1E0"><br>
Ph.D. Andrea Modenini</span></b><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
Communication Systems & Technologies Engineer</span></b><b><span style="font-size:12.0pt">
</span></b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><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="https://urldefense.us/v3/__http:/www.esa.int/__;!!PvBDto6Hs4WbVuu7!dlWTyv111tTsX17d85u5I5r6V_MZo9fqQxMO5GtJ3x6wC0UwPLcyddXcIs3IOS46VCtc8WVO$"><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#8F8F8F">www.esa.int</span></a><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
T +31 71 56 53439, M +31 6 484 56 527</span> <br>
<br>
<br>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Shames, Peter M (US 312B)" <peter.m.shames@jpl.nasa.gov></span>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Andrea Modenini (external)" <Andrea.Modenini@esa.int></span>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Cc: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Space Link Coding & Synchronization Working Group" <sls-cc@mailman.ccsds.org>, "Enrico Vassallo/esoc/ESA" <Enrico.Vassallo@esa.int>, "Lee, Dennis K (US 332G)" <dennis.k.lee@jpl.nasa.gov>,
"Andrews, Kenneth S (US 332B)" <kenneth.s.andrews@jpl.nasa.gov>, "Hamkins, Jon (US 3300)" <jon.hamkins@jpl.nasa.gov>, "EXTERNAL-Pietras, John V (US 332C-Affiliate)" <john.pietras@gst.com></span>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">26-07-21 23:14</span>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Re: [EXTERNAL] Re: [SLS-CC] VCM technical corrigendum wording (AI_21_01)</span>
<o:p></o:p></p>
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<p style="margin:0in"><span style="font-size:12.0pt">Hi Andrea,</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">Thanks for this feedback. I have heard about this topic from both Ken Andrews and John Pietras. I must say, in all honesty, that I am both not surprised and also disappointed by the choice that the SLS
CC WG has made. I also wonder if the RFM WG would agree with your characterization that the “</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif">RFM Blue Book 401 rather provides a set of requirements to be fulfilled when transmitting at
Radio Frequency, but not a function.</span><span style="font-size:12.0pt">” </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">In fact, that “pseudo protocol stack” diagram from 431, and also 131.0, .1, .2 makes direct reference to “Relationship to OSI Layers”. This is not “functions”, per se, but “OSI layers”. The text above
this figure, in 431.0-B, says:</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt;color:#0082BF">“The synchronization and channel coding sublayer provides methods of synchronization and channel coding for transferring Transfer Frames over a space link while the Physical Layer provides the
RF and modulation methods for transferring a stream of bits over a space link in a single direction.
</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt;color:#0082BF">This Recommended Standard covers functions in both the Synchronization and Channel Coding Sublayer and the Physical Layer. “</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">I think that we would all have to agree that the “functions” in the OSI Layer 1 relative to RF transmission include all of the physical layer aspects required to apply modulation, and to do filtering, signal
shaping, and actual radiation of the RF signal. For VCM we can add “physical layer signaling” to that set of functions. All of these, as far as I can tell, are “functions” of Layer 1.</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">I could quote all of the relevant section of the BRM, ISO 7498, but I suspect you are familiar with them. I will quote the most relevant parts:</span><o:p></o:p></p>
<p style="margin:0in"><b><span style="font-size:12.0pt;color:#0082BF">7.7.3.3. Physical Connections</span></b><o:p></o:p></p>
<p style="margin:0in"><b><span style="font-size:12.0pt;color:#0082BF">7.7.3.3.1 </span>
</b><span style="font-size:10.0pt;color:#0082BF">The Physical Layer provides for the transparent transmission of bit streams between data-link</span><span style="font-size:12.0pt;color:#0082BF">-</span><span style="font-size:10.0pt;color:#0082BF">entities across
physical-connections. </span><o:p></o:p></p>
<p style="margin:0in"><b><span style="font-size:12.0pt;color:#0082BF">7.7.3.3.2 </span>
</b><b><span style="font-size:10.0pt;color:#0082BF">A </span></b><span style="font-size:10.0pt;color:#0082BF">data-circuit is a communication path in the physical media for OSI among two or more physical-entities, together with the facilities necessary in the
Physical Layer for the transmission of bits on it. </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">I think we all know that the BRM does not expressly cover RF communications, nor does it cover optical comms. That said, it does use sufficiently broad language that it is, in my opinion, still an extremely
useful reference. In this case “</span><span style="font-size:10.0pt;color:#0082BF">facilities necessary in the Physical Layer for the transmission of bits</span><span style="font-size:12.0pt">” equates, in my mind, exactly to “modulation, filtering, signal
shaping, and actual radiation of the RF signal”. Whether the term of art is “facilities” or “functions” is a terminology distinction that does not feel like it is worth arguing about. The BRM uses both “function” and “facility” and seems to mean more or
less the same thing in both instances.</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">The last point I will make about this figure 2-1 is that it clearly states that the “VCM Protocol” covers all of the “Physical Layer”, which seems to mean all of OSI Layer 1. I do believe that the VCM includes
some physical layer functions, like a selection of modulations and pilot signals, but not all of them, so I continue to believe that this figure, on the surface of it, is both mis-leading and inaccurate. I also believe that in the absence of the functions,
features, and facilities defined in the CCSDS 401.0-B that you would be lacking the required definitions for several key functions and / or facilities for RF signal radiation, and constraints thereon, that are only documented in CCSDS 401.0-B. </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">My conclusion, therefore, is that if the CCSDS stack does not include, explicitly, CCSDS 401.0-B, there is no complete guidance for RF radiation, and therefore Layer 1 is incomplete.</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">I really wish that you guys would just fix these figures so that this ambiguity is removed. The corresponding figure and text in TM Synch and channel coding, CCSDS 131.0-B, contains no such ambiguity.</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">Thanks, Peter</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><b><span style="font-size:12.0pt">From: </span></b><span style="font-size:12.0pt">"Andrea Modenini (external)" <Andrea.Modenini@esa.int><b><br>
Date: </b>Monday, July 26, 2021 at 12:58 AM<b><br>
To: </b>Peter Shames <peter.m.shames@jpl.nasa.gov><b><br>
Cc: </b>Space Link Coding & Synchronization Working Group <sls-cc@mailman.ccsds.org><b><br>
Subject: </b>Re: [EXTERNAL] Re: [SLS-CC] VCM technical corrigendum wording (AI_21_01)</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear Peter,</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
sorry for the late reply, I have been hold by other activities, and I am also in a personal leave.</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
<br>
Regarding the stack, in our opinion the VCM Blue Book defines also the physical layer function, since it fully specifies the modulations and constellations to be implemented.</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
In this respect, the RFM Blue Book 401 rather provides a set of requirements to be fulfilled when transmitting at Radio Frequency, but not a function.
<br>
<br>
Hence, our preference as WG is to insert the sentences as indicated in my previous email, but to not modify the stack.</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
<br>
Please let us know your opinion, so that we could possible proceed with the WG resolution.</span><span style="font-size:12.0pt">
<br>
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
<br>
Regards</span><span style="font-size:12.0pt"> <br>
<br>
</span><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
<br>
HE Space Operations for ESA - European Space Agency</span></b><span style="font-size:12.0pt">
</span><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#00A1E0"><br>
Ph.D. Andrea Modenini</span></b><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
Communication Systems & Technologies Engineer</span></b><b><span style="font-size:12.0pt">
</span></b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><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="https://urldefense.us/v3/__http:/www.esa.int/__;!!PvBDto6Hs4WbVuu7!d5Sq5RR5u3CiQHi0pPU9SNMfwjuy8mRQK2_zDmvs_G35TZ11GNTO6MRtZEi46MbTmcjuyrPF$"><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#8F8F8F">www.esa.int</span></a><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
T +31 71 56 53439, M +31 6 484 56 527</span><span style="font-size:12.0pt"> <br>
<br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
<br>
From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Shames, Peter M (US 312B)" <peter.m.shames@jpl.nasa.gov></span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Andrea Modenini (external)" <Andrea.Modenini@esa.int>, "Space Link Coding & Synchronization Working Group" <sls-cc@mailman.ccsds.org></span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">07-07-21 21:05</span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Re: [EXTERNAL] Re: [SLS-CC] VCM technical corrigendum wording (AI_21_01)</span><span style="font-size:12.0pt">
</span><o:p></o:p></p>
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<p style="margin-bottom:0in;■x
·■
X)¤"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">Dear Andrea & S&CC WG members,</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">I fully support the idea of aligning all three of the “VCM suite” coding and synch standards. As we have tried to make clear in the updates we are making to the SCCS-ARD, our analysis shows that all three
of these approaches are very nearly identical technically, with only what appear to be modest differences in how they are designed. I do not wish to get into the whole discussion of how we arrived at this situation, only to point out that this is where we
are, and that this is how we view the technical details.</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">In the attached slides I have included, as pgs 2 & 3, the way that we are approaching the description of what we are calling the “VCM Suite” and how we plan to document these relative to the rest of the
S&CC specs as well as how they relate to the several link layer protocols. We reviewed these diagrams during the “SCCS Coordination” meeting that involved SLS, SIS, CSS, and SEA WG and Area leads. And we just discussed these during the follow up SAWG meeting
that Gilles was present at. We agreed to ask your WG for feedback, so I am taking this opportunity to do this.</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">I have also included, on pg 1, a proposed markup of your text and Fig 2-1 from the 431.1 document. We think it will be clearer if this figure, and the associated text, for the 431.1 (and the others in the
VCM Suite) all use the identical figure, and that this figure, and the related text, clearly states that these standards only address the upper part (modulation sub-layer) of the Physical Layer and not the lower sub-layer where the 401.0 document addresses
the RF frequency bands, bandwidth limitations, etc.</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">Please review this feedback and see if you can agree to it. Also, it would be very useful to us if your WG would review the VCM Suite diagrams I have sent and make sure that they are technically correct.</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt">Very best regards, Peter</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><b><span style="font-size:12.0pt">From: </span></b><span style="font-size:12.0pt">SLS-CC <sls-cc-bounces@mailman.ccsds.org> on behalf of "Andrea Modenini (external)" <Andrea.Modenini@esa.int><b><br>
Date: </b>Wednesday, July 7, 2021 at 9:30 AM<b><br>
To: </b>Space Link Coding & Synchronization Working Group <sls-cc@mailman.ccsds.org><b><br>
Subject: </b>[EXTERNAL] Re: [SLS-CC] VCM technical corrigendum wording (AI_21_01)</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear all,</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
I did not receive any comment about the VCM BB from the WG.</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
<br>
However, considering the outcome of the DVB-S2 BB review we had today, I have myself a comment.
<br>
We aligned the SCCC and DVB-S2 BBs for having a sentence that states the need to consider CCSDS 401 BB.</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
On the same line, I would propose to modify Section 2 as provided below (italic part highlights the addition).</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
<br>
You can find in attachment also the word file in tracking-changes mode for your convenience.</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
<br>
Please let me know if there is any objection, or additional point to consider, <u>
no later than 12th July EOB</u>.</span><span style="font-size:12.0pt"> </span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
I will afterward request an Area Resolution for having the technical corrigendum.</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
<br>
Kind Regards,</span><span style="font-size:12.0pt"> </span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Andrea</span><span style="font-size:12.0pt"> <br>
<br>
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
<br>
<br>
-------------</span><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">This Recommended Standard covers functions in both the Synchronization and Channel Coding Sublayer and the Physical Layer<i>, the latter for what concerns the modulation
schemes. CCSDS 401.0-B [5] covers additional features of the Physical Layer like frequency bands, polarizations, etc. that are not described or referenced here.</i></span><span style="font-size:12.0pt">
</span><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
<br>
<br>
HE Space Operations for ESA - European Space Agency</span></b><span style="font-size:12.0pt">
</span><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#00A1E0"><br>
Ph.D. Andrea Modenini</span></b><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
Communication Systems & Technologies Engineer</span></b><b><span style="font-size:12.0pt">
</span></b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><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="https://urldefense.us/v3/__http:/www.esa.int/__;!!PvBDto6Hs4WbVuu7!ZprtUS7KJ1pZpltt-3sln6BkmB--RAe2fXWcA3tewDmnD-hvb2k5FJtUbftvY77dWfg0GNDT$"><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#8F8F8F">www.esa.int</span></a><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
T +31 71 56 53439</span><span style="font-size:12.0pt"> <br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
<br>
<br>
From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Andrea Modenini/estec/ESA</span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Space Link Coding & Synchronization Working Group" <sls-cc@mailman.ccsds.org></span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">10-06-21 17:28</span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">[SLS-CC] VCM technical corrigendum wording (AI_21_01)</span><span style="font-size:12.0pt">
</span><o:p></o:p></p>
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Dear colleagues,</span><span style="font-size:12.0pt"> </span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
<br>
please find enclosed the proposed changes by Jon to the VCM BB discussed during the joint C&S/RFM meeting. Please send your comments before
<b>1st July 2021</b> (if any) directly to John with CC Enrico and I, and C&S mailing list.</span><span style="font-size:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
<br>
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Regards</span><span style="font-size:12.0pt"> </span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Andrea</span><span style="font-size:12.0pt"> </span><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
<br>
<br>
HE Space Operations for ESA - European Space Agency</span></b><span style="font-size:12.0pt">
</span><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#00A1E0"><br>
Ph.D. Andrea Modenini</span></b><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
Communication Systems & Technologies Engineer</span></b><b><span style="font-size:12.0pt">
</span></b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><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="https://urldefense.us/v3/__http:/www.esa.int/__;!!PvBDto6Hs4WbVuu7!ZprtUS7KJ1pZpltt-3sln6BkmB--RAe2fXWcA3tewDmnD-hvb2k5FJtUbftvY77dWfg0GNDT$"><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#8F8F8F">www.esa.int</span></a><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
T +31 71 56 53439</span><span style="font-size:12.0pt"> </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:purple"><br>
----- Forwarded by Andrea Modenini/estec/ESA on 10-06-21 17:25 -----</span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
<br>
From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Jon Hamkins" <Jon.Hamkins@jpl.caltech.edu></span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Andrea Modenini (external)" <Andrea.Modenini@esa.int>, "Enrico.Vassallo@esa.int" <Enrico.Vassallo@esa.int></span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">09-06-21 18:48</span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">VCM technical corrigendum wording (AI_21_01)</span><span style="font-size:12.0pt">
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Andrea, Enrico, <br>
Attached is a draft VCM technical corrigendum in response to AI_21_01 from the C&S WG. I completed this in consultation with Ken Andrews and John Pietras.
<br>
The main changes are in two places: Section 3.2.3 and Section 3.3.2.3 to 3.3.2.4. In summary, with the new wording the randomization is determined by VCM type:
</span><o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:12.0pt">Type 1 (SCCC-like) VCM will randomize the Transfer Frames as the SCCC standard does, using the TM randomizer.</span>
<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:12.0pt">Type 2 (DVB-S2-like) VCM will randomize the sliced encoder-inputs as the DVB-S2 standard does, using the ETSI DVB-S2 baseband scrambler.</span><o:p></o:p></li></ul>
<p class="MsoNormal"><span style="font-size:12.0pt">This will make the CCSDS VCM standard consistent with the 131.2-B-1 and 131.3-B-1 books (SCCC and DVB-S2), with respect to randomization.</span>
<span style="font-size:12.0pt"><br>
These changes are not related to randomization that occurs after encoding. The VCM protocol standard already applies post-encoding randomization, at the physical layer.</span>
<span style="font-size:12.0pt"><br>
Can you forward this message to the RFM and C&S mailing lists along with your guidance on how/when to respond with comments? I believe we agreed to resolve this action by email.</span>
<span style="font-size:12.0pt"><br>
----Jon</span> <span style="font-size:12.0pt"><br>
-- <b><br>
Jon Hamkins</b><br>
Chief Technologist, Communications, Tracking, and Radar Division<b><br>
O</b> 818-354-4764 (preferred) | <b>M</b> 626-658-6220 (does not work at home)<b><br>
<br>
JPL</b> | jpl.nasa.gov [attachment "2021-05-27-VCM-431.1-technical-corrigendum-post-discussion-v3.doc" deleted by Andrea Modenini/estec/ESA]
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<pre>This message is intended only for the recipient(s) named above. It may contain proprietary information and/or<o:p></o:p></pre>
<pre>protected content. Any unauthorised disclosure, use, retention or dissemination is prohibited. If you have received<o:p></o:p></pre>
<pre>this e-mail in error, please notify the sender immediately. ESA applies appropriate organisational measures to protect<o:p></o:p></pre>
<pre>personal data, in case of data privacy queries, please contact the ESA Data Protection Officer (dpo@esa.int).<o:p></o:p></pre>
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