<span style=" font-size:10pt;font-family:sans-serif">Dear All,</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">please see the
proposal for the DDOR WG in response to my suggestion. If there are no
other comments to the new DDOR recommendation, I would propose we use this
version for the agency review without forgetting that the PN register convention
will continue to be discussed in parallel to the agency review.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Regards, Enrico</span>
<br>
<br><span style=" font-size:9pt;color:#800080;font-family:sans-serif">-----
Forwarded by Enrico Vassallo/esoc/ESA on 26/06/20 11:43 -----</span>
<br>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style=" font-size:9pt;font-family:sans-serif">"Border,
James S (US 335D)" <james.s.border@jpl.nasa.gov></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style=" font-size:9pt;font-family:sans-serif">"Enrico.Vassallo@esa.int"
<Enrico.Vassallo@esa.int></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style=" font-size:9pt;font-family:sans-serif">25/06/20
18:57</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">Re:
[EXTERNAL] CCSDS RFM WG AI_20-01 (PN register convention)</span>
<br>
<hr noshade>
<br>
<br>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri">Dear
Enrico,</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri">I
am sending an update to 2.5.7B-W-4. The only change is that Chris
Volk added explanation similar to what is in your Document 1 below the
code generator figures in Annex A. </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri">Best
Regards,</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri">Jim</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt;font-family:Calibri"><b>From:
</b>"Vassallo.Enrico" <Enrico.Vassallo@esa.int><b><br>
Date: </b>Monday, June 22, 2020 at 2:32 AM<b><br>
To: </b>"sls-rfm@mailman.ccsds.org" <sls-rfm@mailman.ccsds.org>,
James Border <james.s.border@jpl.nasa.gov><b><br>
Cc: </b>"Massimo.Bertinelli@esa.int" <Massimo.Bertinelli@esa.int>,
"Kazz, Greg J (US 312B)" <greg.j.kazz@jpl.nasa.gov><b><br>
Subject: </b>[EXTERNAL] CCSDS RFM WG AI_20-01 (PN register convention)</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:240px"><span style=" font-size:10pt;font-family:Arial">Dear
All,</span><span style=" font-size:11pt;font-family:Calibri"> <br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
please find my response <b>as both ESA representative in RFM WG and as
RFM WG chair</b> to the action item:</span><span style=" font-size:11pt;font-family:Calibri">
<br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
AI_20-01 Report about the PN register proposal
in CS_20-03, the possible need to have a similar standard representation
and, in case, the preferred way forward</span><span style=" font-size:11pt;font-family:Calibri">
<br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
Input paper CS_20-03 recommends changes to the following RFM WG books:
</span><span style=" font-size:11pt;font-family:Calibri"><br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
1) 415.1-B-1, dated 2011</span><span style=" font-size:11pt;font-family:Calibri">
<br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
2) 415.1-G-1, dated 2013</span><span style=" font-size:11pt;font-family:Calibri">
<br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
3) 401.1-B REC 2.5.7B-white</span><span style=" font-size:11pt;font-family:Calibri">
<br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
Document CS_20-03 proposes to adopt the Matlab convention. <br>
Main differences between what's in documents 1-3 and the proposal in CS_20-03
is the fact that in the pictures the output register is numbered N in 1-3
as opposed to 0 in the proposal; additionally, the first register is numbered
1 (zero is not used in 1-3).</span><span style=" font-size:11pt;font-family:Calibri">
<br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
Documents 1-2-3 are consistent. <br>
Document 2 (green book) provides in page 3-3 a detailed explanation of
the convention used, addresses different conventions in literature, and
links the drawing of the picture with resulting equations and polynomials.
This info is in sections 3.4 to 3.8.</span><span style=" font-size:11pt;font-family:Calibri">
</span><span style=" font-size:10pt;font-family:Arial"><br>
Document 1 (blue book) provides some explanation of the convention used
in section 1.6.2.</span><span style=" font-size:11pt;font-family:Calibri">
</span><span style=" font-size:10pt;font-family:Arial"><br>
Document 3 has two pictures in Annex A with no explanation while the polynomials
are in the main body of the recommendation. </span><span style=" font-size:11pt;font-family:Calibri"><br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
Documents 1-2 were mainly NASA's (GFSC) inputs aimed at extending the SNIP
agreement (latest version from 1998) between ESA, NASA and NASDA (now JAXA)
for which the latest version dates November 1998 to encompass more CCSDS
agencies.</span><span style=" font-size:11pt;font-family:Calibri"> <br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
The change request in CS_20-03 would entail editing the following number
of pictures: 5 (doc 1) + 10 (doc 2) + 2 doc (3) = 17 in addition to adjusting
the related text.</span><span style=" font-size:11pt;font-family:Calibri">
<br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
Given that documents 1 and 2 have been used for almost a decade with no
report of implementation mistakes by ESA equipment developers, and the
changes in CS_20-03 would result in full disagreement with the SNIP document,
it is proposed NOT to adopt the Matlab convention for the RFM WG books.
However, concerning the draft DDOR recommendation 2.5.7B under development,
some explanation could be added as done in 1 (or even in 2.)</span><span style=" font-size:11pt;font-family:Calibri">
<br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
It is possible that other WGs of the SLS area may prefer a different approach
for their books but as long as the recommendations of the same WG are consistent,
I do not see this as an issue.</span><span style=" font-size:11pt;font-family:Calibri">
<br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
Best Regards, Enrico </span></p>
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