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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Dear Gippo,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">I appreciate your attention to detail and looking at this early on, but I have to differ re some conclusions. I note the following:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-bottom:12.0pt;text-indent:-.25in;line-height:18.0pt;mso-list:l1 level1 lfo2;text-autospace:none">
<![if !supportLists]><span style="font-family:Calibri"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:Calibri">The term GSCID was defined
</span><span style="font-family:Calibri">as “</span><span style="font-family:Times">GSCID = VN
<b><span style="position:relative;top:-4.0pt;mso-text-raise:4.0pt">. </span></b>SCID”</span><span style="font-size:11.0pt;font-family:Calibri"> where the “</span><b><span style="font-family:Times;position:relative;top:-4.0pt;mso-text-raise:4.0pt">.</span></b><span style="font-size:11.0pt;font-family:Calibri">”
means concatenation.</span><span style="font-family:Times"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-bottom:12.0pt;text-indent:-.25in;line-height:18.0pt;mso-list:l1 level1 lfo2;text-autospace:none">
<![if !supportLists]><span style="font-family:Calibri"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:Calibri">The terms SCID and GSCID are used more or less interchangeably in the CCSDS 320x0b document, but they mean different things. This is a flaw in the current document that I have
tried to remedy.</span><span style="font-family:Times"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-bottom:12.0pt;text-indent:-.25in;line-height:18.0pt;mso-list:l1 level1 lfo2;text-autospace:none">
<![if !supportLists]><span style="font-family:Calibri"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:Calibri">The term SCID is defined specifically in the various protocol documents, 320x0 just references it.</span><span style="font-family:Times"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-bottom:12.0pt;text-indent:-.25in;line-height:18.0pt;mso-list:l1 level1 lfo2;text-autospace:none">
<![if !supportLists]><span style="font-family:Calibri"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:Calibri">The term GSCID
<b><i>does not</i></b> appear in any of our protocol documents, TC, TM, or AOS. They tend to call the combination of the VN (actually the TFVN) and the SCID an MCID, not a GSCID.</span><span style="font-family:Times"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-bottom:12.0pt;text-indent:-.25in;line-height:18.0pt;mso-list:l1 level1 lfo2;text-autospace:none">
<![if !supportLists]><span style="font-family:Calibri"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:Calibri">If you search the CCSDS files you will find that the only reference to GSCID is in this 320x0 document, and not in any others.</span><span style="font-family:Times"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:18.0pt;text-autospace:none">
<span style="font-size:11.0pt;font-family:Calibri">All of that said, I think that there is really no impediment in the way of extending the definition of GSCID to include the frequency band, because globally, in fact, the frequency band has from the beginning
been a part of the actual physical and logical link layer signal. We just did not acknowledge this until now.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:18.0pt;text-autospace:none">
<span style="font-size:11.0pt;font-family:Calibri">But if you are worried about some confusion for others we could introduce a new term for the FB
</span><b><span style="font-family:Times;position:relative;top:-4.0pt;mso-text-raise:4.0pt">.
</span></b><span style="font-size:11.0pt;font-family:Calibri">VN </span><b><span style="font-family:Times;position:relative;top:-4.0pt;mso-text-raise:4.0pt">.
</span></b><span style="font-size:11.0pt;font-family:Calibri">SCID combination. I’m reluctant to call it a “Super” SCID, that sounds like a kid’s toy. ;-} And in truth, I think that this is more of a Global SCID than the current definition, and which the
protocol docs call an MCID. In effect we have given the same thing two different names, surely that is not a good approach? Maybe we should align this book with all of the existing protocol docs and call the VN
</span><b><span style="font-family:Times;position:relative;top:-4.0pt;mso-text-raise:4.0pt">.
</span></b><span style="font-size:11.0pt;font-family:Calibri">SCID combo an MCID and the FB
</span><b><span style="font-family:Times;position:relative;top:-4.0pt;mso-text-raise:4.0pt">.
</span></b><span style="font-size:11.0pt;font-family:Calibri">VN </span><b><span style="font-family:Times;position:relative;top:-4.0pt;mso-text-raise:4.0pt">.
</span></b><span style="font-size:11.0pt;font-family:Calibri">SCID combo the GSCID?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:18.0pt;text-autospace:none">
<span style="font-size:11.0pt;font-family:Calibri">I am open to other suggestions.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:18.0pt;text-autospace:none">
<span style="font-size:11.0pt;font-family:Calibri">Regards, Peter<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:18.0pt;text-autospace:none">
<span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black">CESG <cesg-bounces@mailman.ccsds.org> on behalf of Gian Paolo Calzolari <Gian.Paolo.Calzolari@esa.int><br>
<b>Date: </b>Tuesday, July 12, 2016 at 6:18 AM<br>
<b>To: </b>CCSDS Engineering Steering Group - CESG Exec <cesg@mailman.ccsds.org><br>
<b>Cc: </b>Tom Gannett <thomas.gannett@tgannett.net><br>
<b>Subject: </b>[CESG] Why renaming GSCID inf revised CCSDS SCID Code Assignment Control Procedures?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<blockquote style="border:none;border-left:solid #B5C4DF 4.5pt;padding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-right:0in" id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE">
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<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif","serif"">Dear CESGers,</span>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""> in order to gain time and not to delay eventual Poll and start of Agency Review, I would like to anticipate that as SLS AD I wonder about the need of renaming GSCID in revised CCSDS SCID
Code Assignment Control Procedures.</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">In fact the revised book includes a new definition of GSCID (see snapshot) that is conflicting with the definition in the Blue Book in force (see second snapshot) as the new one also refers to
Frequency Band.</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">First of all I think that it is not appropriate modifying a term used for so many years (and for sure spread in "billions" of documents from many agencies) also considering that the the prefix
"Global" is widely used for e.g. the Global VCID and Global MAP ID (for sure in SLE and SLS books) without considering the Frequency Band.</span>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">Therefore there would be a discrepancy of meaning about the term Global between the GSCID and the GVCID</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">Last, but not list the book title "CCSDS Global Spacecraft Identification Field" points to a field i.e. a portion of data that is normally contained in transfer frames. In other words while the
actual GSCID matches completely the contents of some bits of a Frame Header, the proposed future GSCID will not.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">As a conclusion I would retain the current definition of GSCID while adding a new definition for the concatenation of the frequency band (FB), 2-bit Version Number (VN) and the SCID.</span>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">This could be called Universal SCID, Super SCID, Supreme SCID, Frequenced SCID or whatever you prefer. [Please consider some humour in some proposed definitions.]</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">Regards</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">Gian Paolo</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">PS Of course I did not perform a complete review of the document.......</span>
<br>
<br>
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