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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Hi John,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">I appreciate your logic John. I consider your additional points post-RIDs that make sense to handle now.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Below in red are my responses.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">I’ve updated the draft USLP blue book to accommodate the following changes in between **…** in red below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">That draft book, with the date, May 23 in the file name is on the SLP CWE at:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><a href="https://cwe.ccsds.org/sls/docs/Forms/AllItems.aspx?RootFolder=%2Fsls%2Fdocs%2FSLS%2DSLP%2FMeeting%20Materials%2F2021%2FSpring%2FRIDs%2FUSLP%20RIDs&FolderCTID=0x012000439B56FF51847E41B5728F9730D7B55F&View=%7BAE8FB44C%2DE80A%2D42CF%2D8558%2DFB495ABB675F%7D">https://cwe.ccsds.org/sls/docs/Forms/AllItems.aspx?RootFolder=%2Fsls%2Fdocs%2FSLS%2DSLP%2FMeeting%20Materials%2F2021%2FSpring%2FRIDs%2FUSLP%20RIDs&FolderCTID=0x012000439B56FF51847E41B5728F9730D7B55F&View=%7BAE8FB44C%2DE80A%2D42CF%2D8558%2DFB495ABB675F%7D</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">I encourage the SLP WG, to review my recommendations below and inform me if you have a difference of opinion by May 31, 2021.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Please also see the details regarding these changes below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Thanks much,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Greg</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><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="color:black">From: </span></b><span style="color:black">SLS-SLP <sls-slp-bounces@mailman.ccsds.org> on behalf of John Pietras <john.pietras@gst.com><br>
<b>Date: </b>Thursday, May 20, 2021 at 4:35 PM<br>
<b>To: </b>"sls-slp@mailman.ccsds.org" <sls-slp@mailman.ccsds.org><br>
<b>Cc: </b>"matteo.renesto@telespazio.de" <matteo.renesto@telespazio.de>, "Holger.Dreihahn@esa.int" <Holger.Dreihahn@esa.int>, Wolfgang Hell <wo_._he@t-online.de><br>
<b>Subject: </b>[EXTERNAL] [Sls-slp] USLP_MC_OCF ambiguities<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal">Members of the SDLP WG,</p>
<p class="MsoNormal">I realize that it is past the time for submitting USLP RIDs, but there are a few requirements that are confusingly stated (to me, at least), and I’d like to get the correct interpretation of their intent. If you agree with my interpretations,
then perhaps the requirements can also be “disambiguated” as part of the update of the Blue Book.</p>
<p class="MsoNormal"> </p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l4 level1 lfo3;text-autospace:none">
<span style="font-size:12.0pt">Paragraph 4.1.5.3 states “If for at least one VC within the MC, the VC managed parameter ‘Inclusion of OCF Required’ is ‘True’, then an OCF shall be included in every USLP Frame of that MC.”<br>
<br>
This implies that if every frame of all VCs on the MC is required to carry an OCF when ‘Inclusion of OCF Required’ is ‘True’ for any *<b>one</b>* VC, then ‘Inclusion of OCF Required’ must equal ‘True’ for *<b>every</b>* VC on the MC. In other words, ‘Inclusion
of OCF Required’ is really a property of the MC, not one (or all) of its VCs. Note that there is no qualification here as to whether the MC and/or VCs carry fixed or variable length frames. If that’s the correct interpretation, then it would seem to make sense
to make ‘Inclusion of OCF Required’ a managed parameter of the MC, not each VC, in which case 4.1.5.3 could be restated<br>
“If MC managed parameter ‘Inclusion of OCF Required’ is ‘True’, then an OCF shall be included in every USLP Frame of that MC.”.</span><o:p></o:p></li></ol>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="color:red">That is the correct interpretation, ‘Inclusion of OCF Required’ is really a property of the MC. When we formulated the requirement, I don’t think this generalization occurred
to us. It makes 4.1.5.3 more succinct. <o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-autospace:none"><span style="font-size:12.0pt;color:red">Now 4.1.5.3 reads: **</span><span style="font-size:12.0pt">“If MC managed parameter ‘Inclusion of OCF Required’ is ‘True’, then an OCF shall be included in every
USLP Frame of that MC.” <span style="color:red">**</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:12.0pt;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;text-autospace:none">
<span style="font-family:"Calibri",sans-serif;color:red">** </span><span style="font-family:"Calibri",sans-serif">That also affected additional changes to 1) add MC managed parameter,
</span>‘Inclusion of OCF Required’ to table 5-2 and remove it from table 5-3; Fixed the note 2 in 4.2.8.2; Fixed the overview in 3.6.1; Fixed the PICS Proforma USLP 116 to say MC in table 2.
<span style="color:red">**</span><br>
<br>
</p>
<ol style="margin-top:0in" start="2" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l4 level1 lfo3;text-autospace:none">
<span style="font-size:12.0pt">Paragraph 4.1.5.4 <span style="color:black">states “If the managed parameter ‘MC Transfer Frame Type’ is</span> ‘Variable Length’ for the subordinate VCs included in that MC, then the following rule applies:</span><o:p></o:p></li></ol>
<ol style="margin-top:0in" start="1" type="a">
<li class="MsoListParagraph" style="margin-left:.25in;mso-list:l2 level1 lfo7;text-autospace:none">
<span style="font-size:12.0pt">for fixed-length VC frames, if the associated VC Managed Parameter, ‘Inclusion of OCF Required’ is set to ‘True’, the OCF shall be included in every USLP Frame; and</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-bottom:12.0pt;margin-left:.25in;mso-list:l2 level1 lfo7;text-autospace:none">
<span style="font-size:12.0pt">for variable-length VC frames, if the associated VC Managed Parameter, ‘Inclusion of OCF Allowed’ is set to ‘True’, the OCF shall be included as desired based upon mission rules.”<br>
<br>
</span><o:p></o:p></li></ol>
<p class="MsoListParagraph" style="text-autospace:none"><span style="font-size:12.0pt">[Aside – should VC Managed Parameter” be VC managed parameter” in bullets (a) and (b)?]
<span style="color:red">We will let Tom Gannett make it all consistent and I will double check it.</span><br>
<br>
As currently stated, bullet (a) seems to be either a redundant subset of 4.1.5.3 or somehow inconsistent with 4.1.5.3 (but I can’t figure out which it is. If (according to 4.1.5.3) every frame of every VC of the MC must contain OCFs when ‘Inclusion of OCF Required’
is set to ‘True’ for *<b>any</b>* VC regardless of the frames are fixed or variable length, then it is unnecessary to restate the same requirement for the fixed length frames on a so-called variable length VC. In that case, 4.1.5.4 could be simplified to
<br>
“<span style="color:black">If the managed parameter ‘VC Transfer Frame Type’ is</span> ‘Variable Length’ and the associated VC managed parameter, ‘Inclusion of OCF Allowed’ is set to ‘True’, the OCF shall be included as desired based upon mission rules.”<br>
(it’s not necessary to state the dependency on the MC being variable-length since the VC can be VL only if the MC is VL).
<span style="color:red">Yes, this is the case.</span><br>
<br>
However, if bullet (a) might be saying that in the case where the variable-length frames are present, only the frames on that VC are required to carry OCFs but not the other VCs on the MC, then that contradicts 4.1.5.3.
<span style="color:red">This is not the case.<o:p></o:p></span></span></p>
<p class="MsoListParagraph" style="margin-left:0in;text-autospace:none"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:0in;text-autospace:none">
<span style="color:red">Bullet a) is redundant. <o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-bottom:12.0pt;text-autospace:none"><span style="color:red">So Now the new 4.1.5.4 is simplified and reads: **
</span><span style="font-size:12.0pt">“<span style="color:black">If the managed parameter ‘VC Transfer Frame Type’ is</span> ‘Variable Length’ and the associated VC managed parameter, ‘Inclusion of OCF Allowed’ is set to ‘True’,
<span style="color:red">then </span>the OCF shall be included as desired based upon mission rules.”<span style="color:red"> **<o:p></o:p></span></span></p>
<p class="MsoListParagraph" style="text-autospace:none"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:0in;text-autospace:none"><span style="font-size:12.0pt">Thanks for any clarification that you can provide.</span></p>
<p class="MsoListParagraph" style="margin-left:0in;text-autospace:none"><span style="font-size:12.0pt"> </span></p>
<p class="MsoListParagraph" style="margin-left:0in;text-autospace:none"><span style="font-size:12.0pt">Best regards,</span></p>
<p class="MsoListParagraph" style="margin-left:0in;text-autospace:none"><span style="font-size:12.0pt">John</span></p>
<p class="MsoNormal"> </p>
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