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<p class="MsoNormal"><span style="color:black">Dear SAWG colleagues – SCCS-ARD subset,<o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">John Pietras has posted an update of the ARD that covers the points that we discussed and agreed on at the webex session earlier this month. These are in the CWE at:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<span style="color:black"><a href="https://urldefense.us/v3/__https:/cwe.ccsds.org/sea/docs/SEA-SA/Draft*20Documents/SCCS-ARD-ADD*20Revisions*202020/SCCS-ARD*20draft*20documents/SCCS-ARD-901x1p1_4-210127.doc?d=w1ea0ee328e40412c85994bac8c5079b1__;JSUlJSU!!PvBDto6Hs4WbVuu7!Ya7NHcZ0EhCLM9i0c4sj-kii7h8RXsxGJ8DWGcZM5LW_h5-tmsp9Ngm3N9USruT-hZTKqrMp$"><span style="color:#954F72">https://cwe.ccsds.org/sea/docs/SEA-SA/Draft%20Documents/SCCS-ARD-ADD%20Revisions%202020/SCCS-ARD%20draft%20documents/SCCS-ARD-901x1p1_4-210127.doc?d=w1ea0ee328e40412c85994bac8c5079b1</span></a><o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">There have been discussions related to this SCCS-ARD central topic in the weeks since the last meeting. These cover the FRM and EDS, and a special working meeting on the forward / return file service. Those support
materials have been written to the SCCS-ARD CWE site in the Background Materials folder:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">https://cwe.ccsds.org/sea/docs/Forms/AllItems.aspx?RootFolder=%2Fsea%2Fdocs%2FSEA%2DSA%2FDraft%20Documents%2FSCCS%2DARD%2DADD%20Revisions%202020%2FSCCS%2DARD%20background%20materials&FolderCTID=0x012000F83FD93BEFF45E4FB5D1769B01CA762F&View=%7BA709F322%2D0E67%2D45C7%2D932D%2DCB78C55CE268%7D<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">For the 1 Feb meeting there are more observations and questions about how the ABA ESLT Service Provider Building Block requirements (i.e., 6.2.2.1.1 and on) are currently phrased. Basically, the way they are currently
stated they, too, don’t scale up well with the availability more “parallel” CCSDS standards. John would like to discuss those and make some suggested changes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">The agenda topics are:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">1. Review the recent updates to sections 4.2, the tables in section 6.2.1.2, and the building block diagrams in section 6.2.2.1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">2. Discuss restructuring/rephrasing of building block requirements in section 6<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">3. AOB<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Please see below the final</span> <span style="color:black">minutes from the 6 Jan 2021 meeting.
<o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
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<span style="color:black">Thanks, Peter<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
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<span style="color:black"> ====================================================================================================================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<b><span style="color:black">SCCS-ARD<span class="apple-converted-space"> </span>Revision Meeting Notes, 6 Jan 2021</span></b><span style="color:black"><o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
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<u><span style="color:black">Attendees: Peter Shames, John Pietras, Ramon Krosley, Yonghui Huang, Costin Radulescu</span></u><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black"> <o:p></o:p></span></p>
<ul style="margin-top:0in;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px" type="disc">
<li class="MsoNormal" style="color:black;mso-list:l0 level1 lfo1">Reviewed the “Issues” file that John Pietras prepared (see<span class="apple-converted-space"> </span>SCCS-ARD_Update-210104 file in CWE), including the overview of the proposed work and intended
fixes.<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-list:l0 level1 lfo1">Specific issues were identified for three sections of the document. These are covered in the file and are just named here for reference, along with an decisions made during discussion: <o:p></o:p>
<ul style="margin-top:0in" type="circle">
<li class="MsoNormal" style="color:black;mso-list:l0 level2 lfo1">Sec 4: agreed to revise the style in which contents are presented, as suggested by John. This will result in the details of relevant protocol stacks to be moved to Sec 6 and just forward<span class="apple-converted-space"> </span>referenced
in Sec 4.<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-list:l0 level2 lfo1">Sec 6: Modified approach to use two sets of tables.<o:p></o:p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="color:black;mso-list:l0 level3 lfo1">Mappings of services to protocols (used for cross references from section 4)<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-list:l0 level3 lfo1">Mappings of production functionality to protocols (used for cross references from section 5)<o:p></o:p></li></ul>
</li><li class="MsoNormal" style="color:black;mso-list:l0 level2 lfo1">Adopted other changes to Sec 6 protocol tables as discussed. This includes splitting out SLE/CSTS separate from the CFDP/TGFT protocols, largely because these are different in kind. Also agreed
to other detailed changes in the handling of SCCC and DVB coding and modulation, since they are distinct from the “mainline” CCSDS coding, synch, and modulation standards.<o:p></o:p></li></ul>
</li><li class="MsoNormal" style="color:black;mso-list:l0 level1 lfo1">During the meeting we also discussed a couple of related topics, as follows:<o:p></o:p>
<ul style="margin-top:0in" type="circle">
<li class="MsoNormal" style="color:black;mso-list:l0 level2 lfo1">There is a push to not just incorporate a new “CFDP File Delivery Service”, which puts the CFDP agent into the ESLT, but also to augment that with a new kind of “lost segment signaling” and “retransmission
request signaling” between the CFDP agent in the ESLT and the Earth User Node (EUN). These added signals, and the TGFP adaptation, constitute a whole new set of protocols which as, as yet, largely undefined.<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-list:l0 level2 lfo1">A separate request was made to the CSS and other areas involved in this to try and reach some clarity as to whether this really makes sense and just what is proposed, or planned. As separate
discussion is being scheduled. <span class="apple-converted-space"> </span><o:p></o:p></li><li class="MsoNormal" style="color:black;mso-list:l0 level2 lfo1">It was noted that the kinds of configuration and control information that must be exchanged in order to make this CFDP File Delivery service work, given that it involves creating CFDP PDUs, packetizing
them, creating data link frames, and encoding them in the ground station, starts to look a lot like the sorts of processing described in the DTN Last Hop and First Hop services described earlier. Those papers have been placed in the Background Materials folder
for reference.<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-list:l0 level2 lfo1">The question of whether it makes sense to invest CCSDS resources in developing this new, rather restricted, new set of protocols or of that effort should go into refining the use of CFDP over
DTN instead, which is a solid path into the future for a broader range of missions.<o:p></o:p></li></ul>
</li><li class="MsoNormal" style="color:black;mso-list:l0 level1 lfo1">Several other topics were briefly discussed at the beginning, and during, the meeting:<o:p></o:p>
<ul style="margin-top:0in" type="circle">
<li class="MsoNormal" style="color:black;mso-list:l0 level2 lfo1">Recognize that work must be done to sort out the relationships between the CSS Functional Resource Model (FRM), which was characterized as a database of knowledge about component functions that
get assembled to provide services, and the SOIS Electronic Data Sheet (EDS), which was characterized as a way to document hardware and software component interfaces so as to facilitate development of software for those interfaces. <span class="apple-converted-space"> </span><o:p></o:p></li><li class="MsoNormal" style="color:black;mso-list:l0 level2 lfo1">Recognize that work must be done to disambiguate the different ‘flavors” of “service”: as in CSS services, arbitrary “application services” like packet transfer without formal application layer
protocols, protocol layer Service Access Points (SAP), SM&C “Services”, service interface binding signatures, and the related protocol stacks that implement service transfers. Focus is to be on services, protocols, and interfaces and not on implementations.<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-list:l0 level2 lfo1">Discussed the effect of the relatively new Q-SCID specs, from CCSDS 320.0-M-7, and the new USLP protocol with its 16-bit SCID, on the existing SLE and CSTS protocols. This is apparently being
addressed within the CSS area.<o:p></o:p></li></ul>
</li></ul>
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<span style="color:black"> <o:p></o:p></span></p>
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<span style="color:black">The files for review, and any added / background materials, will be placed in the CWE at:<span class="apple-converted-space"> </span></span><u><span style="color:#0563C1"><a href="https://urldefense.us/v3/__https:/cwe.ccsds.org/sea/docs/Forms/AllItems.aspx?RootFolder=*2Fsea*2Fdocs*2FSEA*2DSA*2FDraft*20Documents*2FSCCS*2DARD*2DADD*20Revisions*202020&View=*7BA709F322*2D0E67*2D45C7*2D932D*2DCB78C55CE268*7D&&InitialTabId=Ribbon*2EDocument&VisibilityContext=WSSTabPersistence*20__;JSUlJSUlJSUlJSUlJSUlJSUlJQ!!PvBDto6Hs4WbVuu7!dkq2FeTLx9sqJswtaTiN_Nv7x6sENZfbDvsYuqOYjkc9OVxL4cehx4WH3MeU4GQYNshqouU5$"><span style="color:#0563C1">https://cwe.ccsds.org/sea/docs/Forms/AllItems.aspx?RootFolder=%2Fsea%2Fdocs%2FSEA%2DSA%2FDraft%20Documents%2FSCCS%2DARD%2DADD%20Revisions%202020&View=%7BA709F322%2D0E67%2D45C7%2D932D%2DCB78C55CE268%7D&&InitialTabId=Ribbon%2EDocument&VisibilityContext=WSSTabPersistence</span><span class="apple-converted-space"><span style="color:#0563C1;text-decoration:none"> </span></span></a></span></u><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<u><span style="color:black">Action Items:</span></u><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black">=> Next telecon, 1 Feb 2021: Review the refined approach for Sec 4 and Sec 6, to be produced by John Pietras, incorporating the agreed changes.<o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black">=> Peter Shames to setup a separate working session, with CSS, SLS, SIS and SEA, to look into the issues around the proposed CFDFP File Delivery service , as discussed above, and the DTN alternative.<o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black">=> Peter has set up sub-folders for background, draft docs, and working meeting<span class="apple-converted-space"> </span>minutes<o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black">=> Request for the team to familiarize with these background materials<o:p></o:p></span></p>
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<span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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