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<p class="MsoNormal"><span style="font-size:11.0pt">Dear SAWG members,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">During the joint SAWG / MOIMS / SOIS meeting on Wednesday we spent quite some time discussing the draft document that SOIS produced comparing MO Services (based on the MAL) and SOIS EDS. This is a Yellow
Book, CCSDS 870.10-Y-0, titled "MO SERVICES AND SOIS ELECTRONIC DATASHEETS". The MOIMS AD identified a series of conditions that were written into the body of the PDF. It did not appear that the MOIMS and SOIS were going to reach agreement on the disposition
of these comments without some help, so I volunteered to provide an analysis on behalf of SEA. I want to enlist you in making sure that this is fair and balanced.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I am also adding Richard Melvin and Sam Cooper to this list, since Richard was the author of the document and Sam was the primary MOIMS point of contact. I ask them to put their "SAWG hats on" and participate
in as unbiased a way as they are capable of, while offering any technical clarity and accuracy is needed. In this they are supplemented, of course, by Roger and Ray.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The first thing to say about this analysis is this:<o:p></o:p></span></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">We have the ASL document and our own analyses and discussions of the suite of standards to draw upon<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">We have agreed, among ourselves and in this joint meeting, that there are three stages of MOIMS deployment into the on-board environment<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Both of these are background and criteria for providing feedback. The three stages
</span><span style="font-size:11.0pt">were stated during the joint meeting and they are repeated here for reference</span><span style="font-size:11.0pt">:<o:p></o:p></span></p>
<ol start="1" type="1">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo2">
<span style="font-size:11.0pt">SOIS device interfaces, subnets, and services on-board with the usual Real Time flight software and resource constraints, MOIMS only on ground, typical TT&C interfaces between them<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo2">
<span style="font-size:11.0pt">Same SOIS services and RT FSW on-board, MOIMS Proxy interfaces to RT FSW on-board, "MAL" interfaces over TT&C<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo2">
<span style="font-size:11.0pt">Same SOIS services and RT FSW on-board, MOIMS MAL adapted to RT environment and "standard" MOIMS services migrated on board as appropriate<o:p></o:p></span></li></ol>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">Attached is the modified draft
</span><span style="font-size:11.0pt">CCSDS 870.10-Y-0 document, in PDF form. It has three kinds of notes in it:<o:p></o:p></span></p>
<ol start="1" type="1">
<li class="MsoListParagraph" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:0in;mso-list:l2 level1 lfo3">
<span style="font-size:11.0pt">Notes that show up as a white square came from MOIMS<o:p></o:p></span></li><li class="MsoListParagraph" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:0in;mso-list:l2 level1 lfo3">
<span style="font-size:11.0pt">Notes that show up as a yellow square with a "thought bubble" also came from MOIMS<o:p></o:p></span></li><li class="MsoListParagraph" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:0in;mso-list:l2 level1 lfo3">
<span style="font-size:11.0pt">Notes that show up as a <b><span style="color:#FF40FF">magenta square</span></b>, are comments from me as to responses and rationale<o:p></o:p></span></li><li class="MsoListParagraph" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:0in;mso-list:l2 level1 lfo3">
<span style="font-size:11.0pt">Notes that show up as a <b><span style="color:red">red square</span></b><span style="color:red">
</span>are suggested changes to the draft document, many in response to MOIMS issues, some reflecting issues I found in reading the document<o:p></o:p></span></li></ol>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">You will see that I recommend adding text to reflect the three stages we have agreed to, even though that is new material from the SAWG. I think
it will help to clarify the options relating to deployment. Some of the MOIMS comments attempt to push boundaries and I suggest that not be allowed. Existing scope, functions, and standards are to be respected. Some MOIMS comments propose on-board services,
like MO compliant device interfaces, that are very speculative. I think that they should be labelled as such since there are no MOIMS documents that can be referenced. The current work in SOIS to define use of EDS to document deployments of components and
spacecraft configurations, however, is within scope since they are actively working on that. I also found that this document, in general, is lacking a recognition of the importance of specifying interface bindings along with behaviors and data structures.
I recommend that it gets added.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">Please review these MOIMS comments and my proposed dispositions. I would like to have your feedback in two weeks, by 9 November, if not sooner.
This has dragged on long enough. Assuming we can reach consensus I will then send the final result to the combined MOIMS and SOIS teams. I will provide final edits to the document in Word form once we have closure.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">While we are working together to reach consensus I ask that you all treat these materials, and the discussion, as SAWG internal work product.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">Thanks, Peter<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p></o:p></span></p>
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