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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Dear SCCS-ARD sub-group.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">This is just a short reminder that we will be holding the SEA-SA Webex on Monday, 3 May. The Agenda is to continue review of the updates to the doc that John has prepared. A key focus will be
the emails that John, Gippo, and others have exchanged relating to how to describe the three different, but related, Variable Coding and Modulation (VCM) approaches that are now standardized. These have the property of shifting the boundaries between CCSDS
identified “data link layer” and “physical layer” sub-layers, as well as adding new physical layer signaling structures.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">There have been some continuing side discussions involving some of the SLS Area folk. After discussing the complexity that this adds to what would otherwise be a pretty normal set of protocols
layers I still believe that we need two separate diagrams, one that shows “normal stuff” and the other that includes all of these “complexifications”. I do not want to complicate the “mainline” discussion with all of this complexity, so I would choose to
sequester it in its own “high rate VCM” section that covers SCCC, DVB-S2, and VCM. I do agree that the CCSDS VCM, as written, is a sort of “overview” of all three standards.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hope to see you all then.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Peter</span><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">PS – I will shortly resend the WebEx appointment info for these standing monthly meetings for anyone who does not have it. We do not plan to have a “Working Meeting” during the normally scheduled CCSDS working sessions, but I am trying
to schedule a special coordination session with our SLS, SIS, and CSS colleagues to review the changes we are working on.<o:p></o:p></p>
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