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<p class="MsoNormal">Dear CCSDS AD and WG chairs,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The Space Communications Cross Support Architecture document (SCCS-ARD) is a cross-cutting Magenta Book that largely covers the SLS, SIS, CSS, and SEA areas and their working groups. We have being working on an update to this document
that primarily covers what are called “ABA” mission configurations, which are those that involve a single mission ops center, a single spacecraft, and a ground station. The Solar System Internet (SSI) configurations, which involve multiple spacecraft, mission
centers, and comm assets, and use the DTN (or IP) protocols, will be in a future update that builds on this foundation.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There have been a number of changes to the CCSDS standards landscape since the last edition was published. These include:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">USLP protocol<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">The “VCM suite” of variable coding and modulation standards<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">New CSTS services<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">New Service Management services<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Updates to the Synch and Channel coding specs, the liberal approaches<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">New security features in several sections<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In addition to these new / updated standards we wish to address the following issues as well:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Improved handling of cross references from the Services viewpoint to the protocol stack details (interface binding signatures)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Revised section structures and cross referencing<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Inclusion of “recommended” options and clarification of optional and mandatory features<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Discussion of incomplete / optional capabilities like forward file service, handling of details of complexities like MAP service and VC/MC multiplexing, COP on the USLP return link,
and CADUs in FF-CSTS given new Pseudo-randomized “Only Idle Data” (OID) frames<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please go to this Doodle poll and pick one or more dates that work for you.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="https://doodle.com/poll/k76scstevu66qhzd?utm_source=poll&utm_medium=link">https://doodle.com/poll/k76scstevu66qhzd?utm_source=poll&utm_medium=link</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks, Peter Shames & John Pietras<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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