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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Keith,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">As also stated by other people in previous e-mail, I also concur with retiring the book since the SCPS-TP is not planned for use in current or planned future
missions. Furthermore, I also have the impression that the use of SCPS-TP in terrestrial applications (e.g., TCP accelerators for use in geostationary satellite networks) is going a little bit down, since proprietary solution or other more favourable TCP enhancements
are being used.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Nevertheless, as you correctly pointed out, the fact that SCPS-TP will be “silverised” does not imply that the protocol itself will be killed since SCPS-TP
options (e.g., SNACK) will stay in IANA registries.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Tomaso<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:dimgray">————————————————————————</span><span style="color:#1F497D">
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</span><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:dimgray">Deutsches Zentrum für Luft- und Raumfahrt</span></b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:dimgray"> (DLR)</span><span style="color:#1F497D">
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</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:dimgray">German Aerospace Center</span><span style="color:#1F497D">
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</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:dimgray">Institute of Communications and Navigation | Satellite Networks | Oberpfaffenhofen | 82234 Wessling | Germany</span><span style="color:#1F497D">
<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="IT" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:dimgray">Tomaso de Cola, Ph.D.</span></b><span lang="IT" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
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</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:dimgray">Telefon +49 8153 28-2156 | Telefax +49 8153 28-2844 |</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="mailto:tomaso.decola@dlr.de"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">tomaso.decola@dlr.de</span></a>
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</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><a href="http://www.dlr.de/kn/institut/abteilungen/san">http://www.dlr.de/kn/institut/abteilungen/san</a></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> sis-dtn-bounces@mailman.ccsds.org [mailto:sis-dtn-bounces@mailman.ccsds.org]
<b>On Behalf Of </b>Scott, Keith L.<br>
<b>Sent:</b> Monday, February 01, 2016 14:57<br>
<b>To:</b> scps-interest@mailman.ccsds.org<br>
<b>Cc:</b> sis-dtn@mailman.ccsds.org; sis-cfdpv1@mailman.ccsds.org<br>
<b>Subject:</b> [Sis-dtn] CCSDS Notification -- Renew / Retire / Update SCPS-TP specification in CCSDS<br>
<b>Importance:</b> High<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Greetings,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">The SCPS-TP specification is again overdue for reconfirmation within CCSDS. At this time we have the opportunity to:<o:p></o:p></span></p>
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<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<b><span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">RENEW</span></b><span style="font-size:10.5pt;font-family:"Calibri","sans-serif""> the specification for another 5 years — essentially leaving it as-is.<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<b><span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">RETIRE</span></b><span style="font-size:10.5pt;font-family:"Calibri","sans-serif""> the specification to ‘<a href="http://public.ccsds.org/publications/SilverBooks.aspx">silver</a>’ status
— it will remain accessible via the CCSDS website but will no longer be considered an ‘active’ CCSDS Specification
<o:p></o:p></span></li></ol>
<ol start="2" type="1">
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<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo1">
<span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">We did this already with the
<a href="http://public.ccsds.org/publications/archive/713x0b1s.pdf">SCPS-NP</a>, <a href="http://public.ccsds.org/publications/archive/713x5b1sc1.pdf">
SCPS-SP,</a> and <a href="http://public.ccsds.org/publications/archive/717x0b1s.pdf">
SCPS-FP</a> protocols.<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo1">
<span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">SCPS-TP is not used in any known space missions.<o:p></o:p></span></li></ul>
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<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<b><span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">UPDATE</span></b><span style="font-size:10.5pt;font-family:"Calibri","sans-serif""> the specification — make changes to it.
<o:p></o:p></span></li></ol>
<ol start="3" type="1">
<ul type="circle">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo1">
<span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Note that updating the specification would require securing resources from two CCSDS member agencies, which would be very difficult unless there is a compelling need.<o:p></o:p></span></li></ul>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">CCSDS has maintained the SCPS-TP specification mainly as a service to the terrestrial community using it. As noted above, SCPS-TP has not been deployed in space
missions and within CCSDS is being supplanted by the combination of TCP and the IP suite (where the IP suite can function well) and the BP suite (where the IP suite doesn’t function well).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">The activity of determining what to do with the specification will be undertaken by the SIS area and discussed briefly during the SIS-DTN portion of the Spring
meetings in Cleveland week of 4 April.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:red">What I am interested in now are opinions from the community as to the three options above. In particular, does anyone see a need for CCSDS to maintain the ‘active’
status of SCPS-TP? Again, retiring the specification within CCSDS will NOT cause it to disappear, NOR will it change the fact that the TCP options that implement the signaling for SCPS-TP will remain defined in IANA.</span></b><span style="font-size:10.5pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">V/r,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">—keith<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">Dr. Keith Scott</span></b><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">
<span class="apple-tab-span"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">Office: +1.703.983.6547</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">Chief Engineer, J86A <span class="apple-tab-span"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">Fax: +1.703.983.7142</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">Communications Network Engineering & Analysis<span class="apple-tab-span"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">Email: <a href="mailto:kscott@mitre.org"><span style="color:#954F72">kscott@mitre.org</span></a></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:black"><a href="http://www.mitre.org/"><span style="color:#954F72">The MITRE Corporation</span></a></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">M/S H300</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">7515 Colshire Drive</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">McLean, VA 22102</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">Area Director,</span><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:black"> <a href="http://www.ccsds.org/"><span style="color:#954F72">CCSDS</span></a> <a href="http://cwe.ccsds.org/sis/default.aspx"><span style="color:#954F72">Space
Internetworking Services</span></a></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:black"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#595959">MITRE self-signs its own certificates. Information about the MITRE PKI Certificate Chain is available from <a href="http://www.mitre.org/tech/mii/pki/"><span style="color:#954F72">http://www.mitre.org/tech/mii/pki/</span></a></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
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<span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><a href="http://www.mitre.org/"><span style="text-decoration:none"><img border="0" width="168" height="29" id="_x0000_i1025" src="cid:image001.png@01D15D9A.1342D9B0"></span></a><span style="color:black"><o:p></o:p></span></span></p>
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