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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Gippo,<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">I too noted that it might be possible to interpret 3.5.1.3 as already allowing removal of the decimal fraction/sub-second. <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">CESG members,<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">What is your taking/reading on this? Does this already allow fractional seconds to be optional? If not, why not?
<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">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Erik<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"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Gian.Paolo.Calzolari@esa.int [mailto:Gian.Paolo.Calzolari@esa.int]
<br>
<b>Sent:</b> Monday, July 25, 2016 2:26 AM<br>
<b>To:</b> Barkley, Erik J (3970) <erik.j.barkley@jpl.nasa.gov><br>
<b>Cc:</b> CESG -- CCSDS-Engineering Steering Group (cesg@mailman.ccsds.org) (cesg@mailman.ccsds.org) <cesg@mailman.ccsds.org><br>
<b>Subject:</b> Re: [CESG] CCSDS 301.0-B-4 propsed pink sheet (Time Code B) / Backward compatibility?<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Erik,</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"> from a purist point of view I think that it would be incorrect stating that the change is backward compatible as a former implementation would expect to find always the "</span>Decimal fraction
of second<span style="font-size:10.0pt;font-family:"Arial",sans-serif">" and would most likely crashes when that field is absent.</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Conversely a constant setting to 0 when not used would be fully backward compatible.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">However it is also true that despite section 3.5.1.2 "ASCII TIME CODE B, Year/Day of Year Calendar Variation" defines only one optional field (i.e. the time code terminator) section 3.5.1.3 "SUBSETS
OF THE COMPLETE TIME CODES" basically allows many fields to be optional so I wonder whether it would be more correct working on section 3.5.1.3 instead of adding the optional field in section 3.5.1.2.</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">In other words, the part of
</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif">3.5.1.3 clause (c)</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"> stating that the code "may be abbreviated to the span of interest by deleting the unneeded subfields"
does already allow removing the Decimal fraction of second subfield?</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">My cent.......</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Gian Paolo</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">PS It looks to me that the sentence "</span><span style="font-size:10.0pt">the need to accommodate the upcoming century rollover in only 11 years</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif">"
was somehow wrong in 2010 as it is now :o)</span> <br>
<br>
<br>
<br>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">From: </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">"Barkley, Erik J (3970)" <<a href="mailto:erik.j.barkley@jpl.nasa.gov">erik.j.barkley@jpl.nasa.gov</a>></span>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">To: </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">"CESG -- CCSDS-Engineering Steering Group (<a href="mailto:cesg@mailman.ccsds.org">cesg@mailman.ccsds.org</a>)
(<a href="mailto:cesg@mailman.ccsds.org">cesg@mailman.ccsds.org</a>)" <<a href="mailto:cesg@mailman.ccsds.org">cesg@mailman.ccsds.org</a>></span>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">Date: </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">22/07/2016 01:44</span>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">Subject: </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">[CESG] CCSDS 301.0-B-4 propsed pink sheet (Time Code B)</span>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">Sent by: </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">"CESG" <<a href="mailto:cesg-bounces@mailman.ccsds.org">cesg-bounces@mailman.ccsds.org</a>></span>
<o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:"Calibri",sans-serif">CESG Colleagues,</span>
<br>
<span style="font-size:10.0pt;font-family:"Calibri",sans-serif"> </span> <br>
<span style="font-size:10.0pt;font-family:"Calibri",sans-serif">Attached is the proposed pink sheet for Time Code B which makes the time code more suitable for such applications as publishing a standardized schedule of services for which mandatory fractional
seconds is meaningless. (By the way does anyone know what the original rationale was for requiring, at a minimum, 1/10 of second time statements?) The proposed change is the addition of “(optional)” which is in keeping with the method by which optional is
designated for the “Z” character in the recommendation. I believe the “.” subfield separator disappears of by application of 3.5.1.3 clause (c). If this change is made to Time Code B, we likely should apply it to Time Code A. </span>
<br>
<span style="font-size:10.0pt;font-family:"Calibri",sans-serif"> </span> <br>
<span style="font-size:10.0pt;font-family:"Calibri",sans-serif">Best regards,</span>
<br>
<span style="font-size:10.0pt;font-family:"Calibri",sans-serif">-Erik</span> <br>
<span style="font-size:10.0pt;font-family:"Calibri",sans-serif"> </span> <br>
<span style="font-size:10.0pt;font-family:"Calibri",sans-serif"> [attachment "301x0b4e1-ProposedPinkSheet.docx" deleted by Gian Paolo Calzolari/esoc/ESA]
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