<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">Hey Keith, I知 levitating because we池e getting into application details, not because you池e talking NTP. I知 sure that when we get terrestrial-like LANs running onboard NTP will be the right way to go. In the meantime us sneaky onboard guys have got neat solutions to do time correlation between onboard clocks that allow us to live with sub-megabit-per-second buses.</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p> </o:p></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">Anyway, many thanks for this excellent work. We値l look through it in the TCOAS session tomorrow and I知 confident that we値l have a specification that we can resolve to vote forward onto the standards track by the end of the week.</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><o:p> </o:p></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">Cheers,</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="mso-spacerun: yes"> </SPAN>Chris.</P><BR><BR><BR>
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<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN class=951551919-12042005> --keith</SPAN></FONT><br><BR>
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<FONT face=Tahoma size=2><B>From:</B> Scott,Keith L. [mailto:kscott@mitre.org] <BR><B>Sent:</B> Tuesday, April 12, 2005 3:20 PM<BR><B>To:</B> 'sois-tcoa@mailman.ccsds.org'<BR><B>Subject:</B> [Time Distribution -- v3]<BR></FONT><BR><br>
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<SPAN class=313410519-12042005><FONT face=Arial size=2>Attached is my cut at v3 of a Time Distribution service spec for TCOAS. I think this version covers Stuart's "alarm at" and "periodic chime" services, as well as the standard 'wallclock' service. The version of 'alarm' I have is an absolute time alarm, not a delay timer version. I figured that an application wanting a delay timer could simply get the current time, add whatever it wanted to it, and submit the result as the argument to the alarm service. A single indication (with four parameters) covers all cases.</FONT></SPAN><br>
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<SPAN class=313410519-12042005><FONT face=Arial size=2>I stayed away from anything that would 'set' the TDS time, figuring that such actions would be more management (which we may want to include in the document, I just don't have 'em yet). I really want to stay away from anyting that gets into an implementation, as I secretly (in the far, far future) want to use the time-synchronizing (NOT the clock-setting parts) of NTP as the time distribution mechanism. Chris levetates out of his chair every time I mention this, so I try to do so often :)</FONT></SPAN><br>
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<SPAN class=313410519-12042005><FONT face=Arial size=2>I'm not particularly clueful about getting the ISO naming convention right, but I also figure that's just a global search-and-replace away, so if somebody has an excellent suggestion for the primitive names, I'm all ears.</FONT></SPAN><br>
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<SPAN class=313410519-12042005><FONT face=Arial size=2>I included the POSIX (<A href="http://www.opengroup.org/austin/papers/posix_faq.html) time.h">http://www.opengroup.org/austin/papers/posix_faq.html) time.h</A> specification at the end of the document; there was some discussion of possibly adopting POSIX. I fear that even a struct tm is a bit heavyweight, but again, would welcome discussion on the topic.</FONT></SPAN><br>
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<SPAN class=313410519-12042005><FONT face=Arial size=2>Comments welcome.</FONT></SPAN><br>
<SPAN class=313410519-12042005><FONT face=Arial size=2></FONT></SPAN> <br>
<SPAN class=313410519-12042005> <FONT face=Arial size=2>--keith</FONT></SPAN><br>
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