From greg.j.kazz at jpl.nasa.gov Thu Apr 12 23:32:45 2007 From: greg.j.kazz at jpl.nasa.gov (Greg Kazz) Date: Thu, 12 Apr 2007 16:32:45 -0700 Subject: [SEA] CCSDS Timecode BoF Message-ID: <6.2.0.14.2.20070412161724.057f3e10@mail.jpl.nasa.gov> All, I am working with the SE area director, Peter Shames in order to form a Birds-of-a-Feather (BoF) group within CCSDS to discuss a proposed update to the Timecode Formats Blue Book. See http://public.ccsds.org/publications/archive/301x0b3.pdf The NASA Constellation Project (CxP) has expressed a need to CCSDS to have it extend the timecode in terms of the number of seconds and extend the resolution of the sub-seconds portion of the timecode. Basically CxP wants to have extend the time code in both directions i.e., for finer resolution beyond the current 3-byte, 40-ns resolution and also be able to extend the seconds field beyond the current approximate 136 year capacity. In order to determine if this proposal has merit that other space agencies could benefit from, I am forming a BoF to examine the feasibility of such a extension to the timecode T and P fields. I have attached a strawman proposal to this email in the form of a pdf Pink sheet for examination along with rationale in the draft BoF word document. Please let me know if you have any comments. best regards, Greg Kazz NASA/JPL -------------- next part -------------- A non-text attachment was scrubbed... Name: 301x0b31[Working].pdf Type: application/pdf Size: 46539 bytes Desc: not available URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: Timecode_Bof2.doc Type: application/msword Size: 64000 bytes Desc: not available URL: From greg.j.kazz at jpl.nasa.gov Thu Apr 26 17:33:29 2007 From: greg.j.kazz at jpl.nasa.gov (Greg Kazz) Date: Thu, 26 Apr 2007 10:33:29 -0700 Subject: [SEA] CCSDS Timecode BoF Message-ID: <6.2.0.14.2.20070426102840.05435d10@mail.jpl.nasa.gov> All, I am resending this email, since I only received one response to it so far. I really would like to get your impression (not a detailed answer or review - I would leave that to the meetings) about the changes that we (Ed and I) have proposed to the Time Code Blue Book. We believe that these changes are in the spirit of the original standard and that they provide greater flexibility for expanding the time code (both in terms of seconds and subseconds) for future missions. Please feel free to pass this email to other colleagues who you think are interested in this topic. thanks, Greg Kazz NASA/JPL All, I am working with the SE area director, Peter Shames in order to form a Birds-of-a-Feather (BoF) group within CCSDS to discuss a proposed update to the Timecode Formats Blue Book. See http://public.ccsds.org/publications/archive/301x0b3.pdf The NASA Constellation Project (CxP) has expressed a need to CCSDS to have it extend the timecode in terms of the number of seconds and extend the resolution of the sub-seconds portion of the timecode. Basically CxP wants to have extend the time code in both directions i.e., for finer resolution beyond the current 3-byte, 40-ns resolution and also be able to extend the seconds field beyond the current approximate 136 year capacity. In order to determine if this proposal has merit that other space agencies could benefit from, I am forming a BoF to examine the feasibility of such a extension to the timecode T and P fields. I have attached a strawman proposal to this email in the form of a pdf Pink sheet for examination along with rationale in the draft BoF word document. Please let me know if you have any comments. best regards, Greg Kazz NASA/JPL -------------- next part -------------- A non-text attachment was scrubbed... Name: 301x0b31[Working].pdf Type: application/pdf Size: 46539 bytes Desc: not available URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: Timecode_Bof2.doc Type: application/msword Size: 64000 bytes Desc: not available URL: