[Sea-sa] Re: SAWG Re-start and the CCSDS Reference Architecture

Ramon Krosley r.krosley at andropogon.org
Tue Nov 24 21:09:16 UTC 2015

I can attend the Tuesday teleconference for an hour.  On Thursday I 
have only a half-hour.

On November 24, 2015 10:09 MST, "Shames, Peter M (312B)" 
<peter.m.shames at jpl.nasa.gov> wrote:

Roger, Ray, et al,

During this month's CCSDS working meetings we discussed the restart of 
the SEA System Architecture WG, and particularly the immediate task of 
making progress on the CCSDS Reference Architecture.  The request to do 
the SAWG re-start has cleared the CESG conditions and has now been 
submitted for CMC approval.  You can look in the CCSDS CWE for the 
draft charter 
([1]http://cwe.ccsds.org/fm/Lists/Charters/DispForm.aspx?ID=19&Source=http%3A%2F%2Fcwe.ccsds.org%2Ffm%2FLists%2FCharters%2Fsea.aspx&ContentTypeId=0x0100A4D5CA281E0BF448B809E87B9A2111F6) and for the three draft projects that we have agreed are to be started.  The Concept Paper for this work is atached 

As agreed during the CESG meeting, the three projects to be started, in 
priority order, are:

  1. CCSDS Reference Architecture
  2. SANA Registries and policies
  3. RASDS re-confirmation

The following comments reflect what has been proposed and discussed.  
However, I do consider the work plan and the priorities to be open for 
discussion, so if any of you have issues please bring them up now.    
Item 2 on this list is already well under way, having been worked with 
the SANA Operator and the CCSDS Secretariat staff, including the CCSDS 
Chief Tech Writer.  I will load the current drafts into a folder on the 
CWE.  Item 3 on the list should be a quick piece of work, since what we 
have agreed to do is just to re-confirm the current RASDS, CCSDS 
311-M-1, until we have freed the resources to do the more extensive job 
in the second phase of this work.  Item 1 is the one that has some 
sense of urgency from the CMC and that will take significant effort.

Attached are the materials used during the CCSDS Reference Architecture 
special session held on Tuesday, 10 Nov.  These concepts, and the 
figures that represent them, are drawn almost exclusively from existing 
MOIMS SM&C and SOIS documents.  Charts 22-24 describe the open issues 
and overall approach.  I will not repreat all of that here except to 
note that I think the first thing we need to do, after we agree on the 
details of the approach, is to tackle these two issues from pg 22:

   * MOIMS functions, their interactions, and information exchanges 
(internal & external) must be factored into the Reference Architecture
   * SOIS functions, their interactions, and information exchanges 
(internal & external) must be factored into the Reference Architecture

The present materials, at least the ones I could find, just do not have 
the level of clarity and consistency that we need, and they do not 
align with each other nor with the SCCS-ADD, so work must be done to 
sort this out and to get us on a level playing field.  Only after we do 
that can we start to discuss where the gaps are, even on a conceptual 

In order to be able to make any sort of plan for this we need to know 
just what we are each bringing to the table in terms of resources.   I 
will be able to make roughly 25% of my time available to work on this 
for the next six months.  I do have other commitments, so my level of 
effort may vary over time depending on other project priorities.  
Working together I think we can make significant progress in that space 
of time.

I would like to know just what level of effort each of you will be able 
to provide and if you have any scheduling issues.  Please let me know 
what your level of contribution will look like and the expected period 
of performance.

I also propose that we have a planning telecon early in Dec.  Either 
Tuesday 1 Dec or Thursday 3 Dec, at 0800 Pacific work for me.  Do 
either of these days work for you?

Thanks, Peter


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