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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Erik,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>On the subject of suggested RA
architecture outline, I am still a little unclear of what the objective is for
the concept paper itself. I would have thought that the WG tasked to
develop the Reference Architecture would want to have the flexibility to
identify and define the set of views required to support it. In my
experience, it is only when building a model that it becomes evident which
views are required to capture the key aspects of the modelled system, whilst
keeping the model as simple as possible.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I’ve had a quick look at the UML
models we built for the ESA GDSS study (back in 2005) that was an influence on
the early SM&C work. I am not suggesting the RA should necessarily
follow the approach used there, but it did highlight a couple of key issues to
me.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The GDSS model had 4 main views:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.5in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Functional
View<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.5in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>System
View<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.5in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Service View<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.5in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Information
View<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The Functional view decomposed the system
into [coarse grained] logical functions that could potentially be deployed at distributed
locations (e.g. Position Determination and Orbit Determination). Exposed
interfaces between functions corresponded to identified Services (e.g. Position
Service).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The System view decomposed the system into
deployment entities on which Functions could be deployed (e.g. Spacecraft, MCS,
Ground Station). In the context of your proposed views, this probably corresponds
to the <st1:City w:st="on"><st1:place w:st="on">Enterprise</st1:place></st1:City>
view. Superimposed on this, multiple deployment architectures [scenarios]
could be represented by allocating Function view components to Deployment
entities. These might be regarded as separate [multiple] Deployment Views.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The Service view grouped Services into
packages and identified the dependencies between these (e.g. SM&C MO
Services, TM/TC Packet Services).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The Information view described the
information items that are referenced by Services (e.g. Parameter, Tracking
Data).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>A problem we found was that we needed to
represent interfaces that occurred at different layers of the communications protocol
stack. To do this required different Functional sub-views at each layer,
as the decomposition of the system may appear different at the different layers
(I think we already noted this when discussing the Use Cases at the last telecom).
To cover the whole scope of CCSDS could require multiple layers. For
GDSS, we worked with 3 such layers (Application, Service and Communications) –
as we were really only interested in defining the end-to-end Services, and even
here I think it became complex to represent the potential for multiple
underlying communications protocols to be used by one service.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The Reference Architecture is likely to
need to show:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.5in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Independent
Functional views for each Layer<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.5in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
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</span></font></span></span></font><![endif]><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Multiple
Deployment views corresponding to example Scenarios<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.5in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Multiple
Communication views corresponding to deployment of different Services across
different physical interfaces (from the System view)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>This could rapidly become way too
complicated – we need to be careful not to create unrealistic
expectations on what the RA WG will be able to achieve. The model should
be as simple as it can be to identify all CCSDS services and how they
interrelate. On this basis, I would recommend that the Concept Paper
merely identifies the expected Views together with a brief outline of their
expected content.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hope this is of some help in your musings.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Roger<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color="#0000a0" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#0000A0;font-weight:bold'>Roger
Thompson</span></font></b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color="#0000a0" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#0000A0;font-weight:bold'>SciSys</span></font></b><font
size=3 face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>Systems and Ground Segment Technology Manager, Space
Division</span></font><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:PlaceName w:st="on"><font size=1 face=Arial><span
style='font-size:7.5pt;font-family:Arial'>Methuen</span></font></st1:PlaceName><font
size=1 face=Arial><span style='font-size:7.5pt;font-family:Arial'> <st1:PlaceType
w:st="on">Park</st1:PlaceType>, Chippenham, SN14 <st1:place w:st="on"><st1:City
w:st="on">0</st1:City><st1:State w:st="on">GB</st1:State>, <st1:country-region
w:st="on">UK</st1:country-region></st1:place></span></font><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;font-family:"Times New Roman"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>Tel: +44 1249 466452</span></font><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>Mob: +44 7818 593860</span></font><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt;font-family:
"Times New Roman"'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
css-rasg-bounces@mailman.ccsds.org [mailto:css-rasg-bounces@mailman.ccsds.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Barkley, Erik J (317H)<br>
<b><span style='font-weight:bold'>Sent:</span></b> 02 February 2010 06:28<br>
<b><span style='font-weight:bold'>To:</span></b> CCSDS RA BOF<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Css-rasg] Response to
action 010 -- concept paper outline</span></font><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt;font-family:
"Times New Roman"'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:
11.0pt'>CCSDS Colleagues,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:
11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:
11.0pt'>At the December telecon, I took an action to sketch some ideas for the
BOF concept paper. Attached is a draft sketch of some ideas I think
would be appropriate to include in the draft concept paper. I look forward to
discussing this and subsequent concept paper development plan at the telecon
next week. If anyone has any comments, questions, etc. before the telecon
please do not hesitate to post a reply prior to the telecon. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:
11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:
11.0pt'>Best regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:
11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:
11.0pt'>-Erik<o:p></o:p></span></font></p>
</div>
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