<p> Report of the Fourth Teleconference of the CCSDS TSG Architecture Working Group</p><p> held on July 18, 2002</p><p>Takahiro Yamada, ISAS, Rapporteur</p><p>1. DATE AND TIME</p><p>The fourth teleconference of the Ad Hoc TSG Working Group on Architecture (hereafter called the Architecture Working Group or AWG) was held from 15:30 to 17:00 on July 18, 2002 (UTC).</p><p>2. PARTICIPANTS</p><p>Takahiro Yamada ISAS [email protected] Peter Shames NASA/JPL [email protected] Adrian Hooke NASA/JPL [email protected] Fred Brosi NASA/GST [email protected] Donald Sawyer NASA/GSFC [email protected] Lou Reich NASA/CSC [email protected]</p><p>3. DISCUSSION SUMMARY</p><p>Brosi reported on the result of the action item 3-1, which was jointly prepared by Brosi and Reich. Their conclusions were that the Reference Model for Open Distributed Processing (RM-ODP) is a flexible model that can be adapted to different needs and that we should use it as guidance against which the CCSDS architecture is to be checked. </p><p>There may be redundancy in the CCSDS models (e.g., in the connectivity, functional and physical models), but these models may be uniformly expressed as locations of entities if the RM-ODP is used.</p><p>Quality of service (reliability etc.) can be elegantly dealt with by the RM-ODP.</p><p>The RM-ODP has been used in some of the work of OMG.</p><p>There was a question on whether an architecture description language is used in the RM- ODP, and the answer was that some languages can be applied (including ADL, ACME, IDL, and OCL=Object Constraint Language).</p><p>However, a concern was raised about using a complicated standard like ODP, in view of the time and resources that we can use between now and the next CCSDS meeting in October. We should rather focus on a simple, high-level description to be presented to project managers.</p><p>The CCSDS architecture should be used as a framework for the reorganization of CCSDS, which is being discussed by the Management Council right now.</p><p>The consensus among the participants was that we should continue working on the current CCSDS model, which will be reviewed from the viewpoint of the RM-ODP at a later time.</p><p>4. ACTION ITEMS</p><p>No. Action Assigned Due date Status to 1-1 Distribute material on what should be All June 7, 2002 Closed contained in each of the seven models. 1-2 Submit comments on the first input and All June 14, 2002 Closed distribute additional material if necessary. 1-3 Contact TC20/SC14 and find out the JPL June 18, 2002 Open status of "ISO/DIS 14711 Unmanned mission operations concepts -- Guidelines" 2-1 Generate a document that describes key Yamada June 19, 2002 Closed concepts of the architecture. 2-2 Provide definitions of key concepts. Shames June 27, 2002 Closed 2-3 Provide information on registry model. Reich June 27, 2002 Open 2-4 Contact ESA for possible participants Yamada June 19, 2002 Closed 3-1 Investigate whether ODP-RM can be Brosi and July 18, 2002 Closed applied to the CCSDS architecture Reich 3-2 Provide FAX number to Reich All July 18, 2002 Closed 4-1 Provide a copy of the mapping exercise Shames July 26, 2002 Open slides to Reich 4-2 Provide information on RM-ODP which Brosi July 26, 2002 Open CCSDS should look at</p><p>5. NEXT TELECONFERENCE</p><p>The fifth AWG teleconference is scheduled for 15:00 Friday, July 26, 2002 (UTC). </p><p>The sixth AWG teleconference is scheduled for 15:00 Thursday, August 8, 2002 (UTC). </p>