NASA Technical Memorandum 103869 Space Station Freedom Data Management System Growth and Evolution Report R. Bartlett, G. Davis, T. L. Grant, J. Gibson, R. Hedges, M. J. Johnson, Y. K. Liu, A. Patterson-Hine, N. Sliwa, H. Sowizral, and J. Yan N93-15k77 (NASA-TM- I03869) SPACE STATION FREEDOM DATA MANAGEMENT SYSTEM GROWTH ANO EVOLU TIr}N REPORT (NASA) Uncl as September 1992 66 P G3/17 0178407 National Aeronautics and Space Administration Z NASA Technical Memorandum 103869 Space Station Freedom Data Management System Growth and Evolution Report T. L. Grant and J. Yan, Ames Research Center, Moffett Field, California September 1992 RIASA National Aeronauticsand Space Administration Ames Research Center MoffettField, CaJifomia94035-1000 The Study Team The Data Management System (DMS) analysis team Digital Equipment Corporation, Moffett Field, CA consists of civil servants and contractors at NASA Ames Roger Bartlett Research Center, Information Sciences Division. Prof. Joanne Bechta Dugan provided the reliability Intelligent Systems Technology Branch, Ames analysis of the DMS network reported in appendix B; she Research Center, Moffett Field, CA used the HARP code and the work was sponsored by Gloria Davis Langley Research Center (LaRC). Members of the Failure Terry Grant Tolerance/Redundancy Management Working Group Bob Hedges provided network failure information and preliminary Y. K. Liu models that aided our study of the failure tolerance of the Dr. Ann Patterson-Hine DMS network. Nancy Sliwa We also acknowledge the following individuals for Sterling Federal Systems, Inc., Palo Alto, CA reviewing early versions of the manuscripts: Dr. Jerry Yah Gregg Swietek (NASA Headquarters), Mike Pasciuto (NASA), Donald Woods (McDonnell Douglas Space Research Institute for Advanced Computational Systems Company (MDSSC)) and George Ganoe Science, Moffett Field, CA (NASA LaRC). Dr. Marjory Johnson Dr. Henry Sowizral RECOM Software, Inc., San Jose, CA Dr. James Gibson Gary Fariss I J PRECED!_G P_nE R._.A?'!K NOT FILMED 111... Table of Contents Page The Study Team .............................................................................................................................................................. m EXECUTIVE SUMMARY 1. Introduction ................................................................................................................................................... xm 2. Purpose and Scope of the Report ................................................................................................................................. xm 3. Background ................................................................................................................................................................. xiii 4. Baseline Evaluation ..................................................................................................................................................... xiii 4.1. System Performance ........................................................................................................................................ xiv 4.1.1 Network performance ............................................................................................................................. xiv 4.1.2 Processor performance ....................................................................................................................... xiv 4.1.3 Software services ............................................................................ :............................................... xv 4.2. System Dependability ....................................................................................................................................... xv 5. Significant Findings ..................................................................................................................................................... xvi 5.1. Processor-Related Findings .............................................................................................................................. xvi 5.2. Network- and System-Related Findings ....................................................................... •.................................. xvi 6. Recommendations ........................................................................................................................................................ xvi 6.1. Further Tests .................................................................................................................................................. xvii 6.2. Short-Term Growth ........................................................................................................................................ xvii 6.3. Long-Term Evolution .................................................................................................................................... xvii 7. Summary .................................................................................................................................................................... xvii SPACE STATION FREEDOM DATA MANAGEMENT SYSTEM GROWTH AND EVOLUTION REPORT 1. Introduction ..................................................................................................................................................................... 1 1.1. The Role of the Data Management System ......................................................................................................... 1 1.2. Purpose of this Report ......................................................................................................................................... 1 1.2.1. Baseline evaluation ................................................................................................................................... 1 1.2.2. Directions and mechanisms for growth and evolution ............................................................................. 2 2. Requirements for DMS Growth and Evolution .............................................................................................................. 2 2.1. Integration of Subsystem Elements and Operations ........................................................................................... 2 2.2. Instrumentation and Sensor Reconfiguration ...................................................................................................... 2 2.3. Subsystem Status Monitoring and Fault Detection ............................................................................................. 2 2.4. Onboard, Automated Element Test and Verification ......................................................................................... 2 2.5. Inventory Management Requirements ................................................................................................................ 3 2.6. Onboard Training Needs .................................................................................................................................... 3 2.7. Payloads and Payload Operations ....................................................................................................................... 3 2.8. EVA/IVA Requirements for Maintenance .......................................................................................................... 3 2.9 Advanced Automation Capabilities ..................................................................................................................... 3 3. Design Overview ............................................................................................................................................................ 3 3.1. Assumptions ........................................................................................................................................................ 3 3.2. The Data Management System Overview ........................................................................................................... 4 3.3. Hardware Component Description ..................................................................................................................... 4 3.3.1. DMS optical network ................................................................................................................................ 5 3.3.2. Network interface unit .............................................................................................................................. 7 3.3.3. Ring concentrator and FDDI network media ............................................................................................ 7 3.3.4. Standard data processor ............................................................................................................................ 8 ........ l_T[NTlO!_,,kllgk_Jf v PRECEDING P_GE BLANK NO'[" FILMED 3.3.5. 1553B local bus .................................................................................................................................... 8 3.3.6. The controller multiplexer-demultiplexer ............................................................................................... 10 3.3.7. Mass storage unit .................................................................................................................................... 10 3.3.8. Multi-purpose application console ......................................................................................................... 11 3.3.9. Gateway .................................................................................................................................................