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Appendix C: Commanding Architecture

C-1. Introduction

This appendix presents the software and hardware architectures for the satellite Commanding application. The contents of this appendix are as follows:

* assumptions upon which the Commanding architecture was developed

* a set of DFDs indicating the functional breakdown of Commanding, data flows into and out of Commanding, and data flows between functions within Commanding

* a CFD indicating temporal dependencies of Commanding functions

* requirements analysis and benchmarking to determine computational loads

* Commanding Contact hardware architecture

* Commanding Contact software architecture

This architecture assumes a fairly comprehensive satellite commanding capability. The focus of this appendix is to present the detailed Commanding architecture design, and key functionality driving the design. A conservative analysis of bandwidth and processor requirements is outlined. Data flows provide a logical breakdown of functionality, which was applied in developing of the architecture options for Commanding , as well as other functional areas.