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Once logical entity relationships between the SYSTEM and external systems or between internal items are identi ed, the next step is to analyze and bound the interactions. In 12, System Interfaces, we noted that physical interfaces can be characterized as mechanical, electrical, optical, acoustical, environmental, chemical, biological, and nuclear. The question is: How do we specify and bound the operational and physical characteristics of the interface. Let s answer each part of this question separately.
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Specifying and Bounding Interface Operational Characteristics
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Interface operational characteristics are derived using UML sequence diagrams as illustrated in Figure 17.3. These diagrams, coupled with a Mission Event Timeline (MET), provide analytical insights into HOW the interfacing entities interact and interoperate.
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Specifying and Bounding Interface Physical Characteristics
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Analysis of interacting systems requires investigation of a variety of classes of interactions. For most systems the classes of interfaces include: Electrical Mechanical Optical Chemical Biological Acoustical Human Mass Properties
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43.2 Identifying and Analyzing Interface Interactions
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One of the challenges of physical interface analysis is that SEs and analysts become intrigued and immersed by a speci c class of interaction and tend to overlook or ignore other classes that may become SHOWSTOPPERS. One method of analyzing interfaces employs a matrix approach as illustrated in Figure 43.1. Author s Note 43.1 The matrix provides a framework for illustrating the thought processes required to understand all of the performance effecters that in uence design considerations. Based on these thought processes, your job as a system analyst or SE is to determine which one(s) of the effecters warrants consideration for speci c SYSTEM applications. The matrix maps interactions between a MISSION SYSTEM interface classes (rows) and the OPERATING ENVIRONMENT interface classes (columns). Since both domains of system elements have comparable classes of interfaces, SEs divide each domain into the various categories. Note also that the OPERATING ENVIRONMENT includes the NATURAL, INDUCED and HUMAN-MADE SYSTEMS elements. To facilitate the analysis, we assign a unique identi er to each interaction (row-column intersection). Thus, for each interaction, at least one or more speci cation requirements are written to specify and bound the interaction and the expected outcome and performance of each interaction. To illustrate this point, consider the following example:
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In an environmentally controlled laboratory environment, electrical (class) interactions such as electromagnetic radiation (EMI) and noise are likely to occur and may have an effect on the test articles or instrumentation. In contrast, chemical (class) interactions such as salt spray do not occur naturally in a laboratory.
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MISSION SYSTEM Interface Classes Electrical Mechanical Optical Chemical Biological Acoustical Human Mass Properties
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SYSTEM OF INTEREST (SOI) Interface Attributes
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Figure 43.1 SYSTEM OF INTEREST (SOI) Interface Interactions Analysis Matrix
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N A TU R A IN L En D U v C ED iron El m En ec en tr vi t ic ro al nm M en ec t ha ni ca O pt l ic al C he m ic al Bi ol og ic al A co us tic al H um an M as sP ro pe rt ie s
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OPERATING ENVIRONMENT Interface Classes HUMAN-MADE SYSTEM Interface Attributes
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System Interface Analysis, Design, and Control
Practical Realities
In theory, this approach seems logical; however, is it practical to develop an analysis such as this within contract or task resource and time constraints The answer depends on your situation. In general, most seasoned SEs subconsciously imprint this analytical method into memory based on personal experience. The challenge is assimilating all relevant interactions from memory without overlooking any condition. If your contract or task is resource and time limited, you might consider using a template such as this as a quick checklist to identify the most likely or probable interactions. In sharp contrast, some SYSTEMS may have inherent safety risks with potential consequences for human health and safety, property, the environment, or survival of the enterprise. You and your organization must weight the cost to perform and merits of this analytical task versus the legal, nancial, and other consequences of IGNORING ALL likely interface interactions in practical terms. Guidepost 43.1 Based on the preceding discussion, we have identi ed and characterized the attributes of interface interactions. The question is: WHAT inherent SYSTEM or entity interface capabilities and levels of performance are required to successfully: 1. Be compatible or interoperable with the external SYSTEMS or entities. 2. Avoid threat vulnerabilities related to these interactions This brings us to our next topic, understanding system interface design solutions.