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Criteria for Design and Specification

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Criteria for Design and Specification

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    1. Criteria for Design and Specification NeSSI Issues Presentation to IFPAC Regarding NeSSI Generation 2 Bus January, 29, 2008 Bob Farmer

    2. Topics Overview; terminology Design criteria System issues Bus and cabling Components Product and marketing issues

    3. Basic Bus Configuration and System Concept

    4. Extended System Concept

    5. Extended System Concept

    6. Component Electrical Implementation

    7. Design Criteria System Bus and Cable Components

    8. System Design Criteria Overall system configuration and size Minimum Typical Maximum Ambient environment Impact on bus external to system enclosure System environment Impact on bus internal to system enclosure Impact on components and devices in system Component capabilities and requirements Power issues Native capabilities and implementation methods regarding safety concerns Market volume: available development resource commitment and impact on bus interface development

    9. Bus Design Criteria Capacity Number of devices Types of devices Participating suppliers Physical Issues / Installation IP ratings / protection Ambient conditions Certifications / safety Chemical resistance Electrical Length Installed base / compatibility Load capacity / load management Power distribution Interruption / interchange Reliability / EMI / RFI Instances / continuity Software Device representation Device function Maintenance issues Configuration / addressing / identity

    10. Cabling Issues Cable size, bend radius, height Connection methods and system design Jacket materials Cost

    11. Component Design Criteria Primary component performance Physical size and shape Mounting constraints Power consumption Diagnostic support Ambient and physical ratings (see also Bus and Cabling) Chemical and atmospheric tolerance (see also Bus and Cabling)

    12. Other Product Marketability Issues System responsibility Supplier: Integrator, component manufacturer, bus provider System elements: Bus master, components, cables and peripherals Field support Training Configuration and implementation difficulties Issues with interchangeability Spare parts and long term support Field diagnosis and repair plan Component support life: longevity in a “capital” investment versus short life span of electronic and software techniques

    13. Questions - Discussion

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