IEEE Std 1301-1991 IEEE Standard for a Metric Equipment Practice for Microcomputers—Coordination Document -Description

Abstract: The metric mechanical coordination of microcomputer components, including the cabinet, rack, subracks, printed boards, and common connector-dependent dimensions for connector pitches of 2.5, 2.0, 1.5, 1.0, and 0.5 mm is addressed. This generic standard may be applied in all fields of electronics where equipment and installations are required to conform to a metric modular order. This choice of coordination dimensions for the mechanical structure for heights, widths, and depths lies within a homogeneous, metric, modular, three-dimensional grid as specified in IEC 917. The intent is to provide a single metric equipment practice for worldwide use.

Content

• 1. Introduction
• • 1.1 Scope and Field of Application
  • 1.2 Purpose
  • 1.3 Dimensions
  • 1.4 Coordination Dimensions
  • • 1.4.1 Dimensions of Cabinets and Racks
    • 1.4.2 Dimensions of Subracks and Front Panels
    • 1.4.3 Dimensions of Backplanes
    • 1.4.4 Dimensions of Plug-in Units and Printed Boards
  • 1.5 Connector-Related Parameters
  • 1.6 Environmental Requirements
  • 1.7 Conformance
• 2. References
• 3. Special Word Usage, Definitions, and Abbreviations
• • 3.1 Special Word Usage
  • 3.2 Definitions
  • 3.3 Abbreviations
• 4. Dimensional Nomenclature
• • 4.1 Axis and Boundary References
  • 4.2 Dimensional Location Nomenclature
  • 4.3 Dimensional Nomenclature, Heights
  • 4.4 Dimensional Nomenclature, Widths
  • 4.5 Dimensional Nomenclature, Depths
  • 4.6 Dimensional Nomenclature, Mounting Pitches
• 5. Cabinets and Racks
• 6. Subracks
• 7. Backplanes
• 8. Plug-in Units

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