GR 2840 CORE : ISSUE 1

Preface
1 Introduction
    1.1 Scope
    1.2 Requirements Terminology
    1.3 Requirement Labeling Conventions
          1.3.1 Numbering of Requirement and Related Objects
          1.3.2 Requirement, Conditional Requirement and
                  Objective Object Identification
2 Environmental Stressing
    2.1 When to Perform Environmental Stressing
    2.2 Cost Effectiveness of Environmental Stressing
          2.2.1 Capital Costs added by Environmental
                  Stressing
          2.2.2 Annual Operating Costs generated by
                  Environmental Stressing
          2.2.3 Annual Operating Costs without Environmental
                  Stressing
          2.2.4 Savings in Annual Operating Costs
          2.2.5 Return on Investment per Year
          2.2.6 Payback Period in Years
    2.3 Determination of the Environmental Stressing
          Protocol
          2.3.1 Environmental Stressing Parameters
          2.3.2 Operating and Technology Limits
          2.3.3 Stress Measurements
          2.3.4 Failure during Step Stress
          2.3.5 Developing the Environmental Stressing
                  Protocol
          2.3.6 Environmental Stressing Protocol Proofing
    2.4 Application of the Environmental Stressing
          protocol
          2.4.1 Stress Measurement
          2.4.2 Environmental Stressing of a Product
          2.4.3 Environmental Stressing Protocol Feedback
    2.5 Reporting on Environmental Stressing
3 Conclusion
Appendix A: Requirement-Object List
Appendix B: Examples of Cost/Benefit Analyses for
            Environmental Stressing
    B.1 Case study I
    B.1.1 Capital Costs for Environmental Stressing
    B.1.2 Annual Operating Costs with Environmental
            Stressing
    B.1.3 Annual Operating Costs Using Traditional
            Burn-In
    B.1.4 Savings in Annual Operating Costs
    B.1.5 Return on Investment per Year
    B.1.6 Payback Period in Years
    B.2 Case Study II
    B.2.1 Capital Costs for Environmental Stressing
    B.2.2 Annual Operating Costs with Environmental
            Stressing
    B.2.3 Annual Operating Costs Using Traditional
            Burn-In
    B.2.4 Savings in Annual Operating Costs
    B.2.5 Return on Investment per Year
    B.2.6 Payback Period in Years
Appendix C: Examples of Stress Stimuli
    C.1 Temperature Cycling Stressing
    C.2 Random Vibration Testing
    C.3 Power Cycling Stressing
    C.4 Voltage Cycling Stressing
Appendix D: Typical Defects Revealed Using Temperature
            Cycling and Vibration
Appendix E: Examples of Environmental Stressing Protocols
References
Glossary
Requirement-Object Index

Sets out Bellcore's view of proposed generic requirements for Environmental Stressing Applied to Telecommunications Products. Environmental stressing involves the application of multiple stress stimuli beyond product specification limits to reveal latent defects in assemblies , subsystems and systems. Latent defects present in incoming parts and those created in manufacturing are turned into failure inducing patent defects. Their root cause is analyzed and the problem corrected before the product reaches the customer, thereby reducing early life failures.