![]() ![]() ![]() We will present an overview of the four versions of the standard that are supported by the software, and then give an example that uses the latest version of the standard, Telcordia SSR-332 Issue 3. During the past fifteen years, four versions of the standard have been published: Bellcore/Telcordia Standards The Telcordia reliability prediction procedure has a long and distinguished history of use in the telecommunications and electronics industry.Telcordia SR-332 Issue 3 (2011) Each new version modifies the previous edition based on new data.Telcordia Issue 1 made minor changes and updated the device failure rates published in Bellcore TR-332. ![]() In Telcordia Issue 2, several new devices were introduced and the generic device failure rates were updated. In addition, the standard deviation of the generic failure rate for each device was provided so calculations for the upper confidence bound of the failure rate were made possible.Reliability Predictions are commonly used in the development of products and systems to compare alternative design approaches and to assess progress toward reliability design goals. Nevertheless, predictions are a valuable form of analysis that also provide insight into safety, maintenance and warranty costs and other product considerations.Commonly used electronic reliability prediction approaches include: They’re often criticized as not being accurate forecasts of field reliability performance because they don’t usually account for all the factors that cause field failures.MIL-HDBK-217 “Reliability Prediction of Electronic Equipment” – Even though this handbook is no longer being kept up to date by the US military, it remains the most widely used approach by both commercial and military analysts.Bellcore (now Telcordia) TR-332 – The Bellcore approach is widely used in the telecommunications industry and has been recently updated to SR-332 in May 2001.RDF 2000– This is the latest and most comprehensive of the European methodologies developed by CNET.It hasn’t yet received much attention in the US but it could evolve into the new international standard should MIL-HDBK-217 continue to become outdated. Like the PRISM approach, it also addresses thermal cycling and dormant system modeling. PRISM – PRISM is a new technique developed by the Reliability Analysis Center which has the ability to model the effects of thermal cycling and dormancy.At this time it’s rather limited from a device coverage standpoint but it shows potential for community acceptance as it matures. Quanterion’s David Mahar developed the software currently being marketed. Physics-of-Failure – This family of approaches differs significantly from the other empirical methodologies listed above and is used primarily at the sub-device level during the design stage. ![]()
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