FAQ RelCalc MTBF Software. What is Telcordia SR-332? Note: Bellcore (Bell Communications Research, a spin-off of AT&T Bell Labs) was the research arm of the Bell Operating Companies. Bellcore was purchased by SAIC in 1997. The purchase agreement required Bellcore to change its name: Bellcore became Telcordia Technologies in 1999. Ericsson acquired Telcordia in 2012.
Bellcore previously used MIL-HDBK-217 for their reliability predictions, but found that 217 gave pessimistic numbers for its commercial quality products. A few years ago (1985), Bellcore used 217 as a starting point, modified (and simplified) the models to better reflect their field experience, and developed the Bellcore reliability prediction procedure, which is applicable to commercial electronic products.
Telcordia has continued the development of the reliability prediction procedure. Most commercial electronic product companies are now choosing to use the Telcordia SR-332 handbook for their reliability predictions. RelCalc V5.1-TELC3 implements the models of this Telcordia document: 'Reliability Prediction Procedure for Electronic Equipment' Document Number SR-332, Issue 3 You can order this document directly from Telcordia: Telcordia Customer Service Center (Piscataway, New Jersey) Phone: 1-844-251-0201 (USA/Canada) Phone: 1-913-241-6682 (All Others) E-mail: Please note: T-Cubed Systems, Inc. Has no connection or affiliation with Telcordia, and Telcordia does not review, approve, or support the RelCalc software in any way.
Reliability Prediction The reliability prediction module enables you to predict failure rates for a set of components under given conditions. The data may be drawn from a selection of industry standard handbooks such as MIl-HDBK-217, 217 Plus, Telecordia, IEC TR 62380 and NSWC. What’s in the Reliability Prediction Module? The prediction module provides you with a powerful visual interface through which you can select components, define the conditions in which they operate such as the temperature or environmental conditions. The prediction software automatically carries out the failure rate calculation as defined by the standard and provides you with the results. What Industry Standards are Included?
Thus, most of our commercial customers, making products such as computers, telecommunications systems, medical systems, and power supplies, choose to use the Telcordia SR-332 handbook for their reliability predictions.
The Reliability Workbench Prediction module includes the following standards:. Telcordia SR-332 Issues 2 and 3. MIL-HDBK-217. Quanterion 217 Plus. IEC TR 62380 (RDF 2000).
NSWC handbook. GJB/z 299B and 299C.
Siemens SN 29500. FIDES How do I use RWB Prediction?
The components that make up a system can be defined in a tree structure. The tree may be composed entirely of components or it could be subdivided into blocks each of which could hold other blocks or components. The failure rate model for each component is made up of a base failure rate for that particular type of component and multiplying factors known as pi-factors. These factors depend on the operating conditions experienced by the component.
You can input these conditions through simple dialogs and default parameter values are provided. The failure rates of components are calculated immediately and displayed on the tree diagram.
The contributions of components failure rates to blocks and systems failure rates are also displayed. You can examine the effects of stresses caused by the various environmental conditions by displaying the base failure rates and pi-factors for each component. What else can Prediction do? A powerful graphing facility can display the variation of predicted failure rates with ambient temperature, stress and environment settings for an entire system or individual blocks and components.
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You can cut, copy and paste in the diagram to make rapid changes. Commonly used components can be entered once in a library and then pulled into the project tree each time that the component is used. Information can be imported from Excel, Access, SQL Server, Oracle and other formats. Powerful reporting and features allow you to create professional standard reports at the click of a button.