EN 62005-1-2001 pdf download.Reliability of fibre optic interconnecting devices and passive components
Part 1: Introductory guide and definitions.
IEC 62005-4 describes the application of a screening process. It notes that a proper screening process is actually a process, not a test. As a process it shall be maintained and constantly validated to ensure that it achieves the purpose for which it was defined. This process is applied to a product in order to induce products with a known failure mechanism to fail in a controlled situation before the product is deployed In the field.
IEC 62005-6 is intended to provide guidance on the use of field data for assessing the reliability performance of a device.
IEC 62005-7 (under consideration) describes a common set of procedures for calculating the reliability of fibre optic connectors, splices and passive branching devices. The standard deals specifically with component reliability as calculated from life tests which are accelerated in some manner. Without common procedures, the calculation of device reliability is subject to numerous assumptions and approaches. The subsequent stated results may be ambiguous and difficult to interpret and may lead to mistaken conclusions.
4 RelIability approach
A reliability approach, outlined in figure 1, shows a process for defining and improving the reliability aspects of a passive optical component. Each element in the reliability approach plays an important role in the reliability assessment of a passive optical component. In addition, there are several interactions between the elements that lead to improved product and ultimately improved reliability.
Extended qualification is based on real environments and typically involves accelerated testing. Extended qualification is required to assess the possibility of unknown degradation mechanisms. The results often lead to corrective action and may require additional standard test and measurement procedures. They lead to a quantitative reliability assessment but should be verified by field data and be supported by other elements of a complete reliability programme.
Designed experiments are required both to evaluate degradation mechanisms quantitatively and to provide a basis for continuous improvement. The quantitative linkage of accelerated tests to actual field environments over time is often elusive because the mechanics of degradation and the interaction within the spectrum of field environments are not often properly applied. However IEC 62005-2 and IEC 62005-3 will allow proper selection and application of these parameters. This linkage can only be expressed as a degradation model, related in IEC 62005-2 which can usually be assessed only with experiments designed specifically to a given product design or technology. The diversity of designs, technology and materials used in passive components often requires very specific experimentation that may not be universal. There are, however, several fundamental features that are required for valid results. The focus of the IEC 62005 series includes models, experiment requirements, and types of experiments.
The final element in the reliability model is the field data. This data, when combined with the results from the designed experiments leads to a quantitative reliability assessment as shown in IEC 62005-6. Standard requirements include methods of collecting and recording data as well as the analysis of such data.
5 Definitions and terminology, symbols and abbreviations
5.1 DefinitIons and terminology
For the purpose of this part of IEC 62005, certain definitions taken from IEC 60050(191) as well as the following definitions apply.
accelerated test
test in which the applied stress level is chosen to exceed that stated in the reference conditions In order to shorten the time duration required to observe the stress response of the item, or to magnify the responses in a given time duration
NOTE I To be valid, an accelerated test should not alter the basic modes and failure mechanisms or their relative prevalence
NOTE 2 The term stress is used in a generic sense and does not necessarily mean mechanical stress, Other examples are temperature, humidity, chemical activity, and vibrational frequency. The effective stress may be Increased or exiended by varying other parameters in combination such as temperature, time and rate of applicalion.EN 62005-1-2001 pdf download.