BS EN 60876-1-2001 pdf download.Fibre optic spatial switches Part 1 : Generic specification.
Interface standards ensure that connectors and adapters that comply with the standard will fit together. The standards may also contain tolerance grades for ferrules and alignment devices. Tolerance grades are used to provide different levels of alignment precision.
The interface dimensions may also be used to design other components that will mate with the connectors. For example, an active device mount can be designed using the adapter interface dimensions. The use of these dimensions, combined with those of a standard plug, provides the designer with the assurance that the standard plugs will fit into the optical device mount. They also provide the location of the optical datum target of the plug.
Standard interface dimensions do not, by themselves, guarantee optical performance. They only guarantee connector mating at a specified fit. Optical performance is currently guaranteed via the manufacturing specification. Products from the same or different manufacturing specifications using the same standard interface will always fit together. Guaranteed performance can be given by any single manufacturer only for products delivered to the same manufacturing specification. However, it can be reasonably expected that some level of performance will be obtained by mating products from different manufacturing specifications, although the level of performance cannot be expected to be any better than that of the lowest specified performance.
2.3.2 Performance standards
Performance standards contain a series of tests and measurements (which may or may not be grouped into a specified schedule depending on the requirements of that standard) with clearly defined conditions, seventies and pass/fail criteria. The tests are Intended to be run on a “once-off” basis to prove any products ability to satisfy the performance standards” requirement. Each performance standard has a different set of tests, and/or seventies (and/or groupings) which represents the requirements of a market sector, user group or system location.
A product that has been shown to meet all the requirements of a performance standard can be declared as complying with a performance standard but should then be controlled by a quality assurance/quality conformance programme.
It is possible to define a key point of the test and measurements standards for their application (particularly with regard to attenuation and return loss) in conjunction with the interface standards of inter-product compatibility. Conformance on each individual product to this standard will be ensured.
2.3.3 Reliability standards
Reliability standards are intended to ensure that a component can meet performance specifications under stated conditions for a stated time period.
Initially, just after component manufacture, there is an “infant mortality phase” during which many components would fail if they were deployed in the field. To avoid early field failure, all components shall be subjected to a screening process in the factory, involving environmental stresses that may be mechanical, thermal, or humidityrelated. This is to induce known failure mechanisms in a controlled environmental situation to occur earlier than would normally be seen in the unscreened population. For those components that survive (and are then sold), there is a reduced failure rate since these mechanisms have been eliminated.
Screening is an optional part of the manufacturing process, rather than a test method. It will not affect the “useful life” of a component, defined as the period during which it performs according to specifications. Eventually, other failure mechanisms appear and the failure rate increases beyond some defined threshold. At this point, the useful life ends, the wear-out stage” begins and the component must be replaced.
At the beginning of useful life, performance testing on a sample population of components may be applied by the supplier, by the manufacturer or by a third party. This is to ensure that the component meets performance specifications over the range of intended environments at this initial time. Reliability testing, on the other hand, is applied to ensure that the component meets performance specifications for at least a specified minimum useful lifetime or specified maximum failure rate. These tests are usually carried out by utilizing performance testing, but with increased duration and severity to accelerate the failure mechanisms.
A reliability theory relates component reliability testing to component parameters and to lifetime or failure rate under testing. The theory then extrapolates these to lifetime or failure rate under less stressful service conditions. The reliability specifications include values of the component parameters needed to ensure the specified minimum lifetime or maximum failure rate in service.
2.3.4 lnterllnking
Standards currently under preparation are given in figure 1. A large number of the test and measurement standards exist already, and the quality assurance qualification approval standards, recognized by the term IECQ, exist already and have done so for many years. As previously mentioned, alternative methods of quality assurance!quallty conformance are being developed under the headings “capability approval” and “technology approval”, covered by IEC QC 001001, IEC QC 001002, and IEC Guide 102.
With regard to interface, performance and reliability standards, once all these three standards are in place, the matrix given in figure 2 demonstrates some of the other options available for product standardization.
Product A is fully IEC standardized, having a standard interface and meeting defined performance standards and reliability standards.BS EN 60876-1-2001 pdf download.
BS EN 60876-1-2001 pdf download
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