GB/T 2900.99-2016Electrotechnical terminology -- Dependability (English PDF)

2.1 Basic concepts

192-01-01

Product item

Consider the object.

Note 1. The product may be a single component,, device, functional unit, device, sub-system or system.

Note 2. The product may consist of hardware, software, personnel, or any combination thereof.

Note 3. The product is usually composed of elements that can be considered separately. See sub-products (192-01-02) and the agreed level (192-01-05).

Note 4. The term "entity" is defined in GB/T 2900.13-2008 (Appendix A gives the processing of each entry in GB/T 2900.13-2008 of this section) (Entity) "is a synonym for" product ", but it is not applicable to all situations.

Note 5. In GB/T 2900.13-2008 on the definition of the product, not so much a definition, as it is described. The new definition is an important alternative to the whole Text. The previously defined terms are given in Note 1.

192-01-02

Sub-product subitem

Consider a part of the object.

Note. Sub-products can be considered products when considered separately.

192-01-03

System (credibility field) system, independability A collection of interrelated products that together meet specific requirements.

Note 1. The system has a defined real or abstract boundary.

Note 2. System operation may require external resources (from outside the system boundary).

Note 3. The system structure can be hierarchical, such as. systems, subsystems, components and so on.

Note 4. Use and maintenance conditions should be expressed or implied in the request.

Note 5. Rewritten GB/T 2900.83-2008 defines 151-11-27, and its extension is modified to follow the content of the trust.

192-01-04

Sub-system (credibility domain) subsystem, independability A part of the system itself is also a system.

Note. The sub-system usually has a lower level of convention than its system.

192-01-05

Agreed level indenturelevel the hierarchical level in the system hierarchy.

Examples. systems, subsystems, components, and components.

Note. from the maintenance point of view, the level of agreement depends on different factors, including the complexity of product composition, accessibility of sub-products, maintenance personnel skills level, testing Equipment capacity and safety considerations.