IEEE Std 2839:2021 pdf download.IEEE Recommended Practice for Vital Computer for Rail Safety-Related Application.
This recommended practice defines the functions, performance. interface, and environmental conditions of vital computers used in rail transportation systems such as railways, metros, light transport, and trams. This recommended practice is applicable to vital computers for onboard and wayside equipment.
This recommended practice is not applicable to the application systems which are developed based on vital computers and does not define specific safety targets for application systems, but the safety-related conditions for application systems are proposed.
It is difficult to regulate internal structure and technical realization of vital computers, because of the great diversity that exists. In order to encourage technical competition and prompt the development of technology and industry, this recommended practice does not constrain or recommend the internal structure and technical realization of vital computers.
Only the preliminary interface is defined in this recommended practice, on a function level. The detailed interface of a vital computer is not covered and can be defined in the form of external interface specifications.
Compliance with the provisions of this recommended practice does not guarantee or ensure safety. security, health, or environmental protection. Users are responsible for observing all applicable legal and regulatory requirements.
1.2 Purpose
The purpose of this recommended practice is to establish general requirements for vital computers, promote unified functions, performance, and interfaces to increase interchangeability of vital computers and compatibility between vital computers and systems, simplify system design and reduce the overall cost of manufacturing, operating, and maintaining systems.
1.3 Word usage
The word shall indicates mandatory requirements strictly to be followed in order to conform to the standard and from which no deviation is permitted (shall equals is required o). “-‘
The word should indicates that among several possibilities one is recommended as particularly suitable. without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required (should equals is recommended that).
The word may is used to indicate a course of action permissible within the limits of the standard (may equals is permitted to).
The word can is used for statements of possibility and capability, whether material, physical, or causal (can equals is able to).
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
IEC 60297-3-101, Mechanical structures for electronic equipment—Dimensions of mechanical structures of the 482.6 mm (19 in) series—Part 3—101: Sub-racks and associated plug-in units.
IEC 61373, Railway applications— Rolling stock equipment Shock and vibration tests.
IEC 61375 (all parts), Electronic railway equipment—Train communication network (TCN).
IEC 62236-4, Railway applications Electromagnetic compatibility— Part 4: Emission and immunity of the signaling and telecommunications apparatus.
IEC 62278 (all parts), Railway applications—The specification and demonstration of Reliability, Availability. Maintainability and Safety (RAMS).
IEC 62279, Railway applications—Cornmunication, signalling and processing systems—Software for railway control and protection systems.
IEC 62280. Railway applications— —Communication, signalling and processing systems— -Safety-related communication in transmission systems.
IEC 62425, Railway applications—Communication, signalling and processing systems—Safety related electronic systems for signalling.IEEE Std 2839 pdf download.