DD ENV 50121-4:1996 - Railway applications. Electromagnetic compatibility - Emission and immunity of the signalling and telecommunications apparatus
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"DD ENV 50121-4:1996" refers to a European Normative Document (ENV) related to railway applications, specifically addressing electromagnetic compatibility in the context of emission and immunity of the signaling and telecommunications apparatus. This standard is part of the broader EN 50121 series, which covers various aspects of electromagnetic compatibility for railway applications.
In this specific case:
"DD" typically stands for "Draft for Development," indicating that the standard may have been in a draft stage for development or review.
"ENV" stands for "European Normative Document," signaling its association with the European standards system.
The content of the standard likely includes guidelines and requirements to ensure that signaling and telecommunications apparatus used in railway systems meet specified emission and immunity standards. This is crucial to prevent interference between different systems and maintain the reliability and safety of railway communication and signaling.