Explore three essential telecommunications standards that shape today's connectivity and smart utility management: prEN IEC 60794-1-117:2025 for testing bending stiffness in optical fibre cables, SIST EN 13757-3:2025 covering application protocols for meter communications, and SIST. In case of any existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI deliverable is the one made publicly available in PDF format at Users of the present document should be aware that the document may be subject. Optical fiber communications are essential for all types of long- and short-distance transmissions. The aim of this paper is to analyze the previously presented security risks and, based on measurements, provide the risk level evaluation. TEMPEST relates to the requirements for shielding communications equipment and environments to prevent data related electromagnetic interference (EMI) or radio frequency interference (RFI) from propagating beyond specific boundaries. Since the physical layer forms the bottom layer in the open systems inter-connection (OSI) model , the performance and security of the physical layer and especially.
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