The document outlines the amendments to EN 50136-2:2013, now designated as EN 50136-2:2013+A1:2023, which will remain in effect alongside the previous standard until February 13, 2026. Key changes include clarifications on SPT classification, ATS fault reporting, interface standardization, and event logging requirements, aimed at enhancing accuracy and compatibility among alarm systems. The Technical Bulletin serves as a summary of significant changes and is not an exhaustive list of all differences between the two standards. Manual review may be needed for complete details.