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Alarm systems. Alarm transmission systems and equipment - General requirements for alarm transmission equipment Ingestion-build-54484 This part of BS ENAlarm systems Alarm transmission systems and equipment Part 2 1: General requirements for alarm transmission equipment Executive summary General requirements for alarm transmission equipment used in alarm transmission systems. Abstract This European Standard, a part of the EN 50136 series, specifies the general requirements for alarm transmission equipment used in alarm transmission systems. This standard does not specify the equipment used to display