BS EN 50136-2-4:1998 PDF

Alarm systems - Alarm transmission systems and equipment - Part 2-4: Requirements for equipment used in systems with voice communicators using the public switched telephone network Executive summary Requirements for alarm transmission equipment used in voice communicator systems utilizing the public switched telephone network. Abstract This European Standard specifies additional requirements to those specified in EN 50136-2-1 for equipment used in voice communicator systems utilizing the public switched telephone network. The object of this standard is to specify the performance characteristics of voice communicator equipment used in systems using the public switched telephone network to ensure their suitability for use and compatibility with different types of applications. History and related standards This European Standard includes the following cross-references: EN 50136-1-4 and ETS 300 001.