DS DS/EN 50136-2-4
DS DSEN 50136-2-4 1998-FEB-11 Alarm systems - Alarm transmsson systems and equpment - Part 2-4 Requrements for equpment used n systems wth voce communcators usng the publc swtched telephone network
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This standard specifies the requirements for equipment used in voice comminicators systems utilising the Public Switched Telephone Network which are in addition to those specified in EN 50136-2-1.
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