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IEC 60839-7-12 Ed. 1.0 b:2001
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IEC 60839-7-12 Ed. 1.0 b:2001 Alarm systems - Part 7-12: Message formats and protocols for serial data interfaces in alarm transmission systems - PTT interfaces for dedicated communications channels using ITU-T Recommendation V.23 signalling
standard by International Electrotechnical Commission, 03/09/2001