IEC 60839-7-12 Ed. 1.0 b:2001
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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
International Electrotechnical Commission , 03/09/2001
Pages: 13
Specifies the requirements for standard interfaces between the alarm system transceivers and transmission network where both form part of a dedicated channel alarm transmission system as defined in IEC 60839-5-4.
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