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Figure 2 from Alarm transmission for distributed energy resources over power line communication | Semantic Scholar
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PD 6669:2017 Guidance for the provision of Alarm Transmission Systems (ATS) for Alarm Systems in the UK - European Standards
BS EN 50136-1-1:1998 Alarm systems - Alarm transmission systems and equipment. General requirements for alarm transmission systems (+A2:2008) (Withdrawn), British Standards Institution - Publication Index | NBS
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