BS 8521:2009 PDF

BS 8521:2009 Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems BS 8521 specifies requirements for the transfer of information and controls within a social alarm system, by means of dual-tone multi-frequency (DTMF) tone signals passing between site control or local equipment and an alarm receiving centre via the public switched telephone network (PSTN) supporting voice traffic conforming to ITU-T Recommendation G.711. BS 8521 specifies an in-call protocol which supports the 300 ms maximum round trip delay specified in the UK National Transmission Plan for connections over the fixed network. Contents of BS 8521:

Foreword Introduction Scope Normative references Terms and definitions Information transfer Communication Speech path and system control commands Programming Remote access to local unit and controller (incoming calls) Bibliography Diagrammatic representation of an example of an alarm transmission protocol Diagrammatic representation of an example of local unit and speech communication Diagrammatic representation of an example of programming ARC initiated communications sequence with controller ARC initiated communications sequence with local unit and controller