BS 8521:2009 - Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems – BSI British Standards

BS 8521:2009

Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems

Status : Current, Under review   Published : April 2009

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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



Standard NumberBS 8521:2009
TitleSpecification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems
StatusCurrent, Under review
Publication Date30 April 2009
Confirm Date01 July 2014
Normative References(Required to achieve compliance to this standard)BS EN 50134-3, BS EN 50134-1, ES 201 235-1, ES 201 235-2, ES 201 235-4
Informative References(Provided for Information)ITU-T Recommendation G.711:1988
ReplacesBS 7369:1991
Draft Superseded By08/30129607 DC
DescriptorsMessages, Control functions, Alarm systems, Information transfer, Telephone signalling equipment, Acoustic signals, Warning devices, Digital signals, Data transmission, Special-purpose alarms, Codes, Telephone networks
ICS13.320
CommitteeGW/1/12
ISBN978 0 580 55079 9
PublisherBSI
FormatA4
DeliveryYes
Pages30
File Size153 KB
Price£182.00


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