【英文标准名称】: Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems 【原文标准名称】: 社会警报系统用双音多频(DTMF)信号协议规范 【标准号】: BS 8521-2009 【标准状态】: 现行 【国别】: 英国 【发布日期】: 2009-04-30 【实施或试行日期】: 2009-04-30【发布单位】: 英国标准学会(GB-BSI)【起草单位】: BSI【标准类型】: ()【标准水平】: ()【中文主题词】: 声信号;警报系统;规程;控制功能;数据传输;数字信号;信息传递;文电;特殊用途警报;电话网;电话信令设备;警告装置【英文主题词】: Acoustic signals;Alarm systems;Codes;Control functions;Data transmission;Digital signals;Information transfer;Messages;Special-purpose alarms;Telephone networks;Telephone signalling equipment;Warning devices【摘要】: This British Standard specifies requirements for the transfer ofinformation and controls within a social alarm system, by means ofdual-tone multi-frequency (DTMF) tone signals passing between sitecontrol or local equipment and an alarm receiving centre via thepublic switched telephone network (PSTN) supporting voice trafficconforming to ITU?T Recommendation G.711 [1].The standard specifies an in-call protocol which supports the 300 msmaximum round trip delay specified in the UK National TransmissionPlan [2] for connections over the fixed network.【中国标准分类号】: A91【国际标准分类号】: 13_320【页数】: 30P.;A4【正文语种】: 英语