BS 8521-2009 社会警报系统用双音多频(DTMF)信号协议规范
【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 .The standard specifies an in-call protocol which supports the 300 msmaximum round trip delay specified in the UK National TransmissionPlan 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
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