TIA-968-A & TIA-968-B有什么区别呢？
TIA-968-BTIA-968-A电信-电话终端设备-终端设备连接到电话网络的技术要求在2011年3月22日之前有效，直至TIA-968-B取代。在2011年3月22日之前，用户可以引用TIA-968-A及其附录或TIA-968-B。
TIA-968-A取代了FCC第68部分，但助听器兼容性（HAC），音量控制和室内布线除外。现在，TIA-968-B依次替代了TIA-968-A及其A1，A2，A3和A4附录。此新版本与加拿大CS03要求紧密协调。 TIA TR41和加拿大工业部之间的持续努力将继续这些协调努力。世界各国也都认可该美国标准，并将其全部或部分用于其电话终端设备计划。
GR 1089是美国地区钟声运营公司（RBOC）普遍支持的标准。它由Telcordia Technology（以前称为Bellcore）更新。 RBOC通常要求他们购买任何电信产品都遵守GR 1089。 GR-1089第6期是最新更新，预计将于2011年3月发布。
TIA-968-A Telecommunications - Telephone Terminal Equipment - Technical Requirements for Connection of Terminal Equipment to the Telephone Network, is valid for approvals until March 22, 2011 when it will be superseded by TIA-968-B. Until March 22, 2011, users may cite either TIA-968-A, along with its addenda, or TIA-968-B.
TIA-968-A replaced FCC Part 68 with the exception of hearing aid compatibility (HAC), volume control, and indoor cabling. TIA-968-B now in turn replaces TIA-968-A and its A1,A2, A3, and A4 addenda. This new version is closely harmonized with the Canadian CS03 requirements. Continued efforts between TIA TR41 and Industry Canada will continue these harmonization efforts. Various countries around the world also recognize this USA standard and use it either wholly or in part for their telephone terminal equipment programs.
GR 1089 is a standard generally supported by the USRegional Bell Operating Companies (RBOCs). It is updatedby Telcordia Technology (formerly Bellcore). The RBOCstypically require compliance with GR 1089 for any of theirtelecom purchases. GR-1089 Issue 6 is the most recentupdate as is expected to be published March 2011.
The ITU is a specialized agency of the UN devoted tointernational harmonization. Most European countriesrecognize the ITU standards.
CNET is the Centre National d’etudes deTelecommunications, a French organization.
VDE is the Verband Deutsher Elektrotechniker, a Federationof German electrical engineers. VDE is very similar to theIEEE (Institute of Electrical and Electronics Engineers) but isnational in scope rather than global.
ANSI is the American National Standards Institute, which isa non-government organization. The British equivalent to thisis BSI.
IEC is the International Electrotechnical Commission, aresult of Europe’s move toward a single market structureand its drive to formalize and harmonize member countries’requirements.
FTZ R12 is a German specification.
Surge Waveforms for Various Standards
TIA-968-A Standard download
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Longitudinal voltage - 4 kHz to 270 kHz
4.5.5.2 Longitudinal voltage4.5.5.2.1 4 kHz to 270 kHz.
Center frequency (f) of 8-kHz band Max voltage in all 8-kHz bandsLongitudinal terminating impedance
8 kHz to 12 kHz -(18.4 + 20 log f) dBV 500 Ω
12 kHz to 42 kHz (3 – 40 log f) dBV 90 Ω
42 kHz to 266 kHz -62 dBV 90 Ω
4.5.5.2.2 270 kHz to 6 MHz. The rms value of the longitudinal voltage components, in the frequency range of 270 kHz to 6 MHz shall not exceed -30 dBV with a longitudinal termination having an impedance of 90 Ω.
Longitudinal voltage 4 kHz to 270 kHz test data as below
感謝大大的分享喔 thanks, I need the doc. web 发表于 2019-11-25 18:51
4.5.5.2 Longitudinal voltage
4.5.5.2.1 4 kHz to 270 kHz.
你好，这个纵向电压是测试的FXO口吗 感謝分享
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