ITU-T G.107-2015 The E-model: a computational model for use in transmission planning

pdf标准 ITU-T G.107-2015 The E-model: a computational model for use in transmission planning

30 页 0 下载 0 浏览 0 评论 0 收藏 3.0分
温馨提示:当前标准最多只能预览 10 页,若标准超出了 10 页,请下载原标准以浏览全部内容。
ITU-T G.107-2015  The E-model: a computational model for use in  transmission planning  第 1 页 ITU-T G.107-2015  The E-model: a computational model for use in  transmission planning  第 2 页 ITU-T G.107-2015  The E-model: a computational model for use in  transmission planning  第 3 页 ITU-T G.107-2015  The E-model: a computational model for use in  transmission planning  第 4 页 ITU-T G.107-2015  The E-model: a computational model for use in  transmission planning  第 5 页
下载标准到电脑,方便使用
还有 5 页未阅读,继续阅读
本标准由 5zbz2018-09-16 14:46:00上传分享

国外分类,ITU,ITU-T(电信标准分局),itu,the,model,computational,model,for,use,in,transmission,planning

I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n ITU-T U n i o n G.107 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2015) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS International telephone connections and circuits – Transmission planning and the E-model The E-model: a computational model for use in transmission planning Recommendation ITU-T G.107 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS Transmission planning and the E-model General Recommendations on the transmission quality for an entire international telephone connection General characteristics of national systems forming part of international connections General characteristics of the 4-wire chain formed by the international circuits and national extension circuits General characteristics of the 4-wire chain of international circuits; international transit General characteristics of international telephone circuits and national extension circuits Apparatus associated with long-distance telephone circuits Transmission plan aspects of special circuits and connections using the international telephone connection network Protection and restoration of transmission systems Software tools for transmission systems GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIERTRANSMISSION SYSTEMS INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS DIGITAL TERMINAL EQUIPMENTS DIGITAL NETWORKS DIGITAL SECTIONS AND DIGITAL LINE SYSTEM MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE – GENERIC AND USERRELATED ASPECTS TRANSMISSION MEDIA CHARACTERISTICS DATA OVER TRANSPORT – GENERIC ASPECTS PACKET OVER TRANSPORT ASPECTS ACCESS NETWORKS For further details, please refer to the list of ITU-T Recommendations. G.100–G.199 G.100–G.109 G.110–G.119 G.120–G.129 G.130–G.139 G.140–G.149 G.150–G.159 G.160–G.169 G.170–G.179 G.180–G.189 G.190–G.199 G.200–G.299 G.300–G.399 G.400–G.449 G.450–G.499 G.600–G.699 G.700–G.799 G.800–G.899 G.900–G.999 G.1000–G.1999 G.6000–G.6999 G.7000–G.7999 G.8000–G.8999 G.9000–G.9999 Recommendation ITU-T G.107 The E-model: a computational model for use in transmission planning Summary Recommendation ITU-T G.107 gives the algorithm for the so-called E-model as the common ITU-T transmission rating model. This computational model can be useful to transmission planners, to help ensure that users will be satisfied with end-to-end transmission performance. The primary output of the model is a scalar rating of transmission quality. A major feature of this model is the use of transmission impairment factors that reflect the effects of modern signal processing devices. In the 2000 version of this Recommendation, an enhanced version of the E-model was provided in order to better take into account the effects of room noise at the send side and quantizing distortion. With the 2002 version, the impairment due to random packet loss was included in a parametric way for different codecs. Since the 2003 version, an enhanced modelling of quality in the case of low talker sidetone levels is provided. The 2005 version enabled more accurate quality predictions for codecs under (short-term) dependent packet loss. The 2009 version included an Appendix II describing a provisional impairment factor framework for wideband speech transmission. In 2011, this appendix was updated in favour of a new Recommendation ITU-T G.107.1. In the current version, the model has been extended to provide an assessment of delay impairments that is also better tailored to less delay-sensitive use cases. Carrier-grade or enterprise-grade telephony systems must be assessed with the default delay sensitivity parameters, while communication systems with low or very low interactivity requirements can be assessed with different parameters. A reference implementation is given in Appendix III. History Edition Recommendation Approval Study Group Unique ID* 11.1002/1000/4541 11.1002/1000/5074 11.1002/1000/6080 11.1002/1000/6253 11.1002/1000/7822 11.1002/1000/8864 11.1002/1000/9538 11.1002/1000/9730 11.1002/1000/11460 11.1002/1000/11707 11.1002/1000/12120 11.1002/1000/12505 1.0 ITU-T G.107 1998-12-03 12 2.0 ITU-T G.107 2000-05-18 12 3.0 ITU-T G.107 2002-07-14 12 4.0 ITU-T G.107 2003-03-16 12 5.0 ITU-T G.107 2005-03-01 12 ITU-T G.107 (2005) Amd. 1 2006-06-13 12 5.1 6.0 ITU-T G.107 2008-08-29 12 7.0 ITU-T G.107 2009-04-29 12 8.0 ITU-T G.107 2011-12-14 12

给标准打分
您好可以输入 255 个字符
本站的中文名字叫什么( 答案:找标准 )
评论列表
  • 暂时还没有评论,期待您的金玉良言