ITU-T G.108.2-2007 消回声的传送策划情况 G系列:传送系统和媒介 数字系统和网络 国际电话连接和线路 一般定义 Transmission planning aspects of echo cancellers Study Group 12

pdf标准 ITU-T G.108.2-2007 消回声的传送策划情况 G系列:传送系统和媒介 数字系统和网络 国际电话连接和线路 一般定义 Transmission planning aspects of echo cancellers Study Group 12

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ITU-T G.108.2-2007 消回声的传送策划情况 G系列:传送系统和媒介 数字系统和网络 国际电话连接和线路 一般定义 Transmission planning aspects of echo cancellers Study Group 12 第 1 页 ITU-T G.108.2-2007 消回声的传送策划情况 G系列:传送系统和媒介 数字系统和网络 国际电话连接和线路 一般定义 Transmission planning aspects of echo cancellers Study Group 12 第 2 页 ITU-T G.108.2-2007 消回声的传送策划情况 G系列:传送系统和媒介 数字系统和网络 国际电话连接和线路 一般定义 Transmission planning aspects of echo cancellers Study Group 12 第 3 页 ITU-T G.108.2-2007 消回声的传送策划情况 G系列:传送系统和媒介 数字系统和网络 国际电话连接和线路 一般定义 Transmission planning aspects of echo cancellers Study Group 12 第 4 页 ITU-T G.108.2-2007 消回声的传送策划情况 G系列:传送系统和媒介 数字系统和网络 国际电话连接和线路 一般定义 Transmission planning aspects of echo cancellers Study Group 12 第 5 页
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国外分类,ITU,ITU-T(电信标准分局),itu,回声,传送,策划,情况,系列,传送,系统,媒介,数字,系统,网络,国际,电话,连接,线路,一般,定义,transmission,planning,aspects,of,echo,cancellers,study,group

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.108.2 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2007) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS International telephone connections and circuits – General definitions Transmission planning aspects of echo cancellers ITU-T Recommendation G.108.2 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS General definitions 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 QUALITY OF SERVICE AND PERFORMANCE – GENERIC AND USER-RELATED 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 ITU-T Recommendation G.108.2 Transmission planning aspects of echo cancellers Summary ITU-T Recommendation G.108.2 provides guidance for the transmission planning aspects in conjunction with the deployment of echo cancellers in the network. Recognizing that echo cancellers are required on an increasing number of connections due to the increase of end-to-end delay by the introduction of speech processing techniques as well as of packet-based transportation mechanisms, this Recommendation is intended to assist network operators and transmission planners as well as equipment manufacturers and application designers in controlling the effects of echo cancellers on end-to-end speech transmission performance. Source ITU-T Recommendation G.108.2 was approved on 1 March 2007 by ITU-T Study Group 12 (2005-2008) under the ITU-T Recommendation A.8 procedure. ITU-T Rec. G.108.2 (03/2007) i FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-T's purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression "Administration" is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some other obligatory language such as "must" and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY R

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