ITU-T G.109-1999 语音传输质量的类别定义 Definition of Categories of Speech Transmission Quality - Series G: Transmission Systems and Media,

pdf标准 ITU-T G.109-1999 语音传输质量的类别定义 Definition of Categories of Speech Transmission Quality - Series G: Transmission Systems and Media,

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ITU-T G.109-1999 语音传输质量的类别定义 Definition of Categories of Speech Transmission Quality - Series G: Transmission Systems and Media,  第 1 页 ITU-T G.109-1999 语音传输质量的类别定义 Definition of Categories of Speech Transmission Quality - Series G: Transmission Systems and Media,  第 2 页 ITU-T G.109-1999 语音传输质量的类别定义 Definition of Categories of Speech Transmission Quality - Series G: Transmission Systems and Media,  第 3 页 ITU-T G.109-1999 语音传输质量的类别定义 Definition of Categories of Speech Transmission Quality - Series G: Transmission Systems and Media,  第 4 页 ITU-T G.109-1999 语音传输质量的类别定义 Definition of Categories of Speech Transmission Quality - Series G: Transmission Systems and Media,  第 5 页
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国外分类,ITU,ITU-T(电信标准分局),itu,语音,传输,质量,类别,定义,definition,of,categories,of,speech,transmission,quality,series,transmission,systems,and,media

INTERNATIONAL TELECOMMUNICATION UNION G.109 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (09/99) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS International telephone connections and circuits – General definitions Definition of categories of speech transmission quality ITU-T Recommendation G.109 (Previously CCITT Recommendation) ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100–G.199 General definitions G.100–G.109 General Recommendations on the transmission quality for an entire international telephone connection G.110–G.119 General characteristics of national systems forming part of international connections G.120–G.129 General characteristics of the 4-wire chain formed by the international circuits and national extension circuits G.130–G.139 General characteristics of the 4-wire chain of international circuits; international transit G.140–G.149 General characteristics of international telephone circuits and national extension circuits G.150–G.159 Apparatus associated with long-distance telephone circuits G.160–G.169 Transmission plan aspects of special circuits and connections using the international telephone connection network G.170–G.179 Protection and restoration of transmission systems G.180–G.189 Software tools for transmission systems G.190–G.199 INTERNATIONAL ANALOGUE CARRIER SYSTEM GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIERTRANSMISSION SYSTEMS G.200–G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300–G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400–G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450–G.499 TESTING EQUIPMENTS TRANSMISSION MEDIA CHARACTERISTICS G.600–G.699 DIGITAL TRANSMISSION SYSTEMS TERMINAL EQUIPMENTS G.700–G.799 DIGITAL NETWORKS G.800–G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900–G.999 For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION G.109 DEFINITION OF CATEGORIES OF SPEECH TRANSMISSION QUALITY Summary This Recommendation defines five categories of end-to-end speech transmission quality for 3.1 kHz handset telephony. These categories are defined as ranges of speech transmission quality in terms of "user satisfaction", tied to the ratings given by the transmission planning tool of Recommendation G.107 which takes into account the combined effects of various transmission impairments. The definitions provided here are independent of any specific technology that may be used in different types of network scenarios under consideration. Source ITU-T Recommendation G.109 was prepared by ITU-T Study Group 12 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on 30 September 1999. Keywords E-Model, speech transmission quality, user satisfaction, voice quality. Recommendation G.109 (09/99) i FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The 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 Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 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 term recognized operating agency (ROA) includes any individual, company, corporation or governmental organization that operates a public correspondence service. The terms Administration, ROA and public correspondence are defined in the Constitution of the ITU (Geneva, 1992). INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property

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