ITU-T G.107.1-2015 SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS International telephone con

pdf标准 ITU-T G.107.1-2015 SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS International telephone con

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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.107.1 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 Wideband E-model Recommendation ITU-T G.107.1 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.107.1 Wideband E-model Summary Recommendation ITU-T G.107.1 gives the algorithm for the wideband (WB) version of the E-model as the common ITU-T transmission rating model for planning speech services that provide WB speech transmission (50-7000 Hz). 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 different types of degradations occurring on the entire transmission path, mouth-to-ear. This WB-E-model is an adapted version of the narrowband (NB) (300-3400 Hz) E-model, typically referred to as "the E-model", which is described in Recommendation ITU-T G.107. It does not replace the NB E-model. Instead, it describes a separate WB version of the model that uses, within limits, similar concepts and input parameters as the NB E-model. History Edition Recommendation Approval Study Group Unique ID* 11.1002/1000/11453 11.1002/1000/12506 1.0 ITU-T G.107.1 2011-12-14 12 2.0 ITU-T G.107.1 2015-06-29 12 ____________________ * To access the Recommendation, type the URL http://handle.itu.int/ in the address field of your web browser, followed by the Recommendation's unique ID. For example, http://handle.itu.int/11.1002/1000/11 830-en. Rec. ITU-T G.107.1 (06/2015) i FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). 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 expres

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