1、 International Telecommunication Union ITU-T P.10/G.100TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2(07/2008) SERIES P: TELEPHONE TRANSMISSION QUALITY, TELEPHONE INSTALLATIONS, LOCAL LINE NETWORKS Vocabulary and effects of transmission parameters on customer opinion of transmission qua
2、lity SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS International telephone connections and circuits General definitions Vocabulary for performance and quality of service Amendment 2: New definitions for inclusion in Recommendation ITU-T P.10/G.100 Recommendation ITU-T P.10/G
3、.100 (2006) Amendment 2 ITU-T P-SERIES RECOMMENDATIONS TELEPHONE TRANSMISSION QUALITY, TELEPHONE INSTALLATIONS, LOCAL LINE NETWORKS Vocabulary and effects of transmission parameters on customer opinion of transmission quality Series P.10 Subscribers lines and sets Series P.30 P.300 Transmission stan
4、dards Series P.40 Objective measuring apparatus Series P.50 P.500 Objective electro-acoustical measurements Series P.60 Measurements related to speech loudness Series P.70 Methods for objective and subjective assessment of quality Series P.80 P.800Audiovisual quality in multimedia services Series P.
5、900 Transmission performance and QoS aspects of IP end-points Series P.1000 Communications between cars Series P.1100 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T P.10/G.100 (2006)/Amd.2 (07/2008) i Recommendation ITU-T P.10/G.100 Vocabulary for performance and
6、quality of service Amendment 2 New definitions for inclusion in Recommendation ITU-T P.10/G.100 Summary Amendment 2 to Recommendation ITU-T P.10/G.100 provides a list of definitions for terms which are used regularly but often ambiguously. The reason for this ambiguity is that these terms are used i
7、n various contexts where they do not belong. Therefore, it was agreed to include these definitions in Recommendation ITU-T P.10/G.100. Source Amendment 2 to Recommendation ITU-T P.10/G.100 (2006) was approved on 14 July 2008 by ITU-T Study Group 12 (2005-2008) under Recommendation ITU-T A.8 procedur
8、e. ii Rec. ITU-T P.10/G.100 (2006)/Amd.2 (07/2008) 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 pe
9、rmanent 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, estab
10、lishes 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-Ts purview, the necessary sta
11、ndards 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 Re
12、commendation 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
13、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 RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed I
14、ntellectual Property Right. 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, ITU had not re
15、ceived notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/
16、ipr/. ITU 2009 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T P.10/G.100 (2006)/Amd.2 (07/2008) 1 Recommendation ITU-T P.10/G.100 Vocabulary for performance and quality of service Amendment 2 New de
17、finitions for inclusion in Recommendation ITU-T P.10/G.100 Introduction The following definitions are to be included in Recommendation ITU-T P.10/G.100 in correct alphabetical order at the respective correct places. This Amendment 2 supersedes Amendment 1. Active testing: Refers to the way that data
18、 is acquired actively for the measurement, i.e., that the test makes use of a dedicated channel for the measurement, e.g., by dialling a number and making a call, i.e., setting-up a channel for the measurement. Double-ended: Refers to a type of measurement, i.e., the point(s) of the network where th
19、e signal(s) to be tested is (are) acquired. A double-ended measurement would require access to two sides of a telephony connection to, e.g., intrusively send a reference signal through a network under test while the resulting test signal will be recorded at another termination point of this network.
20、 Full-reference model: Refers to a type of algorithm; in a full-reference model the algorithm requires a reference signal, which is usually compared to a test signal at the output of a device under test. Intrusive testing: According to the definitions in Recommendation ITU-T X.745, clause 3.10.3, in
21、trusive test means: “A statement made with respect to a test invocation if service/user disruption will or may occur as a result of the test“. This refers to the way that data is acquired for the measurement, i.e., whether or not sending a specific predefined and known reference signal over a channe
22、l for analysis purposes is required. NOTE 1 In contrast to active testing, intrusive testing means that a test signal is sent over the network. NOTE 2 The combinations active and intrusive testing and passive and non-intrusive testing define the most common test situations. Network end-point: A netw
23、ork end-point refers to a terminal at the receiving users side which is connected to the measurement system either electrically or acoustically. Network head-point: A network head-point refers to a terminal at the sending users side which is connected to the measurement system either electrically or
24、 acoustically. Network mid-point: A network mid-point refers to any point in the network that is not the head point or the end-point which is connected to the measurement system either electrically or acoustically. Non-intrusive testing: According to the definitions in Recommendation ITU-T X.745, cl
25、ause 3.10.5, non-intrusive test means: “A statement made with respect to a test invocation if no service/user disruption will or may occur as a result of the test“. This refers to the way that data is acquired for the measurement, i.e., whether or not sending a specific predefined and known referenc
26、e signal over a channel for analysis purposes is required. NOTE 1 In contrast to active testing, intrusive testing means that a test signal is sent over the network. NOTE 2 The combinations active and intrusive testing and passive and non-intrusive testing define the most common test situations. 2 R
27、ec. ITU-T P.10/G.100 (2006)/Amd.2 (07/2008) No-reference model: Refers to a type of algorithm; in a no-reference model the algorithm only requires the test signal to compute a measurement. Offline (out-of-service) measurement: Offline measurements are performed when the network is out of service. On
28、line (in-service) measurement: Online measurement means that the results are obtained during regular use of a network. Online is often understood to mean that measurement results are provided right away while, e.g., a test connection is still active and in use, thus evaluation and data-acquisition a
29、re run side-by-side. Passive testing: Refers to the way that data is acquired passively for the measurement, i.e., that the test makes use of an existing channel for the measurement, e.g., by tapping a further defined point of this channel. Quality of Experience (QoE): The overall acceptability of a
30、n application or service, as perceived subjectively by the end-user. NOTE 1 Quality of experience includes the complete end-to-end system effects (client, terminal, network, services infrastructure, etc.). NOTE 2 Overall acceptability may be influenced by user expectations and context. Reduced-refer
31、ence model: Refers to a type of algorithm; in a reduced-reference model the algorithm only requires the test signal and a set of parameters derived from the reference signal to compute a measurement. Single-ended: Refers to a type of measurement, i.e., the point(s) of the network where the signal(s)
32、 to be tested is (are) acquired. A single-ended measurement would require only access to one side of a network, e.g., at a subscribers termination point. Wave-signal based: Refers to the kind of signal used by the measurement modules/algorithms. In a wave-signal based approach the measurement algori
33、thms employed would analyse the wave-signals, as done for instance in Recommendation ITU-T P.862. Contrary to wave-signal based approaches, packet-information based measurement modules only work on the meta/header information of a packet stream like, e.g., P.564. Both approaches have their benefits
34、and drawbacks and may therefore be employed in different applications according to how suitable they are. Rec. ITU-T P.10/G.100 (2006)/Amd.2 (07/2008) 3 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G
35、.199 General definitions G.100G.109 General Recommendations on the transmission quality for an entire international telephone connection G.110G.119 General characteristics of national systems forming part of international connections G.120G.129 General characteristics of the 4-wire chain formed by t
36、he international circuits and national extension circuits G.130G.139 General characteristics of the 4-wire chain of international circuits; international transit G.140G.149 General characteristics of international telephone circuits and national extension circuits G.150G.159 Apparatus associated wit
37、h long-distance telephone circuits G.160G.169 Transmission plan aspects of special circuits and connections using the international telephone connection network G.170G.179 Protection and restoration of transmission systems G.180G.189 Software tools for transmission systems G.190G.199 GENERAL CHARACT
38、ERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH MET
39、ALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMA
40、NCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999ACCESS NETWORKS G.9000G.9999 Printed in Switzerland Geneva, 2009 SERIES OF ITU-T RECOMMENDATIONS Series A Organ
41、ization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and
42、multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside pla
43、nt Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line network
44、s Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
