1、 STD-ITU-T RECMN E.45b-ENGL 1998 4862571 Ob48747 458 U INTERNATIONAL TELECOMMUNICATION UNION ITUmT TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU E.456 (03/98) SERIES E: OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS Quality of service, network management and traf
2、fic engineering - Network management - Checking the quality of the international telephone service Test transaction for facsimile transmission performance ITU-T Recommendation E.456 (Previously CCIlT Recommendation) STDaITU-T RECMN E-45b-ENGL 1998 4862593 Ob48750 L7T IT-T E-SERIES RECOMMENDATIONS OV
3、ERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS OPERATION, NUMBERING, ROUTING AND MOBILE SERVICES INTERNATIONAL OPERATION OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING IN THE INTERNATIONAL TELEPHONE SERVICE TELEPHONY APPLICATIONS ISDN PROVISIONS CONCERNIN
4、G USERS E.330-E.399 QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING NETWORK MANAGEMENT UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON- International service statistics E.400-E.409 Intemational network management E.410-E.419 - Checking the quality of the international telep
5、hone service E.420-E.489 TRAFFIC ENGINEERING QUALITY OF TELECOMMUNICATION SERVICES: CONCEPTS, MODELS, OBJECTIVES AND DEPENDABILITY PLANNING _ For Jilrther details, please refer to ITU-T List ofRecommendations. STD-ITU-T RECMN E-YSb-ENGL L998 - 48b259L Ob48751 006 ITU-T RECOMMENDATION E.456 TEST TRAN
6、SACTION FOR FACSIMILE TRANSMISSION PERFORMANCE Summary This Recommendation specifies a test transaction for use in other E-Series Recommendations that can help benchmark performance of transmission networks with respect to Group 3 facsimile. A test transaction composed of three pages of Recommendati
7、on T.22 Test Chart No. 4 is recommended. Source ITU-T Recommendation E.456 was revised by ITU-T Study Group 2 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 9th of March 1998. Recommendation E.456 (03/98) I - STD-ITU-T RECMN E.45b-ENGL 1998 W 4862593 Ob48752 T42 FOREWO
8、RD IT (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The IT-T is responsible for studying technical, operating and tariff questions and is
9、suing 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
10、 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-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In
11、 this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may
12、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 t
13、his Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB paten
14、t database. O ITU 1998 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation E.456 (03/98) . STD-ITU-T RECMN E.456-ENGL
15、1998 = 4b259L 0648753 989 CONTENTS 1 Introduction 2 References 3 Specification of the test transaction Recommendation E.456 (03198) Page 1 1 1 . 111 Recommendation E.456 TEST TRANSACTION FOR FACSIMILE TRANSMISSION PERFORMANCE (revised in 1998) 1 Introduction The purpose of this Recommendation is to
16、specify a test transaction for use in other E-Series Recommendations that can help benchmark performance of transmission networks with respect to Group 3 facsimile. It will permit comparisons with objective requirements as well as comparisons between measurements made by independent Administrations.
17、 The basis for this Recommendation was an examination of facsimile caller behaviour on a worldwide scale. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publi
18、cation, the edition indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of
19、 the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation E.450 (1993), Facsimile quality of service on PSTN- General aspects. ITU-T Recommendation E.45 1 ( 1993), Facsimile call cut-ojfperformunce. ITU-T Recommendation E.452 (1993), Facsimile modem speed reductions and
20、 transaction fimes. ITU-T Recommendation E.453 (1 994), Facsimile image quality as corrupted by transmission-induced scan line errors. ITU-T Recommendation E.454 (1 996), Transmission performance metrics bused on Error Correction Mode (ECMj facsimile. ITU-T Recommendation E.457 ( 1996), Facsimile me
21、asurement methodologies. ITU-T Recommendation E.458 ( 1996), Figure of merit for facsimile transmission performance. ITW-T Recommendation T.4 (1996), Standardization of Group 3 facsimile apparatus for document transmission. CCITT Recommendation T.6 (1988), Facsimile coding schemes und coding control
22、 functions for Group 4 facsimile apparatus. ITU-T Recommendation T.22 ( 1993), Standardized test charts for document facsimile transmksion. ITU-T Recommendation T.30 (1 996), Procedures for document facsimile transmission in the general switched telephone network. Specification of the test transacti
23、on This clause defines the test transaction in terms of its size in pages, page composition and other important parameters (see Table 1). The test transaction size was selected to retain a manageable size, and present a call of reasonable duration. It is possible to complete a three-page call in app
24、roximately 180 seconds when the specifications in Table 1 are met. The range of average pages per transaction based on measurements on international facsimile calls is between two and three pages. Recommendation E.456 (03/98) 1 STD-ITU-T RECMN E.45b-ENGL 1998 m 48b2591 Ob48755 Test page Transaction
25、size Resolution Minimum scan line length Scan line encoding method Table 1E.456 - Sie, form and parameter settings for the test transaction T.22 No. 4 3 pages Standard (Note) 20 ms for non-ECM, O ms for ECM Modified Huffman (1 -D) 751 m Parameter Value 2 Recommendation E.456 (03/98) STD-ITU-T RECMN
26、E.45b-ENGL 1998 9 4862591 ObY875b 698 9 Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Senes M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Y Series Z ITU-T RECOMMENDATIONS SERIES Organiz
27、ation of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and human factors Non-telephone telecommunication services Transmission systems and
28、media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Transmission of television, sound programme and other multimedia signals Protection against interference Construction, installation and protection of cables and other elements of outside plant
29、TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone installations
30、, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infrastructure Programming languages Printed in Switzerland Geneva, 1998
