1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Series E.300 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 3 (11/1988) SERIES E: OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS Operation of the international service North American precise audible tone plan
2、 ITU-T E.300-series Recommendations Supplement 3 (Formerly CCITT Recommendations) ITU-T E-SERIES RECOMMENDATIONS OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS INTERNATIONAL OPERATION Definitions E.100E.103 General provisions concerning Administrations E.104E.119 G
3、eneral provisions concerning users E.120E.139 Operation of international telephone services E.140E.159 Numbering plan of the international telephone service E.160E.169 International routing plan E.170E.179 Tones in national signalling systems E.180E.189 Numbering plan of the international telephone
4、service E.190E.199 Maritime mobile service and public land mobile service E.200E.229 OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING IN THE INTERNATIONAL TELEPHONE SERVICE Charging in the international telephone service E.230E.249 Measuring and recording call durations for accounting purp
5、oses E.260E.269 UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON-TELEPHONY APPLICATIONS General E.300E.319 Phototelegraphy E.320E.329 ISDN PROVISIONS CONCERNING USERS E.330E.349 INTERNATIONAL ROUTING PLAN E.350E.399 NETWORK MANAGEMENT International service statistics E.400E.409 Internation
6、al network management E.410E.419 Checking the quality of the international telephone service E.420E.489 TRAFFIC ENGINEERING Measurement and recording of traffic E.490E.505 Forecasting of traffic E.506E.509 Determination of the number of circuits in manual operation E.510E.519 Determination of the nu
7、mber of circuits in automatic and semi-automatic operation E.520E.539 Grade of service E.540E.599 Definitions E.600E.649 Traffic engineering for IP-networks E.650E.699 ISDN traffic engineering E.700E.749 Mobile network traffic engineering E.750E.799 QUALITY OF TELECOMMUNICATION SERVICES: CONCEPTS, M
8、ODELS, OBJECTIVES AND DEPENDABILITY PLANNING Terms and definitions related to the quality of telecommunication services E.800E.809 Models for telecommunication services E.810E.844 Objectives for quality of service and related concepts of telecommunication services E.845E.859 Use of quality of servic
9、e objectives for planning of telecommunication networks E.860E.879 Field data collection and evaluation on the performance of equipment, networks and services E.880E.899 For further details, please refer to the list of ITU-T Recommendations. E.300 series Supplement 3 (11/1988) i Supplement 3 to ITU-
10、T E.300-series Recommendations North American precise audible tone plan Source Suplement 3 was approved in Melbourne (1988) and originally published in Blue Book, Fascicle II.2. ii E.300 series Supplement 3 (11/1988) FOREWORD The International Telecommunication Union (ITU) is the United Nations spec
11、ialized 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
12、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 turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid d
13、own in WTSC Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this publication, the expression “Administration“ is used for conciseness to indicate both a telecommunication a
14、dministration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this publication may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applic
15、ability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the publication development process. As of the date of approval of this publication, ITU had not received notice of intellectual property, protected by patents, which may be required to implement th
16、is publication. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2002 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written
17、permission of ITU. E.300 series Supplement 3 (11/1988) 1 Supplement 3 to ITU-T E.300-series Recommendations North American precise audible tone plan Table 1 is a description of the audible tone plan in operation in the North American network to: 1) achieve uniformity in the quality of audible tones;
18、 2) minimize customer and operator confusion as to meaning of audible tones; 3) enable machine recognition of audible tones for purposes of service observing, etc. Basically, the plan provides four frequencies that are used, singly or in combination with particular cadences, to form the audible tone
19、 signals shown in Table 1 as well as some other special purpose, limited use signals. 2E.300 series Supplement 3 (11/1988) TABLE1Frequenciesa)(Hz) Tones350 440 480 620 Powerperfrequencyatexchangeb)where toneisappliedc)CadenceDialtone13dBm0ContinuoustoneDialtone ModernPABXonly16dBm0d)ContinuoustoneRe
20、calldialtone13dBm03 burstsof0.1 sfollowed byacontinuoustonee)Recall dialtone ModernPABXonlyg)16dBm03 burstsof0.1 sfollowed byacontinuoustonee)Busytone24dBm0Burst 0.5 s/silence0.5sBusytone ModernPABXonly21dBm0Burst 0.5 s/silence0.5sReordertone24dBm0Burst 0.25s/silence0.25sReordertoneModernPABXonly21d
21、Bm0Burst 0.25s/silence0.25sAudibleringingtone19dBm0Burst 2 s/silence4 sAudibleringingtone ModernPABXonly16dBm0Burst 1 s/silence3 sCall waitingtone13dBm0Burst of0.3 severy10 sCall waitingtone Modern PABXonlyg)16dBm0Aburstof0.3sStationcall waiting16dBm02 burstsof0.1 se)Outsidecall waiting16dBm03 burst
22、sof0.1 se)Urgent call waitingBusyverification 13dBm0A2.0 sburst followed by0.5 sburstsevery10 sBusyverification ModernPABXonlyg)14dBm0Burst of1.5 to2.0 sfollowedby.f)Executiveoverride ModernPABXonlyg)14dBm0Burst of3.0 sConfirmation tone13dBm0Burst 0.1 s/silence0.1s/Burst 0.3sConfirmation tone Modern
23、PABXonlyg)16dBm03bursts0.1se)a)Frequencylimits are 0.5%ofthenominalfrequency.b)PABXtonelevelsare measuredatthe PABXinterfaces (typicallyatcustomer premises).Power levelsare 2dBlower for privatelineinterfaces. c)Power level tolerancesare+1.5 dB. d)Tolerancelevel for PABXdialtoneis +0.75dB. e)Burstsar
24、eseparated by0.1 s.f)Burst of1.5 to2.0 sbeforeattendant intervenes, followed byrepeatedburstsof0.5 to0.8 s,8 to20 sapart. g)Tones appliedatPABXstationorprivate interfaces andnotatthe exchange interfaces.Geneva, 2002 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series B
25、Means of expression: definitions, symbols, classification Series C General telecommunication statistics 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 Transmissio
26、n systems and media, digital systems and networks Series H Audiovisual and 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 Constructi
27、on, installation and protection of cables and other elements of outside plant Series M TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Series N Maintenance: international sound programme and television transmission circui
28、ts Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks 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 and open system communications Series Y Global information infrastructure and Internet protocol aspects Series Z Languages and general software aspects for telecommunication systems
