1、 IEC 62365 Edition 2.0 2009-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Digital input-output interfacing Transmission of digital audio over asynchronous transfer mode (ATM) networks Audionumrique Interface numrique dentre-sortie Transmission de laudionumrique sur les rseaux mode de
2、transfert asynchrone (ATM) IEC 62365:2009 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photoc
3、opying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your loca
4、l IEC member National Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie et les microfilm
5、s, sans laccord crit de la CEI ou du Comit national de la CEI du pays du demandeur. Si vous avez des questions sur le copyright de la CEI ou si vous dsirez obtenir des droits supplmentaires sur cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit national de la CEI de votre pays
6、de rsidence. IEC Central Office Tel.: +41 22 919 02 11 3, rue de Varemb Fax: +41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards f
7、or all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. Useful links: IEC publications
8、 search - www.iec.ch/searchpub The advanced search enables you to find IEC publications by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, replaced and withdrawn publications. IEC Just Published - webstore.iec.ch/justpublished Stay up to d
9、ate on all new IEC publications. Just Published details all new publications released. Available on-line and also once a month by email. Electropedia - www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in En
10、glish and French, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary (IEV) on-line. Customer Service Centre - webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer S
11、ervice Centre: csciec.ch. A propos de la CEI La Commission Electrotechnique Internationale (CEI) est la premire organisation mondiale qui labore et publie des Normes internationales pour tout ce qui a trait llectricit, llectronique et aux technologies apparentes. A propos des publications CEI Le con
12、tenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amendement peut avoir t publi. Liens utiles: Recherche de publications CEI - www.iec.ch/searchpub La recherche avance vous permet de trouver des publicatio
13、ns CEI en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Elle donne aussi des informations sur les projets et les publications remplaces ou retires. Just Published CEI - webstore.iec.ch/justpublished Restez inform sur les nouvelles publications de la CEI. Just Published dtaill
14、e les nouvelles publications parues. Disponible en ligne et aussi une fois par mois par email. Electropedia - www.electropedia.org Le premier dictionnaire en ligne au monde de termes lectroniques et lectriques. Il contient plus de 30 000 termes et dfinitions en anglais et en franais, ainsi que les t
15、ermes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International (VEI) en ligne. Service Clients - webstore.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 62365 Edit
16、ion 2.0 2009-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Digital input-output interfacing Transmission of digital audio over asynchronous transfer mode (ATM) networks Audionumrique Interface numrique dentre-sortie Transmission de laudionumrique sur les rseaux mode de transfert async
17、hrone (ATM) INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 35.200, 33.160 PRICE CODE CODE PRIX ISBN 978-2-83220-241-8 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warnin
18、g! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 62365 IEC:2009 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 8 2 Normative references . 8 3 Terms and definitions . 8
19、4 Format of audio data in ATM cells 10 4.1 Format of audio samples . 10 4.1.1 Subframes . 10 4.1.2 Audio sample word 10 4.1.3 Ancillary data 10 4.1.4 Protocol overhead . 10 4.2 Packing of sample data into cells 12 4.2.1 Packing schemes 12 4.2.2 Temporal grouping 12 4.2.3 Multi-channel . 12 4.2.4 Gro
20、uping by channel 13 4.3 Formats . 13 4.4 ATM adaptation layer 13 4.5 ATM-user-to-ATM-user indication 13 5 Switched virtual circuits 14 5.1 Addresses . 14 5.2 Audio call connection: SETUP and ADD PARTY messages . 14 5.2.1 Restrictions on connection requests 14 5.2.2 Information elements in the SETUP
21、and ADD PARTY messages . 14 5.2.3 Destination response to SETUP and ADD PARTY messages . 15 5.3 Call disconnection . 16 6 Coding of audio formats . 16 6.1 Qualifying information 16 6.2 Subframe format 17 6.3 Packing of subframes into cells . 17 6.4 Sampling frequency . 18 7 Permanent virtual circuit
22、s . 18 8 Management interface 19 8.1 Call connection: SETUP messages . 19 8.1.1 Restrictions on connection requests 19 8.1.2 Information elements in the SETUP message 19 8.1.3 Destination response to SETUP message 20 8.2 Message encapsulation . 20 8.3 Message format and action to be taken by recipie
23、nt 20 8.4 Message types 21 8.4.1 Messages sent from the controlling entity 21 8.4.2 Messages sent to the controlling entity 23 8.4.3 Vendor-specific messages . 25 Annex A (informative) Data protection 26 Annex B (informative) Application identifier values . 28 62365 IEC:2009 3 Bibliography 29 Table
24、1 Fields contained in a subframe 10 Table 2 Default port number and packing for certain VCIs 19 Table 3 Status enquiry message 21 Table 4 Audio connection request message . 22 Table 5 Audio disconnection request message . 22 Table 6 Input port status message . 23 Table 7 Output port status message .
25、 24 Table 8 Other status messages 25 Table 9 Vendor-specific messages . 25 Table A.1 Sequence number protection field values . 26 Table B.1 Application identifier (octets 9 to 12) values in the BHLI IE 28 4 62365 IEC:2009 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DIGITAL AUDIO DIGITAL INPUT-OUTPUT
26、 INTERFACING TRANSMISSION OF DIGITAL AUDIO OVER ASYNCHRONOUS TRANSFER MODE (ATM) NETWORKS FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC i
27、s to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) an
28、d Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with th
29、e IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly
30、 as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that s
31、ense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees u
32、ndertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedur
33、e to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents
34、including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or
35、reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of t
36、he elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62365 has been prepared by technical area 4: Digital systems interfaces and protocols, of IEC technical committee 100:
37、Audio, video and multimedia systems and equipment. This bilingual version (2012-08) corresponds to the monolingual English version, published in 2009-05.The text of this standard is based on the following documents: FDIS Report on voting 100/1517/FDIS 100/1550/RVD Full information on the voting for
38、the approval of this standard can be found in the report on voting indicated in the above table. The French version of this standard has not been voted upon. 62365 IEC:2009 5 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. This second edition of IEC 62365 cancels
39、 and replaces the first edition published in 2004. The main changes with respect to the previous edition (2004) are listed below. Second, third, and fourth required formats in 4.3 removed. 4.3 reformatted, eliminating Table 2, and subsequent Tables renumbered. The committee has decided that the cont
40、ents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. 6 623
41、65 IEC:2009 INTRODUCTION This International Standard describes means for the transmission of professional audio across digital networks, including metropolitan- and wide-area networks, to provide the best performance with regard to latency, jitter, and other relevant factors. Current-generation wide
42、-area communications are based on two very similar systems, synchronous optical network (SONET) and synchronous digital hierarchy (SDH), SONET being used in the United States and SDH in Europe. On top of them are run integrated services digital network (ISDN), asynchronous transfer mode (ATM), and I
43、nternet protocol (IP). ISDN provides telephone call connections of a fixed capacity that carry one 8-bit value per 125 s; when a call is set up, its route through the system is chosen, and the switches that route the data are configured accordingly. Each link, between switches or between switch and
44、end equipment, is formatted into frames that take 125 s to transmit, and each data byte is identified by its position in the frame. ATM, also called broadband ISDN, provides a service similar to ISDN, but with the capacity of each call being specified by the caller. Links are formatted into cells, w
45、hich consist of a header and 48 data bytes; the header is typically 5 bytes long, and most of it is taken up with the virtual channel identifier (VCI) that shows to which call the cell belongs. Call set-up, routeing, and switching are done in the same way as in ISDN, but with calls not being restric
46、ted to 1 byte every 125 s. IP provides a very different service, not designed for continuous media such as audio and video. There is no call set-up, and each packet contains enough information within itself to allow it to be routed to its destination. This means that the header is much larger than i
47、n the case of ATM, typically 74 bytes, and packets will also typically be much larger, if only because otherwise the overheads would be excessive. Each packet is liable to be routed separately, so two packets that are part of the same flow may well take different routes. This can mean that the one t
48、hat was sent first does not arrive first. For many professional audio applications, a round-trip time from the microphone through the mixing desk and back to the headphones of no more than 3 ms is required. Allowing 0,5 ms each for conversion from analog to digital and back again, it follows that th
49、e network connections to and from the mixing desk must have a latency of less than 1 ms each. For distances of more than about 200 km, the transmission delay alone will exceed 1 ms, but within a metropolitan area the transmission delay should be no more than 0,25 ms (equivalent to about 50 km), leaving 0,75 ms for packetization, queuing within switches, and resynchronization within the receiving equipment
