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
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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
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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
