SIST EN 62379-1:2008

Common control interface for networked digital audio and video products -- Part 1: General

This part of IEC 62379 specifies a control interface for products which convey audio and/or video across digital networks. Separate documents specify items specific to a particular type of traffic, a particular networking technology, or a particular class of application.

Gemeinsame Steuerschnittstelle für netzwerkbetriebene digitale Audio- und Videogeräte -- Teil 1: Allgemeines

Interface de commande commun destiné aux produits audio et video numériques connectés en réseau -- Partie 1: Généralités

La CEI 62379:2007 spécifie une interface de commande pour des produits transmettant des signaux audio et/ou vidéo sur des réseaux numériques. La présente version bilingue (2012-08) correspond à la version anglaise monolingue publiée en 2007-08.

Skupni krmilni vmesnik za digitalne avdio in video izdelke, vključene v omrežje - 1. del: Splošno (IEC 62379-1:2007)

General Information

• Status: Published
• Publication Date: 27-Nov-2007
• ICS: 33.160.01 - Audio, video and audiovisual systems in general
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 26-Nov-2007
• Due Date: 31-Jan-2008
• Completion Date: 28-Nov-2007
• Ref Project: EN 62379-1:2007 - Common control interface for networked digital audio and video products - Part 1: General

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62379-1:2008
01-februar-2008
6NXSQLNUPLOQLYPHVQLN]DGLJLWDOQHDYGLRLQYLGHRL]GHONHYNOMXþHQHYRPUHåMH
GHO6SORãQR,(&
Common control interface for networked digital audio and video products -- Part 1:
General
Gemeinsame Steuerschnittstelle für netzwerkbetriebene digitale Audio- und Videogeräte
-- Teil 1: Allgemeines
Interface de commande commun destiné aux produits audio et video numériques
connectés en réseau -- Partie 1: Généralités
Ta slovenski standard je istoveten z: EN 62379-1:2007
ICS:
33.160.01 Avdio, video in avdiovizualni Audio, video and audiovisual
sistemi na splošno systems in general
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
SIST EN 62379-1:2008 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 62379-1:2008

---------------------- Page: 2 ----------------------

SIST EN 62379-1:2008


EUROPEAN STANDARD
EN 62379-1

NORME EUROPÉENNE
November 2007
EUROPÄISCHE NORM

ICS 33.160; 35.100


English version


Common control interface
for networked digital audio and video products -
Part 1: General
(IEC 62379-1:2007)


Interface de commande commun destiné Gemeinsame Steuerschnittstelle
aux produits audio et video numériques für netzwerkbetriebene digitale
connectés en réseau - Audio- und Videogeräte -
Partie 1: Généralités Teil 1: Allgemeines
(CEI 62379-1:2007) (IEC 62379-1:2007)




This European Standard was approved by CENELEC on 2007-10-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in two official versions (English and German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62379-1:2007 E

---------------------- Page: 3 ----------------------

SIST EN 62379-1:2008
EN 62379-1:2007 - 2 -
Foreword
The text of document 100/1248/FDIS, future edition 1 of IEC 62379-1, prepared by IEC TC 100, Audio,
video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 62379-1 on 2007-10-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-10-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62379-1:2007 was approved by CENELEC as a European
Standard without any modification.
__________

---------------------- Page: 4 ----------------------

SIST EN 62379-1:2008
- 3 - EN 62379-1:2007
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

ISO/IEC 646 1991 Information technology - ISO 7-bit coded - -
character set for information interchange


ISO/IEC 8824-1 2002 Information technology - Abstract Syntax - -
Notation One (ASN.1): Specification of basic
notation


IEEE Std 802 2001 IEEE Standard for Local and Metropolitan - -
Area Networks: Overview and Architecture


1)
RFC 1157 - Simple Network Management Protocol - -
(SNMP) (IETF Standard #15)


1)
RFC 1441 - Introduction to version 2 of the Internet-- -
standard Network Management Framework
(IETF)


1)
RFC 3411-3418 - Simple Network Management Protocol - -
version 3 (IETF Standard #62)




1)
Undated reference.

---------------------- Page: 5 ----------------------

SIST EN 62379-1:2008

---------------------- Page: 6 ----------------------

SIST EN 62379-1:2008
IEC 62379-1
Edition 1.0 2007-08
INTERNATIONAL
STANDARD

Common control interface for networked digital audio and video products –
Part 1: General


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XB
ICS 33.160; 35.100 ISBN 2-8318-9279-1

---------------------- Page: 7 ----------------------

SIST EN 62379-1:2008
– 2 – 62379-1 © IEC:2007(E)
CONTENTS
FOREWORD.4

0 Introduction .6
0.1 Overview .6
0.2 Structure of the family of standards .6
0.3 Model of the equipment being controlled .7
0.3.1 Blocks .7
0.3.2 Control framework .8
0.3.3 How the framework helps when designing units .9
0.3.4 How the framework enables "plug and play" .9
0.3.5 Defining a new type of block.9
0.4 Management information base (MIB) .10
0.4.1 Objects.10
0.4.2 Other uses of OIDs.10
0.4.3 Migration to XML .10
0.5 Status broadcasts .11
0.5.1 Introduction .11
0.5.2 Status page information sources.11
0.5.3 Status page general format.11
0.6 Calls.11
0.7 Privilege levels .12
0.8 Automation.13
0.9 Uploading software.13
0.10 Encapsulation of messages .14
0.11 Further information.14
1 Scope.15
2 Normative references .15
3 Terms and definitions .15
4 Unit management .18
4.1 Protocol.18
4.2 MIB definitions .19
4.2.1 General .19
4.2.2 Application-wide type definitions.20
4.2.3 Conceptual row type definitions .24
4.2.4 MIB objects for basic unit identity and status information.25
4.2.5 MIB objects for the block framework .28
4.2.6 MIB objects for real time clock information.30
4.2.7 MIB objects for reference clock information .31
4.2.8 MIB objects for software upload.32
4.2.9 MIB objects for scheduled operations .34
5 Procedures.36
5.1 Real-time clocks.36
5.2 Procedures for uploading software .36
5.2.1 Areas.36
5.2.2 Contents.37
5.2.3 Procedure for updating a software component .37

---------------------- Page: 8 ----------------------

SIST EN 62379-1:2008
62379-1 © IEC:2007(E) – 3 –
5.2.4 File format for a software component.38
5.2.5 Format for product files .39
5.2.6 Software distribution.40
5.3 Scheduled operations.40
5.3.1 Requesting a scheduled operation.40
5.3.2 Executing a scheduled operation .42
5.3.3 Delaying a scheduled operation.42
5.3.4 Aborting a scheduled operation .42
5.3.5 State of relative operations.42
6 Status broadcasts.42
6.1 General .42
6.2 Page formats.44
6.2.1 Basic unit identity page .44
6.2.2 Time-of-day page .44
6.2.3 Scheduled operations page .45
6.3 Page groups.45
6.3.1 basicUnitStatus.45
6.3.2 timeOfDay .45
6.3.3 scheduledOps .45

Annex A (informative) Background information.47
Annex B (informative) Machine-readable MIB definitions.50
Annex C (informative) Machine-readable status page-group definitions .68

Bibliography.69

Figure 1 – A block.7
Figure 2 – Ports .7
Figure 3 – Example of a "unit".8

Table 1 – Managed objects conveying information about the unit.25
Table 2 – Managed objects for block and connector configuration.28
Table 3 – Managed objects for real-time clock information .30
Table 4 – Managed objects for reference clock information.31
Table 5 – Managed objects for software upload .32
Table 6 – Managed objects for scheduled operations.34

---------------------- Page: 9 ----------------------

SIST EN 62379-1:2008
– 4 – 62379-1 © IEC:2007(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
________________

COMMON CONTROL INTERFACE FOR NETWORKED DIGITAL
AUDIO AND VIDEO PRODUCTS –

Part 1: General


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 is 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) and 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 the 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 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 sense. 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 undertake 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 procedure 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 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 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 the 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 62379-1 has been prepared by IEC technical committee 100:
Audio, video and multimedia systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100/1248/FDIS 100/1281/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 10 ----------------------

SIST EN 62379-1:2008
62379-1 © IEC:2007(E) – 5 –
The committee has decided that the contents 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.
A bilingual version of this publication may be issued at a later date.

---------------------- Page: 11 ----------------------

SIST EN 62379-1:2008
– 6 – 62379-1 © IEC:2007(E)
0 Introduction
0.1 Overview
This family of standards specifies a control framework for networked audiovisual equipment.
It provides a means for management entities to control not only transmission across the
network but also other functions within interface equipment.
Although it was originally developed for audio over asynchronous transfer mode (ATM) in
radio broadcasting, the control framework has been extended to encompass video and other
time-critical media, as well as other networking technologies and other applications in both
professional and consumer environments.
The control framework provides a number of key features:
• it provides a consistent interface to the functionality in an audiovisual unit;
• it enables systems to be built that are truly "plug and play", by providing the means for
equipment to discover what units are connected to the network and what their capabilities
are;
• it links discrete areas or blocks of functionality together in a consistent and structured
way;
• it allows us to define small focused building blocks from which more complex functionality
can be built;
• it ensures new functionality can be developed and integrated consistently and easily into
the framework.
The functionality provided by an audiovisual unit is represented using one or more "blocks"
(such as a cross-point switch or a gain control), structured and connected together using the
control framework.
As a further aid to the "plug-and-play" functionality, a common format for audio and video
being conveyed across the network is also specified, to avoid situations in which two pieces
of equipment fail to communicate because there is no format which both support. Equipment
may, of course, also support other formats appropriate to particular applications, and the
standard mechanisms for initiating and terminating communication will work for those formats
in the same way as for the standard formats.
0.2 Structure of the family of standards
IEC 62379 is intended to include the following parts:
Part 1: General
Part 2: Audio
Part 3: Video
Part 4: Data
Part 5: Transmission over networks
Part 6: Packet transfer service
Part 1 specifies aspects which are common to all equipment.
Parts 2 to 4 specify control of internal functions specific to equipment carrying particular types
of media; in the case of Part 4, this would be time-critical media other than audio and video,
for instance, RS232 and RS422 data for applications such as machine control, or the state of

---------------------- Page: 12 ----------------------

SIST EN 62379-1:2008
62379-1 © IEC:2007(E) – 7 –
the “on air” light in a broadcast studio. Part 4 does not refer to packet data such as the control
messages themselves.
Part 5 specifies control of transmission of these media over each individual network
technology, with a separate subpart for each technology. It includes network specific
management interfaces along with network specific control elements that integrate into the
control framework.
Part 6 specifies carriage of control and status messages and non-audiovisual data over
transports that do not support audio and video, such as RS232 serial links, with (as with
Part 5) a separate subpart for each technology.
0.3 Model of the equipment being controlled
0.3.1 Blocks
A piece of equipment (a "unit") is regarded as being composed of functional elements or
"blocks" which may be linked to each other through internal routing.
Blocks may have inputs, outputs and internal functionality. In general, the output of one block
connects to the input of the next block in the processing chain. Blocks can have some
associated control parameters and/or status monitoring accessible via the control framework
management interface.

Inputs Outputs
IEC  1627/07

Figure 1 – A block
A typical block would be a pre-amplifier, which has one input, one output, and a parameter
which sets the gain. Another would be a mixer, with several inputs, one output, and
parameters to select the contribution of each input to the mix; these parameters are
effectively fader settings. A tone generator would have one output and no inputs, and
parameters that set the level, frequency, etc.
There is a special class of blocks called "ports"; ports provide an external connection to other
equipment. An "input port" is one where audio, video, or other data enters the unit and an
"output port" is one where it leaves the unit. Sometimes the port corresponds to a physical
connection, for instance, an XLR socket for analogue audio; sometimes it is a virtual entity
which can be one end of a connection across a network, or one channel on an interface such
as AES10 (MADI) which conveys multiple audio streams.

Input
Output
port
port
IEC  1628/07

Figure 2 – Ports
An input port has no inputs (or rather, no internal inputs; it will have an external input, but that
is not part of the model of the internal structure of the unit) and a single output, which

---------------------- Page: 13 ----------------------

SIST EN 62379-1:2008
– 8 – 62379-1 © IEC:2007(E)
supplies the incoming stream to the inputs of other blocks. In the case of a network port,
parameters would specify the network address; a physical audio port might have parameters
which show the sampling rate and bit depth. Similarly, an output port has a single input and
no (internal) outputs.
Figure 3 shows an example of how the various blocks connect together within a unit. Note that
each input is connected to exactly one output, but an output may be connected to several
inputs, or to none.

Input
Network interface
channel 1
Input Input
channel 2 channel 1
Audio
output 1
Mixer
Audio
Pre-amp
input 1
Audio
output 2
IEC  1629/07

Figure 3 – Example of a "unit"
There is a block which performs a mix between three inputs, two from the network and one
from a physical audio port (or, looking at it another way, two from remote sources and one
from a local source). The local source is connected via a pre-amplifier. The resulting signal is
output locally at output 2 and also transmitted on the network. There is another local output
which carries a copy of one of the remote sources.
The set of available blocks, the connectivity between them, and the parameter settings for
each may be fixed, or changeable by a management terminal, or read-only but changeable by
external factors. Where blocks are implemented in software, a unit may provide the ability for
a management terminal to create and delete them. Where blocks are implemented in physical
hardware, the blocks themselves cannot be changed but it may still be possible for the
management terminal to reprogramme the routing between them.
0.3.2 Control framework
The control framework consists of two lists; a list of blocks (also called control elements), and
a list of connections between them. In both lists, an individual block is identified by a "block
id", which is a number that is different for each block in a unit.
A block's entry in the list of blocks shows what type of block it is, represented by a globally
unique value as described in 0.3 . 5.
Groups of blocks that are connected together are called processing chains. A processing
chain typically represents what a unit does as a whole, so, for instance, a unit that alters the
gain of an input to produce an output would have one simple processing chain that consists of
an input port connected to a gain block which is connected to an output port.

---------------------- Page: 14 ----------------------

SIST EN 62379-1:2008
62379-1 © IEC:2007(E) – 9 –
0.3.3 How the framework helps when designing units
The standard anticipates that many control blocks will be designed and implemented over
time to control the many different sorts of functionality audio and audiovisual units provide.
Units can be built from existing blocks or new ones created as required. It will often be
possible to represent complex, product-specific control functionality using a number of linked
instances of simpler, standard blocks that together provide the functionality required.
0.3.4 How the framework enables "plug and play"
A management terminal simply needs to recognize those blocks that are relevant to the
functions it controls. (The term "management terminal" covers a wide variety of equipment,
from a broadcast control system to the user interface of a device on a home network.)
It can discover what units are present on the network and what functions each contains; it
does not need to recognize the units themselves, only the blocks that describe the
functionality in which it is interested.
The discovery process would be:
• to create a list of the units, beginning with those to which it is directly connected; units can
be uniquely identified by their 48-bit MAC address;
• to retrieve the list of blocks from each device on the list; if any are network ports which
give access to further devices, to add those devices to the list (unless they are already on
it);
• to retrieve the connectivity between any blocks for which it is relevant.
For instance, the user interface to a surround-sound audio system might search for units
containing audio sources, find those for which a processing chain exists that allows them to
be made available to the user, and offer them in a menu. It would also identify functions in the
processing chain such as volume control and play-out controls (pause, rewind, skip track,
etc.).
In a radio broadcast control system, a similar process could be performed when the system is
installed and at any time when equipment is added or replaced. This process would be under
the control of the installer, rather than occurring automatically, but should at least relieve the
installer of the necessity to type in network addresses.
0.3.5 Defining a new type of block
A block's entry in the block list shows what type of block it is, represented by an object
0.4.2) which is a globally unique value that identifies the block type
identifier (OID) (see
definition.
The main requirement when adding a new type of block to the control framework is for its
block type definition to follow the conditions below:
• the globally unique OID identifies a MIB table or group of MIB tables, with each table
containing a variable number of rows.
• the table(s) are indexed using the block id to access control objects associated with
individual instances of this block type.
In effect, the fra
...